Journal articles: 'Roller mixer'

1

YAMAGUCHI, YUJI. "Mixing Method by Combining Banbury-mixer and Roller." NIPPON GOMU KYOKAISHI 71, no. 9 (1998): 578–82. http://dx.doi.org/10.2324/gomu.71.578.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Ujianto, Onny, Margaret Jollands, and Nhol Kao. "Polyethylene/Clay Nanocomposites Prepared in an Internal Mixer: Effect of Processing Variable on Mechanical Properties." Advanced Materials Research 1105 (May 2015): 46–50. http://dx.doi.org/10.4028/www.scientific.net/amr.1105.46.

Full text

Abstract:

Polymer/clay nanocomposites have been explored extensively over the last two decades. Many studies report nanocomposite properties. However, studies on the effect of processing conditions are still limited. This study evaluates the effect of rotor type, rotor rotation (rpm) and mixing time on mechanical properties of polyethylene organoclay composites. Samples were fabricated using two different rotors; roller and Banbury, in an internal batch mixer at various mixing conditions. The analysis shows that the Banbury rotor improved mechanical properties more than the roller rotor. Shear and diffusion mechanism, as well as material degradation, were the controlling factors at different processing conditions.

APA, Harvard, Vancouver, ISO, and other styles

3

Smyksy, K., R. Wrona, and E. Ziółkowski. "Comparative Analysis of Power Measurement Results in the Testing of Sand Mixers." Archives of Foundry Engineering 13, no. 3 (September 1, 2013): 119–22. http://dx.doi.org/10.2478/afe-2013-0072.

Full text

Abstract:

Abstract Investigations of operating parameters of widely used sand mixers reveal a wide variability range in the values of parameters associated with their power demand. Power efficiency of manufacturing processes has received a great deal of attention lately, which encourages the research efforts to optimise this aspects of operation of machines and installations as well. In the first place these machines and installations have to work properly as a part of the process line- which applies also to moulding sand mixers. Experiments conducted by the authors suggest that the same goal can be achieved at variable energy input levels. To obtain information about the power demands of sand mixers requires the use of highly specialised equipment, methodology and result processing procedures. This study provides a brief characteristic of measurement equipment and results of measurements taken on a unit AG-015 (based on a roller mixer) and a laboratory rotor mixer.

APA, Harvard, Vancouver, ISO, and other styles

4

ARAL, HALE, and MURAT USTA. "Influence of using a roller mixer on rejected samples in coagulation tests." International Journal of Laboratory Hematology 33, no. 6 (May 16, 2011): 617–19. http://dx.doi.org/10.1111/j.1751-553x.2011.01334.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Tian, Fuyang, Yuhua Chen, Zhanhua Song, Yinfa Yan, Li Fade, Zhonghua Wang, and Benhai Xiong. "Finite Element Simulation and Performance Test of Loading and Mixing Characteristics of Self-Propelled Total Mixed Ration Mixer." Journal of Engineering 2020 (March 13, 2020): 1–15. http://dx.doi.org/10.1155/2020/6875816.

Full text

Abstract:

Simulation analysis and parameter optimization are performed for the loading and mixing devices of a self-propelled total mixed ration mixer. To reveal the three-dimensional movement of silage material under the action of the loading cutter roller, the latter is modeled using SolidWorks software. ANSYS/LS-DYNA software is used to simulate the process of silage cutting, which is modeled using smoothed particle hydrodynamics coupled with the finite element method. The cutting force and power consumption are simulated, and the behavior of the equivalent strain of the silage is determined. The results showed that silage was broken up mainly by extrusion and shear force due to the loading cutter roller. The power consumption according to the simulation is consistent with the value from an empirical formula, confirming the validity of the proposed modeling method. To study the mixing performance and obtain the optimum parameters of the mixing device, the Hertz–Mindlin model is used for the interaction between material particles and mixing device. A three-factor, five-level method is used to optimize the mixing performance. Material-mixing time, loading rate, and auger speed are chosen as experimental factors and mixed uniformity as an evaluation index. It is found that auger speed and material mixing time have significant effects on mixing uniformity. These results provide reference values allowing the analysis of the crushing of silage and selection of the optimum parameters for mixing performance.

APA, Harvard, Vancouver, ISO, and other styles

6

Tang, Van Lam, Boris Igorevich Bulgakov, and Olga Vladimirovna Aleksandrova. "DETERMINATION OF ADHESIVE STRENGTH LAYER’S ROLLER COMPACTED CONCRETE THE METHOD AXIAL EXTENSION." Vestnik MGSU, no. 6 (June 2017): 647–53. http://dx.doi.org/10.22227/1997-0935.2017.6.647-653.

Full text

Abstract:

Roller compacted concrete for the construction of hydraulic and hydroelectric buildings is a composite material, which consists of a binder, fine aggregate (sand), coarse aggregate (gravel or crushed stone), water and special additives that provide the desired concrete workability and impart the required concrete performance properties. Concrete mixture is prepared at from concrete mixing plants strictly metered quantities of cement, water, additives and graded aggregates, whereupon they are delivered to the site laying Mixer Truck and sealing layers with each stack layer. The advantages of roller compaction technology should include the reduction of construction time, which allows fast commissioning construction projects, as well as reduce the amount of investment required. One of the main problems encountered in the process of roller compaction of the concrete mix is the need to provide the required adhesion strength between layers of concrete. This paper presents a method for determining the strength of adhesion between the concrete layers of different ages roller compacted concrete using axial tension. This method makes it possible to obtain objective and accurate results with a total thickness of layers of compacted concrete of up to 300…400 mm. Results from this method, studies have shown that the value of strength between the concrete layers in addition to the composition of the concrete and adhesion depends on the quality and the parallel end surfaces of the cylinder-models, which are mounted steel plates for axial tension, as well as the state of the contact surfaces of the concrete layer. The method can be used to determine the strength of interlayer adhesion in roller compacted concrete, which are used in the construction of dams and other hydraulic structures.

APA, Harvard, Vancouver, ISO, and other styles

7

Harman, Harman, and Edi Rande Padang. "Perancangan Mesin Mixer Campuran Batako Dan Paving Block Tipe Vertikal Untuk Usaha Kecil Dan Menengah." Equivalent Jurnal Ilmiah Sosial Teknologi 4, no. 1 (February 5, 2022): 31–38. http://dx.doi.org/10.46799/jequi.v4i1.67.

Full text

Abstract:

Mesin mixer campuran batako dan paving block merupakan suatu alat yang digunakan untuk membantu proses pencampuran antara semen, pasir dan air. Mesin ini dibuat dengan tujuan untuk membantu para pekerja ataupun masyarakat dalam proses pencampuran bahan-bahan material batako dan paving block yang biasanya dilakukan secara manual. Metode penelitian dilakukan dalam beberapa tahap yaitu studi pustaka dan studi lapangan. Tahap perancangan terdiri dari indentifikasi masalah, membuat konsep rancangan seperti desain rancangan, perhitungan elemen mesin dan gambar kerja. Komponen mesin yang digunakan dalam rancangan adalah sistem penggeraknya menggunakan motor diesel, pulley and belt, gearbox, coupling flange, channel L, Roller ball bearing, wadah silinder dan poros pengaduk. Wadah tempat pengaduk berupa silinder dirancang dan dibuat dengan pemilihan menggunakan bahan pelat baja dengan tebal 5 mm. Diameter wadah silinder ini adalah 1200 mm tinggi tabung 400 mm. Selain itu empat buah sistem pengaduk secara mekanis dirancang dan dibuat, selanjutnya pengaduk ini bekerja dengan metode rotasi atau gerak putar. Poros pemutar dan empat buah pelat pengaduk dirancang dan ditempatkan didalam silinder berfungsi sebagai pengaduk mekanis material. Hasil yang didapat dari rancangan mesin mixer campuran batako dan paving block tipe vertikal berupa desain rancangan dan gambar kerja mesin mixer

APA, Harvard, Vancouver, ISO, and other styles

8

Liu, Ning Chang, and Zhao Feng Li. "One High Efficiency Production Line of Clinker and Slag Grinding Separately by Roller Mill in Cement Industry." Advanced Materials Research 58 (October 2008): 83–89. http://dx.doi.org/10.4028/www.scientific.net/amr.58.83.

Full text

Abstract:

In cement industry, many grinding up systems are on operating now. The tradition process of tube mill grinding system is high energy consumption, so it’s low efficiency, especially in the final cement grinding process. The value and advantage of slag is recognized more and more, but it’s difficult to be grinded up. Furthermore, the disadvantage and shortages to grind up clinker compounded with slag to produce cement are obvious and adopted. The best process is to grind up slag, clinker separately. Then, these two kinds of powder are compounded by a mixer. Hereby, it introduces a design of the process to grind up clinker, slag by one roller mill.

APA, Harvard, Vancouver, ISO, and other styles

9

Ahmed Salahudeen, Shafaat, Rabeh H. Elleithy, Othman AlOthman, and S. M. AlZahrani. "Comparative study of internal batch mixer such as cam, banbury and roller: Numerical simulation and experimental verification." Chemical Engineering Science 66, no. 12 (June 2011): 2502–11. http://dx.doi.org/10.1016/j.ces.2011.02.017.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Liu, Jian Ping, Xia Song, Wei Yuan, and Xiao Yan Wang. "Evaluation of the Thermal Stabilization Effect of Maleic Anhydride Derivatives on Polyvinyl Chloride." Advanced Materials Research 535-537 (June 2012): 1167–70. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.1167.

Full text

Abstract:

Here, we synthesized a series of polymeric thermal stabilizers for polyvinyl chloride (PVC) based on maleic anhydride derivatives, including N-phenylmaleimide (NPMI), N-p-chlorophenyl maleimide (NCIPMI), N-p-nitrophenyl maleimide (NNOPMI), dibutyltin maleate (DBTM) and dioctyltin maleate (DOTM). Five specimens were prepared by mixing and rolling through a blending machine and a double-roller mixer, respectively. These samples were first subjected to thermal degradation in a 180°C hot oven, and fractions were collected every 10 min, followed by spotting on a slip of test paper. From the degree of color change in the test paper, the influences of these compounds on the thermal stability of PVC were estimated and such mechanisms were also discussed.

APA, Harvard, Vancouver, ISO, and other styles

11

Mahdavi, Alireza, Abolfazl Mohammadzadeh Moghaddam, and Mohammad Dareyni. "Durability and Mechanical Properties of Roller Compacted Concrete Containing Coarse Reclaimed Asphalt Pavement." Baltic Journal of Road and Bridge Engineering 16, no. 3 (September 29, 2021): 82–110. http://dx.doi.org/10.7250/bjrbe.2021-16.533.

Full text

Abstract:

The feasibility of utilizing Reclaimed Asphalt Pavement (RAP) as a replacement for coarse aggregates in Roller Compacted Concretes (RCCs) was assessed. This replacement was performed in different volumetric percentages (25%, 50%, 75%, and 100%). During this process, RAP materials were subject to abrasion and impact in the Los Angeles drum and mixer before being added to the mixture. Compressive strength, splitting tensile strength, flexural strength, crack propagation, Ultrasonic Pulse Velocity (UPV), electrical resistivity, density, and water absorption (in 7, 28, and 90 days of age) tests were done on all mixtures. Results show that utilizing RAP in RCC can cause a drop in the mechanical properties, but it has positive effects on crack propagation of the specimens due to their increased toughness. Increasing the amount of RAP in the mixtures has increased their electrical resistivity, likely owing to the hydrophobic properties of RAP, which causes prevention from connecting pores to each other. The relationship between the mechanical properties and UPV of the mixtures was analysed using regression models. Moreover, one- and two-way ANOVA (analysis of variance) tests were performed on the results at a 95% confidence level. Finally, replacing the coarse aggregates with RAP only up to 75% is suggested if pre-processing is performed.

APA, Harvard, Vancouver, ISO, and other styles

12

Sulong, Nurulsaidatulsyida, and Anika Zafiah M. Rus. "Morphology and Mechanical Properties of HDPE/Bio-Polymer as Compounding Materials." Advanced Materials Research 748 (August 2013): 150–54. http://dx.doi.org/10.4028/www.scientific.net/amr.748.150.

Full text

Abstract:

The effect of bio-polymer as compounding material in mechanical properties of HDPE is described in this study. 10% of bio-polymer was added to the HDPE and then mixed by using Brabender Plastograph machine using mixer and roller screw and then test specimens were prepared by injection moulding. The origin bio-polymer (VOP), HDPE and the compounding bio-polymer/ HDPE (CDM) were compared by using tensile test and the microstructure was investigated through scanning electron microscopy (SEM) for the fractured surface of the samples. The tensile strength of CDM was found to increase that is 17.47 MPa compared to pure VOP that only 5.69 MPa while pure HDPE has the highest tensile strength that is 20.98 MPa. By adding 10% bio-polymer to the HDPE was increased up the strength at about 207.16% while pure HDPE produced 268.91% increment with VOP as the precursor. SEM of the VOP produced brittle fracture surface while CDM have brittle and ductile surface and HDPE has totally ductile surface with highest plastic deformation properties of all.

APA, Harvard, Vancouver, ISO, and other styles

13

Rus, Anika Zafiah Mohd, and Nurulsaidatulsyida Sulong. "Fundamental Technique of Pre-Blending of Bio-Matrix with Commercial HDPE." Applied Mechanics and Materials 393 (September 2013): 121–25. http://dx.doi.org/10.4028/www.scientific.net/amm.393.121.

Full text

Abstract:

The effect of bio-polymer as bio-matrix material with HDPE for the blending process is described in this study. 10%, 20%, 30%, 40% and 50% of bio-polymer was added to the HDPE and then blended by using Brabender Plastograph machine using mixer and roller screw and the test specimens were prepared by injection moulding. The compatibility of the origin bio-polymer (VOP), HDPE and the bio-matrix of bio-polymer/ HDPE (BioPE) were observed during the injection moulding process. Dumbbell shape of tensile test specimens were produced according to ISO 527-2 (5A) from the injection moulding process. Mixing process was successfully conducted based on two different matrix which is lab scale bio-polymer and production of commercial thermoplastic materials.

APA, Harvard, Vancouver, ISO, and other styles

14

Liu, Jian Ping, Hong Zhou Shang, Xia Song, Wei Yuan, and Shu Mei Zhou. "Evaluation of the Thermal Stabilization Effect of the Bis (Mercaptoethanol Oleate) Dimethyl Tin on Polyvinyl Chloride." Advanced Materials Research 581-582 (October 2012): 81–84. http://dx.doi.org/10.4028/www.scientific.net/amr.581-582.81.

Full text

Abstract:

Bis (mercaptoethanol oleate) dimethyl tin was synthesized and added to polyvinyl chloride (PVC) with various ratios. Specimens were prepared by mixing and rolling through a double-roller mixer, and their static thermal stabilities were estimated by the oven static thermal aging experiments. The influence of the bis (mercaptoethanol oleate) dimethyl tin on the dynamic thermal stability of PVC was tested through a haack torque rheometer (HAAKE PolyLab QC). The tensile strength and rate of elongation at break of the PVC specimens were evaluated by a servo-controlled tensile testing machine. The results show that the bis (mercaptoethanol oleate) dimethyl tin has excellent static and dynamic thermal stabilization effect on PVC, and to some extent, can improve the breaking elongation rate the PVC sample.

APA, Harvard, Vancouver, ISO, and other styles

15

Dyas, Amalia Varyezqa, Gerard Aponno, and Armin Naibaho. "ANALISIS PENAMBAHAN PASIR DAN SEMEN TERHADAP NILAI CBR TANAH DASAR DESA SUKODADI KABUPATEN LAMONGAN." Jurnal JOS-MRK 2, no. 3 (September 20, 2021): 261–66. http://dx.doi.org/10.55404/jos-mrk.2021.02.03.261-266.

Full text

Abstract:

Soil is a factor that can affect the structure of road construction. The CBR value is one of the parameters to determine the bearing capacity of the soil, if the CBR value is high then the soil bearing capacity is good, while if the CBR value is low then the soil needs to be stabilized. The purpose of this thesis is to determine the characteristics of the soil, determine the CBR value of the soil before and after stabilization, develop an implementation method and budget plan for the stabilized earthwork. This research includes water content test, density test, specific gravity test, grain analysis with hydrometer, limit Atterberg test, compaction test (modified), and CBR test (modified, soaked-unsoaked). In this test, variations of the addition of sand and cement were 5%, 10%, 15%, 20%, and 25% of the dry weight of the soil, respectively. From the test results, showing soil classification according to AASHTO A-7-6 with a value of soaked CBR 2.98%. Variations addition of sand and cement by 5% is used as a soil stabilization with the value of soaked CBR 26.31%. Stabilization work using Soil Stabilizer/Pulvi Mixer, Watertank Truck, Motor Grader, Vibro Roller, Sheepfoot Roller, Dump Truck, etc. with a Budget Plan of IDR. 6,505,291,980 (Six Billions Five Hundred Five Millions Two Hundred Ninety One Thousands Nine Hundred Eighty Indonesian Rupiahs) .

APA, Harvard, Vancouver, ISO, and other styles

16

Agung, E. H., M. H. M. Hamdan, Januar Parlaungan Siregar, D. Bachtiar, C. Tezara, and J. Jamiluddin. "Water Absorption Behaviour and Mechanical Performance of Pineapple Leaf Fibre Reinforced Polylactic Acid Composites." International Journal of Automotive and Mechanical Engineering 15, no. 4 (December 24, 2018): 5760–74. http://dx.doi.org/10.15282/ijame.15.4.2018.4.0441.

Full text

Abstract:

Fast-growing scientific work is focusing on alternative sources to replace modern synthetic fibre materials due to the adverse effects caused by petroleum-based materials. Natural fibre possesses high potential as a replacement for synthetic fibre and petroleum-based products. These materials are not only greener and environmental-friendly, but also safe for human health. As such, this study investigated the influence of compatibilising agent of maleated anhydride polyethylene (MAPE) on mechanical performance of pineapple leaf fibre (PALF) reinforced polylactic acid (PLA). The raw materials, such as PALF, PLA, and MAPE, were mixed by using a hot roller mixer machine and hot compression moulding at 190ºC. The specimens were then tested for water absorption and flexibility. The specimens were submerged in water for 0, 7, 14, and 21 days. Three types of tests were conducted, namely water absorption, tensile, and flexural assessments. The results of water absorption, tensile, and flexural tests for the untreated PALF composite (UPALF) and treated PLAF composite (TPALF) were recorded and explained. As a conclusion, composite materials based on hydrophilic natural fibre may reduce the tensile and flexural properties of the composite.

APA, Harvard, Vancouver, ISO, and other styles

17

Ruggiero, E., MM Reboredo, and MS Castro. "Structural and dielectric properties of hot-pressed poly(vinylidene fluoride)-based composites." Journal of Composite Materials 52, no. 10 (August 3, 2017): 1399–412. http://dx.doi.org/10.1177/0021998317723967.

Full text

Abstract:

The characterization of ceramic/polymer composites was performed on zinc oxide/poly(vinylidene fluoride) – ZnO/PVDF and barium titanate/poly(vinylidene fluoride) composites with varying filler concentration in order to evaluate the main interactions responsible for the composite dielectric behavior. The materials, poly(vinylidene fluoride) and its composites, were melt-blended using a two-roller mixer and then hot-pressed. The permittivity of composites was enhanced compared with that of the pure poly(vinylidene fluoride) with the addition of 20 w/w% of ZnO particles. However, samples with 40 or 60 w/w% of ZnO registered a diminution in the real permittivity values which was connected to particle-matrix adhesion problems. On the other hand, barium titanate composites presented a more homogeneous morphology with less presence of voids and a better adhesion between the filler and the polymer, where real permittivity increased with the addition of barium titanate particles.

APA, Harvard, Vancouver, ISO, and other styles

18

Ogale, Nikita, and Komal Kamble. "Preparation and Characterization of Different Types of Extruders and Its Techniques." Asian Journal of Pharmaceutical Research and Development 9, no. 3 (June 15, 2021): 48–51. http://dx.doi.org/10.22270/ajprd.v9i3.929.

Full text

Abstract:

The study on characterization of different types of extruder such as single screw cone type, axial type extruder, radial type extruder, die roller type extruder from excipient, enzyme and silica has been performed. The primary goal of the project focuses on making pellets from MCC+LACTOSE, MCC+STARCH, Enzyme and Silica. The process is extremely encouraged in several pharmaceutical industries. The below article will help us understand various aspects of techniques used in the extrusion of pellets. The extruder process of pellets are mainly mixing and extrusion. We will also discuss about the several factors that might influence the pellet quality which includes formulation - granulating liquid, excipients; Equipment (Rapid mixer granulator, various type of extruder, and size of extrusion screen) and process (Extrusion speed, extrusion time). The characterization of the pellets includes estimation of various parameters such as moisture content ,appearance, shape , bulk density, disintegration of the pellets are explained.

APA, Harvard, Vancouver, ISO, and other styles

19

Ruth, Byron E., and Mang Tia. "Aggregate Degradation Testing by Gyratory Testing Machine." Transportation Research Record: Journal of the Transportation Research Board 1619, no. 1 (January 1998): 3–10. http://dx.doi.org/10.3141/1619-01.

Full text

Abstract:

The Gyratory Testing Machine (GTM) equipped with an air roller was used to investigate the dry and wet degradation of six aggregates. Three gradings similar to those for the Los Angeles (LA) abrasion test were evaluated in the GTM by using 25, 50, 100, and 200 revolutions. The test data indicated substantial differences in gradation of the aggregates after testing. Type and initial size of the aggregate influenced the amount and characteristics of degradation. Regression analyses of the data resulted in the development of GTM degradation prediction equations using the LA abrasion loss. The most important goal for the GTM test results was to define gradation and the effect of moisture, instead of using only a relative indicator such as LA abrasion loss. Four aggregate blends were tested in the GTM to simulate degradation produced in handling and processing of aggregate through a drum mixer and drum dryer. These test results duplicated some of the gradations obtained after the material had passed through the drum.

APA, Harvard, Vancouver, ISO, and other styles

20

Kaewkabpet, Densak, Charoen Nakason, Azizon Kaesaman, and Anoma Thitithammawong. "Changes in Mixing Torque, Mechanical and Dynamic Rheological Properties of Epoxidized Natural Rubber and Copolyester Blends as Affected by Epoxidized Natural Rubber Contents." Advanced Materials Research 844 (November 2013): 69–72. http://dx.doi.org/10.4028/www.scientific.net/amr.844.69.

Full text

Abstract:

Thermoplastic natural rubber (TPNR) based on epoxidized natural rubber with 30 %mol epoxide (ENR-30) and copolyester (COPE) blends was prepared in a molten state by using roller rotor internal mixer. Effect of various ENR contents on mixing torque together with mechanical and dynamic properties of the ENR-30/COPE blends was investigated. It was found that the mixing torque and complex viscosity increased with increasing contents of the ENR in the blends. This was due to higher polarity the ENR molecules caused interaction and entanglement of the ENR molecular chains with higher viscosity. Furthermore, improvement of elastomeric properties of the ENR-30/COPE blends was clearly observed, especially in the blends with higher proportion of the ENR. These improved elastomeric properties with high elongation at break, low tension set and high storage modulus together with low tan δ. This observation correlated to higher elastic component in the blend caused promoting higher elastic response in combination with increasing of interaction between the ENR and the COPE phases.

APA, Harvard, Vancouver, ISO, and other styles

21

Wang, Jihu, and Dajun Chen. "Mechanical Properties of Natural Rubber Nanocomposites Filled with Thermally Treated Attapulgite." Journal of Nanomaterials 2013 (2013): 1–11. http://dx.doi.org/10.1155/2013/496584.

Full text

Abstract:

Natural rubber (NR) nanocomposites were prepared in a double-roller plasticator mixer with purified attapulgite (PAT) or modified attapulgite, which was treated at 450°C (PAT-450) and 850°C (PAT-850) for two hours. The structures of the pristine, purified, and modified attapulgite were characterized by FTIR, TEM, XRD, and BET. The results indicated that the structure of attapulgite changed with the increased temperature. The effects of the PAT treatment and content on the mechanical properties of the NR nanocomposites were also investigated. The results showed that AT increased curing process of natural rubber. A significant improvement in the tensile strength, wearability, and solvent resistance of the nanocomposites was observed with the addition of different types of attapulgite as compared to those of pure NR. Scanning electron microscope images showed that the filler was located at the interface, which induced compatibilization in the immiscible blends. Thermogravimetric analysis revealed a significant improvement in the thermal stability of the NR/PAT nanocomposites.

APA, Harvard, Vancouver, ISO, and other styles

22

Begum, K., M. A. Islam, and M. M. Huque. "Investigation on the Tensile and Flexural Properties of Coir-fibre-reinforced Polypropylene Composites." Journal of Scientific Research 7, no. 3 (September 1, 2015): 97–111. http://dx.doi.org/10.3329/jsr.v7i3.23075.

Full text

Abstract:

The utilization of natural fibres as reinforcement in polymer composites has been increased significantly for their lightweight, low cost, high specific strength, modulus and biodegradable characteristic. In this present work, the mechanical properties of randomly distributed short coir-fibre-reinforced polypropylene (PP) composites have been studied as a function of fibre loading. In order to improve the composites mechanical properties, raw coir fibres were treated with 1% alkali (NaOH) solution. Both raw and alkali treated coir-fibre-reinforced PP composites were prepared with different fibre loadings (10, 15, 20, 25, 30 and 35 wt%) using a double roller open mixer machine and injection molding machine. The mechanical properties, such as tensile strength (TS), tensile modulus (TM), flexural strength (FS) and flexural modulus (FM) were investigated for the prepared composites. The alkali treated coir-fibre-reinforced PP composites showed better results in mechanical properties compared to untreated composites. Finally, the optical microscopic studies were carried out on fractured surfaces of the tensile test specimens, which indicated weak interfacial bonding between the fibre and the polymer.

APA, Harvard, Vancouver, ISO, and other styles

23

Sedegui, Mohamed (Sid), and Nancy K. Osterbauer. "Evaluation of a High-Throughput Protocol for Detecting Blueberry shock virus in Vaccinium Using ELISA." Plant Health Progress 10, no. 1 (January 2009): 13. http://dx.doi.org/10.1094/php-2009-0710-01-rs.

Full text

Abstract:

The Oregon Department of Agriculture's official virus testing program for Vaccinium has grown 915% since its inception. To address this increased workload, we evaluated a high-throughput ELISA protocol that uses a 96-well format for sap extraction. To verify the efficacy of the protocol, it was used to test leaves from known infected and healthy plants (positive and negative controls) and from 940 Vaccinium plants grown in a nursery with Blueberry shock virus (BlShV) problems. Each leaf collected was cut in half; one-half was macerated in an extraction buffer using mesh sample bags and a roller press (standard protocol) and the other half was placed into 10 × 96 collection microtubes and macerated in the extraction buffer using a Mixer Mill MM300 (high-throughput protocol). All sample sap extractions were then tested with a commercial ELISA kit. In experiments with the BlShV positive and negative control plants, the high-throughput protocol had high sensitivity (100%) and specificity (100%), matching the standard protocol. In experiments with the blueberry plants of unknown BlShV infection status, the high-throughput protocol had a sensitivity of 94.85% and a specificity of 96.70%, compared to the standard protocol. It is concluded the high-throughput protocol can be used successfully with ELISA to detect BlShV in Accepted for publication 17 May 2009. Published 10 July 2009. Accepted for publication 17 May 2009. Published 10 July 2009.

APA, Harvard, Vancouver, ISO, and other styles

24

Foudzi, Farhana Mohd, Norhamidi Muhamad, Abu Bakar Sulong, and Hafizawati Zakaria. "Flow Behavior Characteristic for Injection Process Using Nano-Yttria Stabilized Zirconia for Micro Metal Injection Molding (µMIM)." Applied Mechanics and Materials 44-47 (December 2010): 480–84. http://dx.doi.org/10.4028/www.scientific.net/amm.44-47.480.

Full text

Abstract:

Micro metal injection molding (µMIM) prior to conventional plastic injection molding (PIM) has become widely demanding due to its smaller size, more complex geometric surface and time consuming on its product. Metal and ceramic in powder form of various sizes up to µm is mixed with binder system to produce products that meet the requirements. Nano size yttria stabilized zirconia (YSZ) with average particle size of 25nm, was tested both physically and mechanically for its properties before mixing and injection process using several testing such as Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX), pycnometer density, critical powder volume percentage (CPVP) and rheology respectively. Grain shape for YSZ particle is near spherical with the diameter range between 21.2 – 33.5nm while the CPVP shows the highest powder loading was 41.4%. Binder system of 70% palm stearin and 30% polypropylene (PP) was then mixed with YSZ at 37%, 38% and 39% by using internal mixer with roller blade type. By using CPVP of 41.4% as the guideline, mixing was done beyond the critical point until it is capable of becoming the dough mixture and was found that 43% powder loading is the highest loading it can achieved. This dough form of every mixture of powder loading was crushed to obtain pellet size as the feedstock. Rheology test was carried out for each powder loading at 180oC, 190oC and 200oC with the load increasing from 10N to 20N to determine the plastic behavior and best relationship between viscosity (Pa.s) and shear rate (1/s). Dilatant flow behavior for all the powder loadings and smooth data distribution during testing at 180oC was observed respectively. Critical parameters involving in injection process such as mold temperature (oC), melt temperature (oC), pressure (bar) and time (s) was manipulated for every powder loading to obtain the best result with no defects such as shot and flashing. Each critical parameter increased gradually as the powder loading (%) increased. Debinding and sintering process will be carried out to determine the strength and toughness by using micro hardness and micro tensile test respectively.

APA, Harvard, Vancouver, ISO, and other styles

25

Halim, A. O. Abd El, A. G. Razaqpur, and A. H. El Kashef. "Effects of construction cracks on the design of asphalt pavements." Canadian Journal of Civil Engineering 21, no. 3 (June 1, 1994): 410–18. http://dx.doi.org/10.1139/l94-045.

Full text

Abstract:

Compaction of asphalt mix has been recognized as one of the most important factors that affect the long-term performance of the pavement. Problems experienced in compacting asphalt mixes have generally been ascribed to the mix. Roller "checking," the result of compaction with steel rollers, has been disregarded or considered as irrelevant. Compaction based on a new concept, using a soft plate, avoids roller checking, as demonstrated by a series of side-by-side field tests with steel and pneumatic rollers. The surface cracks initiated by the steel wheel roller may provide an explanation for the often reported phenomenon of early deterioration of asphalt pavements. Finite element analyses of pavement structures with roller-induced cracks have shown significantly higher tensile stresses than the corresponding stresses in otherwise identical uncracked pavements. The analytical findings are supported by indirect tensile and stress fatigue tests results obtained in the laboratory from asphalt samples compacted in the field. The test samples were recovered from pavements compacted either by existing compaction equipment and technique or by the new soft plate method. Key words: asphalt, crack, compaction, fatigue, finite element, tensile strength testing, pavement.

APA, Harvard, Vancouver, ISO, and other styles

26

Xie, Hai Bo, Zheng Yi Jiang, Yan Bing Du, Dong Bin Wei, and A. Kiet Tieu. "Analysis of Surface Roughness of Low Carbon Steel during Cold Rolling of Thin Strip." Advanced Materials Research 76-78 (June 2009): 544–47. http://dx.doi.org/10.4028/www.scientific.net/amr.76-78.544.

Full text

Abstract:

Surface roughness plays an important role in determining the tribological behaviour of mechanical components (e.g. gears and roller bearings etc.) under full-film and mixed (or partial) elastohydrodynamic lubrication conditions. This paper describes a detailed mechanics analysis of the surface roughness transformation of thin strip which has been cold rolled on an experimental mill. Low carbon steel strips were rolled at various speeds and reductions, and the effects of rolling parameters on surface roughness are studied. The results of surface roughness can provide important information to optimise the rolling schedule and to improve the rolled strip quality.

APA, Harvard, Vancouver, ISO, and other styles

27

Cao, Wei, Jiaxu Wang, Wei Pu, Ying Zhang, Jiqiang Wu, Si Ren, and Jianbing Long. "The effect of round corner on lubrication of high speed cylindrical roller bearings considering skidding." Industrial Lubrication and Tribology 69, no. 6 (November 13, 2017): 833–43. http://dx.doi.org/10.1108/ilt-03-2016-0055.

Full text

Abstract:

Purpose Previous studies were mainly focused on profile designation of bearing rollers and lubrication performance without considering roller-races skidding. However, the width of round corner, load, rotational speed and some other parameters have significant effects on the roller-races sliding speed. This paper aims to investigate the effect of round corner on lubricating characteristics between the heavily loaded roller and inner race considering skidding and roughness. Design/methodology/approach A mixed elastohydrodynamic lubrication (EHL) model which is capable of handling practical cases with 3D machined roughness is combined with the skidding model to investigate the effect of round corner on lubricating characteristics between the heavily loaded roller and inner race. Findings The width of round corner and round corner radius have a desirable range under certain operating condition, within which the maximum pressure, stress and maximum flash temperature remain low. The optimized range is sensitive to the operating condition. Roughness and skidding narrow the optimized range of round corner radius. Roughness increases the pressure peak, Mises stress and friction coefficient. At the same time, skidding and roughness have obvious effects on film thickness at the contact center area if the round radius is small. Research limitations/implications This paper uses the Harris skidding model that has a relatively bigger error, which is not accurate if the bearing load is less. Practical implications This paper unifies the skidding model and mixed EHL model which can be used as a tool for optimization design and lubricating performance analysis of cylindrical roller bearing. Originality/value Lubrication analyses for roller bearing are assumed to be pure rolling contact between roller and races in a previous study, which could not reflect the real contact characteristics. The skidding model is merged into a mixed EHL model which can be used as a dynamic tool to analyze the lubricating performance considering the round corner, skidding and roughness.

APA, Harvard, Vancouver, ISO, and other styles

28

Olofsson, Ulf, Hans Sjo¨stro¨m, and Ulf Sjo¨din. "Increased Wear Resistance of Roller Bearings Using Me-C: H Coated Rollers." Journal of Tribology 122, no. 4 (May 8, 2000): 682–88. http://dx.doi.org/10.1115/1.1310559.

Full text

Abstract:

The contact surfaces in a boundary lubricated spherical roller thrust bearing can change form due to sliding and particle generated wear. These form changes can seriously reduce the fatigue life of the bearings. An experimental test series has been performed where this effect was investigated in bearings with metal mixed amorphous carbon, Me-C: H, coated rollers that were tested against bearings with standard rollers. The experimental results show that while the bearings with standard rollers can fail due to wear, the bearings with coated rollers are at the same time almost unaffected by wear. Also the number of particles generated in the contact was significantly less when using coated rollers. There were twice as many self-generated particles when using a standard bearing compared with a coated bearing. The effect of the coating is discussed in terms of surface hardness, coefficient of friction and tribochemical phenomena. [S0742-4787(00)02004-X]

APA, Harvard, Vancouver, ISO, and other styles

29

Kamińska, J., and J. Dańko. "Preliminary Research on Granulation Process of Dust Waste from Reclamation Process of Moulding Sands with Furan Resin." Archives of Foundry Engineering 12, no. 3 (September 1, 2012): 53–58. http://dx.doi.org/10.2478/v10266-012-0081-2.

Full text

Abstract:

Abstract The results of investigations of the granulation process of foundry dusts generated in the dry mechanical reclamation process of used sands, where furan resins were binders are presented in the paper. Investigations concerned producing of granules of the determined dimensions and strength parameters. Granules were formed from the dusts mixture consisting in 50 mass% of dusts obtained after the reclamation of the furane sands and in 50 mass % of dusts from sands with bentonite. Dusts from the bentonite sands with water were used as a binder allowing the granulation of after reclamation dusts from the furane sands. The following parameters of the ready final product were determined: moisture content (W), shatter test of granules (Wz) performed directly after the granulation process and after 1, 3, 5, 10 days and nights of seasoning, water-resistance of granules after 24 hours of being immersed in water, surface porosity ep and volumetric porosity ev. In addition the shatter test and water-resistance of granulate dried at a temperature of 105°C were determined. Investigations were performed at the bowl angle of inclination 45°, for three rotational speeds of the bowl being: 10, 15, 20 rpm. For the speed of 10 rpm the granulation tests of dusts mixture after the preliminary mixing in the roller mixer and with the addition of water-glass in the amount of 2% in relation to the amount of dust were carried out. The obtained results indicate that the granulator allows to obtain granules from dusts originated from the reclamations of moulding sands with the furane resin with an addition of dusts from the bentonite sands processing plants.

APA, Harvard, Vancouver, ISO, and other styles

30

Alakhramsing, Shivam S., Matthijn B. de Rooij, Mark van Drogen, and Dirk J. Schipper. "The influence of stick–slip transitions in mixed-friction predictions of heavily loaded cam–roller contacts." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, no. 5 (July 26, 2018): 676–91. http://dx.doi.org/10.1177/1350650118789515.

Full text

Abstract:

A load-sharing-based mixed lubrication model, applicable to cam–roller contacts, is developed. Roller slippage is taken into account by means of a roller friction model. Roughness effects in the dry asperity contact component of the mixed lubrication model are taken into account by measuring the real surface topography. The proportion of normal and tangential load due to asperity interaction is obtained from a dry contact stick–slip solver. Lubrication conditions in a cam–roller follower unit, as part of the fuel injection equipment in a heavy-duty diesel engine, are analyzed. Main findings are that stick–slip transitions (or variable asperity contact friction coefficient) are of crucial importance in regions of the cam where the acting contact forces are very high. The contact forces are directly related to the sliding velocity/roller slippage at the cam–roller contact and thus also to the static friction mechanism of asperity interactions. Assuming a constant asperity contact friction coefficient (or assuming that gross sliding has already occurred) in highly loaded regions may lead to large overestimation in the minimal required cam–roller contact friction coefficient in order to keep the roller rolling. The importance of including stick–slip transitions into the mixed lubrication model for the cam–roller contact is amplified with decreasing cam rotational velocity.

APA, Harvard, Vancouver, ISO, and other styles

31

Xie, Zhijie, Qihe Xue, Jiqiang Wu, Le Gu, Liqin Wang, and Baoyu Song. "Mixed-lubrication analysis of planetary roller screw." Tribology International 140 (December 2019): 105883. http://dx.doi.org/10.1016/j.triboint.2019.105883.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Сенибабнов, С. А., К. А. Андрианов, and А. Ф. Зубков. "Method of Development of Technology for the Device of Road Structures Using Asphalt Granulate." НАУЧНЫЙ ЖУРНАЛ СТРОИТЕЛЬСТВА И АРХИТЕКТУРЫ, no. 2(58) (September 17, 2020): 84–99. http://dx.doi.org/10.36622/vstu.2020.58.2.007.

Full text

Abstract:

Постановка задачи. Используемые в настоящее время отходы (асфальтогранулят) при фрезеровании покрытий нежесткого типа отличаются по своим характеристикам от горячих и холодных асфальтобетонных смесей, а также щебня. Применяемый парк машин для уплотнения слоя материала характеризуется широким диапазоном массы катков и параметрами вальцов, что влияет на эффект уплотнения. Обеспечение качества уплотнения зависит от соответствия технологических режимов механизированного звена машин свойствам применяемых материалов. Необходима разработка технологии устройства слоев с применением асфальтогранулята с учетом его свойств, толщины, а также параметров уплотняющих машин. Результаты. Рассмотрена методика разработки технологии устройства дорожных конструкций при реконструкции и ремонте автомобильных дорог с применением асфальтогранулята. На основе экспериментальных исследований установлены зависимости между нагрузкой и деформацией слоя материала, деформацией и коэффициентом уплотнения, а также значения углов контакта вальца с поверхностью слоя уплотняемого материалом с учетом его гранулометрического состава и толщины укладываемого слоя. Выводы. Получена аналитическая зависимость для расчета напряжений в зоне контакта вальца со слоем асфальтогранулята, позволяющая назначать параметры катков в зависимости от свойств укладываемого материала. Предложенная методика разработки технологии устройства слоев с применением асфальтогранулята позволяет обеспечить требуемое качество уплотнения с учетом свойств материала, толщины укладываемого слоя и параметров уплотняющих машин. Statement of the problem. Currently used waste (asphalt granulate) when milling non-rigid pavements differs in its characteristics from hot and cold asphalt concrete mixtures, as well as crushed stone. The used fleet of machines for compacting a material layer is characterized by a wide range of roller weights and roller parameters, which affects the compaction effect. Ensuring the quality of compaction depends on the compliance of the technological modes of the mechanized link of machines with the properties of the materials used. It is necessary to develop a technology for the device of layers using asphalt granulate, taking into account its properties, thickness, as well as the parameters of compaction machines. Currently used waste (asphalt granulate) when milling non-rigid pavements differs in their characteristics from hot and cold asphalt mixes, as well as crushed stone. The used fleet of machines for compacting the material layer is characterized by a wide range of roller weights and roller parameters, which affects the compaction effect. Ensuring the quality of the seal depends on the compliance of the technological modes of the mechanized link of the machines with the properties of the materials used. It is necessary to develop a technology for the device of layers using asphalt granulate, taking into account its properties, thickness, as well as the parameters of compacted machines. Results. The method of development of technology for the device of road structures in the reconstruction and repair of highways with the use of asphalt granulate is considered. On the basis of experimental studies the dependence between the load and the deformation of the layer of material, deformation and compaction factor, and the values of the angles of contact of the roller with the surface layer of the compacted material with regard to its granulometric composition and thickness of the stacked layer. The simulation results of the interaction of the roller rink with the sealing material obtained analytical dependence for the calculation of stresses in the contact zone of the roller with the material, allowing to set the parameters of the rollers depending on the properties of asphalt granulate. Conclusions. An analytical dependence is obtained for calculating the stresses in the contact zone of the roller with the asphalt granulate layer, which allows one to assign the parameters of the rollers depending on the properties of the material being laid. The proposed method for developing the technology of layer arrangement using asphalt granulate allows to ensure the required quality of compaction, taking into account the properties of the material, the thickness of the layer to be laid and the parameters of compacted machines.

APA, Harvard, Vancouver, ISO, and other styles

33

Cao, Yan Li, Xiao Huo Li, Yong Dong Sha, and Hong Mei Liu. "Analysis on Cutting Ability of Picks on Continuous Miner." Advanced Materials Research 97-101 (March 2010): 4470–73. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.4470.

Full text

Abstract:

In order to obtain the continuous miner cutting ability of picks and its adaptability to coal, the average cutting force of continuous miner is got by means of the cutting electromotor power, and the cutting impedance is got compared with the single cutting resistance. It calculated and analyzed roller diameter, roller rotating speed, cutting power and the influence of the number of picks at work at the same time to the single cutting resistance.

APA, Harvard, Vancouver, ISO, and other styles

34

Huang, Qing Xue, Hai Lian Gui, Fei Fan, and Tao Song. "Analysis of the Mill Roller Bearing Using Mixed Fast Multipole Boundary Element Method." Advanced Materials Research 145 (October 2010): 159–64. http://dx.doi.org/10.4028/www.scientific.net/amr.145.159.

Full text

Abstract:

A new method named mixed fast multipole boundary element (MFM-BEM) is introduced in this paper to solve the contact problem of mill roller bearing. Incompatible elements and compatible elements are used to construct shape functions in non-contact area and contact area. On the one hand, MFM-BEM avoids satisfying the conditions of precise coordination in compatible elements, on the other hand, this method retains the merits of fast multipole boundary element method (FM-BEM). Through numerical examples, it clearly demonstrates that the calculation time and accuracy are improved. MFM-BEM provides an efficient numerical method for designing and analyzing the mill roller bearing. It also provides theoretical basis for prolonging mill roller bearing service life.

APA, Harvard, Vancouver, ISO, and other styles

35

Duan, Hongyu, Jiawei Song, and Zhijian Wang. "Lubrication and Fatigue Life Evaluation of High-Speed Cylindrical Roller Bearing under Misalignment." Mathematical Problems in Engineering 2020 (October 5, 2020): 1–11. http://dx.doi.org/10.1155/2020/2068924.

Full text

Abstract:

This paper developed a coupled model, incorporating the quasistatic model, fatigue life model, and mixed lubrication model, to investigate the effect of misalignment angle on high-speed cylindrical roller bearings. The model is verified by comparing with the published literature results. Then, a parametric analysis is carried out. The results show that as the misalignment increases, the load distribution is basically unchanged, but the fatigue life of the roller bearing decreases due to the variation of contact pressure, and the skewing moment of single roller contact pair increases. Furthermore, the optimal design of roller profile needs to consider the effect of lubrication in order to improve the fatigue life of roller bearings. In general, the optimal crown drop is too small according to the design from the slicing technique.

APA, Harvard, Vancouver, ISO, and other styles

36

Cui, Lingli, Chunguang Wu, Chunqing Ma, and Huaqing Wang. "Diagnosis of Roller Bearings Compound Fault Using Underdetermined Blind Source Separation Algorithm Based on Null-Space Pursuit." Shock and Vibration 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/131489.

Full text

Abstract:

In order to solve the problem of underdetermined blind source separation (BSS) in the diagnosis of compound fault of roller bearings, an underdetermined BSS algorithm based on null-space pursuit (NSP) was proposed. In this algorithm, the signal model of faulty roller bearing is firstly used to construct an appropriate differential operator in null space. With the constructed differential operator, the mixed signals collected by the vibration sensor are decomposed into a series of stacks of narrow band signal containing the characteristics of faulty bearing. Finally, the underdetermined problem is transformed to an overdetermined problem by combining the narrow band signals and the original mixed signals into a new group of observed signals. In this way, the separation of the mixed signals can be realized. Experiments and engineering data analyses show that the problem of underdetermined BSS can be solved effectively by this approach, and then the compound fault of the roller bearing can be separated.

APA, Harvard, Vancouver, ISO, and other styles

37

Sverdlik, Mikhail, Alexander Pesin, and D. O. Pustovoytov. "Theoretical Basis and Technology Development of the Combined Process of Asymmetric Rolling and Plastic Bending." Advanced Materials Research 586 (November 2012): 259–64. http://dx.doi.org/10.4028/www.scientific.net/amr.586.259.

Full text

Abstract:

The article focuses at technology development of the vertical asymmetric rolling and combined process of vertical asymmetric rolling and plastic bending. It has been shown that vertical asymmetric rolling peculiarity relates to the presence of a mixed zone, in which friction forces on contact roll surfaces are directed are differently. Experimental research showed serious drawbacks in the rolling technology caused by the growth of dynamic loads arising at the moment of plate contact with the bending roller. For solving the problem it was proposed to make the roller position motile to allow its movement along the required trajectory. The application of the motile roller helps to reduce dangerous torque differentiation at working rolls by the value of 1,5-2,5 compared with the rigidly fixed roller. The most effective bending roller trajectory is a second-order curve that is convex parabola.

APA, Harvard, Vancouver, ISO, and other styles

38

DeFeo, Mary E., Kelsey V. Shampoe, Pedro H. V. Carvalho, Flavia A. S. Silva, and Tara L. Felix. "In vitro and in situ techniques yield different estimates of ruminal disappearance of barley." Translational Animal Science 4, no. 1 (October 29, 2019): 141–48. http://dx.doi.org/10.1093/tas/txz170.

Full text

Abstract:

Abstract Objectives were to compare in vitro and in situ disappearance of dry matter (DM), neutral detergent fiber (NDF), and starch of traditional (unprocessed and rolled) and hulless (unprocessed) barley. Experiment 1: three barley sources were compared using in vitro techniques. The sources were: 1) traditional barley that was not processed, 2) traditional barley processed through a roller mill, and 3) hulless barley that was not processed. For in vitro incubation, each barley source was ground through a 1-mm screen. Ground barley sources were weighed into bags (25 micron porosity) and incubated in ruminal fluid from two steers fed 80% rolled corn for 3, 6, 12, 24, 48, or 72 h. Intact bags were assayed for NDF; remaining bags were opened and the residual was removed and analyzed to determine disappearance of DM and starch. Experiment 2: the barley sources used in Exp. 1 were compared using in situ techniques. For in situ analysis, each barley source was ground in a Wiley mill with no screen to mimic mastication. Artificially masticated samples were weighed into Dacron bags (50 ± 10 micron porosity) and incubated in eight ruminally fistulated steers (n = 8) for 3, 6, 12, 24, 48, and 72 h. Residual contents were analyzed to determine in situ disappearance of DM, NDF, and starch. Data were analyzed using the MIXED procedures of SAS (9.4 SAS Institute, Cary, NC) with repeated measures. DM disappearance was greatest (P < 0.05) for hulless barley in vitro and for rolled barley in situ, regardless of time postincubation. For both trials, NDF disappearance was greatest (P < 0.05) for hulless barley, regardless of time postincubation. Starch disappearance at all time points was greatest (P < 0.05) for rolled barley in situ. Starch disappearance was greater (P < 0.05) for hulless barley at 6 h of in vitro incubation compared to rolled and unprocessed barley, whereas starch disappearance in vitro was comparable (P = 0.60) between barley sources. When the grains were compared in vitro, minor differences were noted, presumably because barley sources were finely ground prior to incubation. Compared to in vitro estimates, in situ techniques had greater variation in ruminal degradation estimates. Differences observed between in situ and in vitro techniques are driven largely by differences between the procedures. Although laboratory methods are widely used to estimate ruminal degradation, these techniques did not provide comparable estimates of ruminal degradation of barley.

APA, Harvard, Vancouver, ISO, and other styles

39

Ghosn, L. J. "Analysis of Crack Propagation in Roller Bearings Using the Boundary Integral Equation Method—A Mixed-Mode Loading Problem." Journal of Tribology 110, no. 3 (July 1, 1988): 408–13. http://dx.doi.org/10.1115/1.3261643.

Full text

Abstract:

Crack propagation in a rotating inner raceway of a high-speed roller bearing is analyzed using the boundary integral method. The model consists of an edge plate under plane strain condition upon which varying Hertzian stress fields are superimposed. A multidomain boundary integral equation using quadratic elements was written to determine the stress intensity factors KI and KII at the crack tip for various roller positions. The multidomain formulation allows the two faces of the crack to be modeled in two different subregions making it possible to analyze crack closure when the roller is positioned on or close to the crack line. KI and KII stress intensity factors along any direction were computed. These calculations permit determination of crack growth direction along which the average KI times the alternating KI is maximum.

APA, Harvard, Vancouver, ISO, and other styles

40

Ippoliti, Francesco, Fernando Piscioneri, Patrizio Sartini, Mariangela Peruzzi, Marina Di Domenico, David Dannhauser, Domenico Rossi, et al. "Comparative spallation performance of silicone versus Tygon extracorporeal circulation tubing." Interactive CardioVascular and Thoracic Surgery 29, no. 5 (July 13, 2019): 685–92. http://dx.doi.org/10.1093/icvts/ivz170.

Full text

Abstract:

Abstract OBJECTIVES Reports ranged from mixed to marginal tubing wear and spallation effects as a complication of roller pumps in cardiopulmonary bypass (CPB). Because the rollers constantly compress part of the tubing, we sought to determine whether circuit materials behave differently under a 3-h simulation of CPB. METHODS Two different tubing materials (silicone and Tygon) were tested with a customized experimental circuit, designed to allow in vitro simulation of CPB with priming volumes, pressures, revolutions per minute and temperatures equivalent to the clinical scenario. Samples were analysed with optical and field-emission scanning electron microscopy. We collected 200-ml fluid samples at 4 different times: before starting the CPB (T0), when the predicted revolutions per minute corresponded to about 2 min of CPB (T1), at 90 min (T2) and at 180 min (T3). At the end of CPB, we harvested 2 samples of tubing. Lastly, optical investigations and field-emission scanning electron microscopy observations were used for qualitative and quantitative analysis of circulating fragments. RESULTS T2 and T3 fluid samples showed more particles than T1 samples. Significant differences in terms of particle numbers were detected: silicone tubing released more fragments per millilitre than Tygon tubing, with both materials releasing particles from 5 to 500 µm. Silicone tubing was associated with a time-dependent increase in small particles released (P = 0.04), whereas this did not apply to large particles or to Tygon tubing. Yet, bootstrap estimates suggested that silicone tubing was associated with the release of more small particles whereas Tygon tubing released more large particles (both P < 0.01). Unlike silicone, Tygon samples taken from the portion of the circuit not subjected to the action of the roller pump did not show any erosion on their surfaces. Samples of both materials taken from the portion subjected to the compression of the roller pump showed signs of significant deterioration. CONCLUSIONS Silicone showed a worse spallation performance than Tygon, thus appearing less safe for more complex surgery of prolonged duration or for patients with a prior cerebral ischaemic event. Additional risk and cost-effectiveness comparisons to determine the potential benefits of one type of tubing material over the other are warranted to further expand our findings.

APA, Harvard, Vancouver, ISO, and other styles

41

Khurram, Muhammad, Riaz Ahmad Mufti, Muhammad Usman Bhutta, Yousaf Habib, Arslan Ahmed, and Naqash Afzal. "A NUMERICAL APPROACH TO CALCULATE CREEP IN ROLLER FOLLOWER VALVE TRAIN BASING ON FRICTION AND LUBRICATION MODELING." Transactions of the Canadian Society for Mechanical Engineering 39, no. 4 (December 2015): 805–18. http://dx.doi.org/10.1139/tcsme-2015-0064.

Full text

Abstract:

A numerical approach basing on friction and lubrication analysis has been developed to determine the creep at cam/roller interface in end pivoted roller finger follower valve train. The kinematic and dynamic analysis at the geometrical mating surfaces of cam and roller follower has been carried out to predict the required instantaneous motion parameters and normal loading whereas the oil film thickness is determined using lubrication analysis. The tangential forces have been computed precisely using elastohydrodynamic and mixed lubrication concept for a complete cam cycle. At low camshaft operating speeds, the creep proves to be low whereas the creep increases significantly under the influence of high tangential loading at higher operating speeds.

APA, Harvard, Vancouver, ISO, and other styles

42

Li, Yunfeng, and Di Jiang. "Strength check of a three-row roller slewing bearing based on a mixed finite element model." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 18 (April 6, 2016): 3393–400. http://dx.doi.org/10.1177/0954406216644267.

Full text

Abstract:

For the two failure modes of a three-row roller slewing bearing, ring fracture and raceway spalling, a method for checking the strength of a slewing bearing through finite element analysis is proposed. This method calculates the internal stress distribution of the bearing rings by using the mixed finite element model with both solid elements and spring elements of the slewing bearing assembly and checks the bearing structural strength by using the maximum internal stress of the bearing rings. The method also calculates the contact stress between the roller and raceways by using the entity contact model between the roller and the raceways; the obtained maximum contact stress is used to check the contact strength of the slewing bearing. The proposed mixed finite element model considers the structural deformation of the bearing rings, and the calculated results can reflect the real situation more accurately than the traditional analytical model with the hypothesis of rigid ring. The proposed method also avoids the solution problem, which has large-scale calculation and difficulty of convergence of the entity finite element model of a slewing bearing, and the calculation efficiency is improved effectively. The calculated results by mixed finite element model are consistent with the failure mode of this type of slewing bearing in engineering practice.

APA, Harvard, Vancouver, ISO, and other styles

43

Hashimoto, Hiromu. "Friction characteristics between paper and steel roller under mixed lubrication." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 226, no. 12 (November 19, 2012): 1127–40. http://dx.doi.org/10.1177/1350650112461880.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Armagan, Kemal, Sadık Alper Yıldızel, and Yusuf Arslan. "Steel scrap added roller compacted concrete." Challenge Journal of Concrete Research Letters 10, no. 1 (March 10, 2019): 7. http://dx.doi.org/10.20528/cjcrl.2019.01.002.

Full text

Abstract:

The purpose of this paper is to investigate the benefits of using steel slag as an additive in Roller Compacted Concrete (RCC) which is a promising material can be used in streets, local roads, residential streets, high-volume roads, industrial access roads, airports...etc. The mechanical performances of steel scrap added reinforced cementitious composites produced with an industrial punch scrap. In specimen mixtures two types of scraps with diameters of 5 mm and 7 mm were used. The additive was mixed with 1%, 1.5% and 2% ratios by weight. Due to the results of the study, it was obtained that flexural strength properties of the specimens have increased up to 11%. In addition, freeze thaw effect of the specimens was investigated and found that 2% percent of scrap usage was given the best results.

APA, Harvard, Vancouver, ISO, and other styles

45

Abed, Mohammed A., and Alaa H. Abed. "Effect of Hybrid Modification and Type of Compaction on the Cracking Properties of Asphalt Concrete." Al-Nahrain Journal for Engineering Sciences 23, no. 2 (September 18, 2020): 106–16. http://dx.doi.org/10.29194/njes.23020106.

Full text

Abstract:

This paper focused on evaluating the effect of aggregate gradation and polymer modification on indirect tensile strength (ITS) and the static stiffness for hot asphalt mixtures. In particular, data from ITS tests have been processed to obtain stiffness measurements through the application of Hondros theory. The results showed that fine mixtures had a better tensile strength by 26.3% than the coarse mixtures. The effect of compaction also was examined, the results showed that samples compacted with the Superpave gyratory compactor (SGC) had an enhancement in ITS by 36.58 and 23.1% in comparison with Marshall and roller compactor respectively. Polymer modifiers were used to estimate their effect on tensile strength, adding 4, 6, and 8% of Styrene-Butadiene-Styrene (SBS), which can rise the ITS by 3.2,6.14 and 13.3% of the non-modified asphalt mixture. Furthermore, using 4, 6, and 8 percent of SBS could increase static stiffness by 53.9, 209.6, and 302.4% respectively for roller compacted fine mixes and 58, 220, and 379.3% for SGC compacted mixes. Furthermore, SBS raised the stiffness modulus by 52.3, 188, and 295% for Marshall compacted mixes. Using hybrid modifier can improve the stiffness of the asphalt mixture. However, The results indicate that using 1, 2 and 3% polyvinyl chloride (PVC) can magnify the stiffness of mixtures by 41.2, 199.8% and 262.6 for roller compacted mixtures and 133.4, 212.1 and 354% for SGC compacted mixtures, whereas there is a stringent increasing by 133.4, 189.2 and 354% for Marshall compacted mixes. Otherwise, polymer-modification can decrease the fracturing index for coarse and fine mixtures.

APA, Harvard, Vancouver, ISO, and other styles

46

Zhang, Zhenhua, Jiaxu Wang, Guangwu Zhou, and Xin Pei. "Analysis of mixed lubrication of RV reducer turning arm roller bearing." Industrial Lubrication and Tribology 70, no. 1 (January 8, 2018): 161–71. http://dx.doi.org/10.1108/ilt-12-2016-0311.

Full text

Abstract:

Purpose This paper aims to solve the lubrication failures in the turning arm bearing of RV reducer, give some help in perfecting the bearing structure design and provide theoretical basis for the reducer’s performance improvement. Design/methodology/approach The paper establishes a mixed lubrication analysis model to study performance parameters. According to the discretization of parameters and iteration of equations, numerical simulation and theoretical analysis are achieved in computational process. Findings Considering influences of contact load, real rough surface and realistic geometry of RV reducer turning arm roller bearing, the mixed lubrication analysis model is established to study the ratio of oil film thickness, pressure distribution and maximum von Mises stress in different speeds, temperatures and fillets. The results of mixed lubrication show that reasonable round corner modification, increase in temperature and speed, decrease of surface roughness and lubricant types can improve the lubrication performance. Originality/value The mixed lubrication analysis model is established to study the influences of contact load, real rough surface and realistic geometry of RV reducer turning arm roller bearing. Different speed, temperature, lubricant and fillet modification are also considered in the research to analyze oil film thickness, pressure distribution and maximum von Mises stress. These studies can optimize structural design of bearing and direct engineer operations.

APA, Harvard, Vancouver, ISO, and other styles

47

He, Tao, Dong Zhu, Chengjiao Yu, and Q. Jane Wang. "Mixed elastohydrodynamic lubrication model for finite roller-coated half space interfaces." Tribology International 134 (June 2019): 178–89. http://dx.doi.org/10.1016/j.triboint.2019.02.001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Li, Zhenzi, Hui Wang, Hongbin Zhou, and HuiJian Li. "A mixed method of determining the thermal stress for cold roller." Journal of Central South University of Technology 4, no. 2 (November 1997): 100–103. http://dx.doi.org/10.1007/s11771-997-0007-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Zhou, Guangwu, Yuhao Zhang, Zhongzheng Wang, and Wei Pu. "Analysis of transient mixed elastohydrodynamic lubrication in planetary roller screw mechanism." Tribology International 163 (November 2021): 107158. http://dx.doi.org/10.1016/j.triboint.2021.107158.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Carcea, Marina, Valeria Turfani, Valentina Narducci, Sahara Melloni, Vincenzo Galli, and Valentina Tullio. "Stone Milling versus Roller Milling in Soft Wheat: Influence on Products Composition." Foods 9, no. 1 (December 19, 2019): 3. http://dx.doi.org/10.3390/foods9010003.

Full text

Abstract:

Wholegrain wheat flours are in great demand from consumers worldwide because they are considered healthier then refined flours. They can be obtained by either stone milling, which is experiencing a revival in Europe, or roller milling. In order to study compositional differences due to the milling technology and to explore the possibility of a better qualification of wholegrain flours by means of nutritionally oriented quality parameters, eight mixes of soft wheat grains were stone milled and roller milled and the milling products were analyzed for their protein, ash, lipids, total dietary fibre, total polyphenols and alkylresorcinols content. A wholegrain flour milled with a laboratory disk mill was used as a comparison and a set of seven wholegrain flours purchased on themarket were also analyzed and compared. The particle size distribution of stone milled and recombined roller milled flour was also studied. Considering the above mentioned parameters, we found that there is no compositional difference between a stone milled or a roller milled flour if, in this latter one, the milling streams are all recombined, but the particle size distribution was different. This might have an impact on the technological quality of flours and on the bioavailability of components.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Roller mixer'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles