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Journal articles on the topic 'High strength Testing'

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

Price, W. F., and J. P. Hynes. "In-situ strength testing of high strength concrete." Magazine of Concrete Research 48, no. 176 (September 1996): 189–97. http://dx.doi.org/10.1680/macr.1996.48.176.189.

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2

Mikaelian, Karnig O. "Testing diamond strength at high pressure." Diamond and Related Materials 20, no. 10 (November 2011): 1340–43. http://dx.doi.org/10.1016/j.diamond.2011.09.005.

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3

Johnson, Claude D., and S. Ali Mirza. "Confined capping system for compressive strength testing of high performance concrete cylinders." Canadian Journal of Civil Engineering 22, no. 3 (June 1, 1995): 617–20. http://dx.doi.org/10.1139/l95-070.

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This paper presents a simple, inexpensive confined cap testing method which can be employed in the compressive strength testing of high performance concrete cylinders. An inexpensive customized cylinder capping apparatus and standard concrete laboratory testing equipment are employed. The paper describes the capping apparatus, capping and testing procedures, as well as test results for concrete compressive strengths up to and exceeding 100 MPa. Key words: capping, capping confinement, compressive strength, cylinders, end condition, grinding, high-strength concrete, specimen size, testing.

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4

Hooton, RD, M. Sonebi, and KH Khayat. "Testing Abrasion Resistance of High-Strength Concrete." Cement, Concrete and Aggregates 23, no. 1 (2001): 34. http://dx.doi.org/10.1520/cca10523j.

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5

Richardson, Gregory N., and John A. Bove. "Testing and monitoring of high strength geosynthetics." Geotextiles and Geomembranes 6, no. 1-3 (January 1987): 157–72. http://dx.doi.org/10.1016/0266-1144(87)90063-x.

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6

Affolter, Christian, Ulrich Müller, Christian Leinenbach, and Bernhard Weisse. "Compressive Testing of Ductile High-Strength Alloys." Journal of Testing and Evaluation 43, no. 6 (June 11, 2015): 20140301. http://dx.doi.org/10.1520/jte20140301.

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7

Mentl, Vaclav, and Josef Bystricky. "Compression Tests of High Strength Steels." Advanced Materials Research 59 (December 2008): 293–98. http://dx.doi.org/10.4028/www.scientific.net/amr.59.293.

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Mathematical modelling and virtual testing of components and structures represent a useful and economic tool for design and safety assessment. The basic mechanical properties which can be found in material standards are not relevant in cases where the real service conditions differ from those applied during standardised testing. Thus e.g. mechanical behaviour at higher strain rates can be interesting for the car components when the simulation of crash situations is used during structure development. The dynamic compression tests are usually performed by means of drop towers, by means of high speed hydraulic testing machines or Hopkinson bar method. At the Mechanical Testing Laboratory of the SKODA Research Inst. in Pilsen, Czech Republic, an instrumentation of Charpy pendulum testing machine was realised in order that it was possible to perfom dynamic compression tests, [1], and the compatibility of obtained results in comparison with traditional impact compression tests was verified within the round–robin carried out by TC5 ESIS Sub-Committee on “Mechanical Testing at Intermediate Strain Rates“, [2]. A new striking tup and load measurement system were designed and callibrated. At the same time, a new software was developed which makes it possible to evaluate the test force-deformation record. The goal of this study was 1. to check the possibility of compression testing of high strength materilas by mens of Charpy pendulum, and 2. to study the strain rate influence on basic mechanical properties.

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8

Sovová, Kateřina, Karel Mikulica, Adam Hubáček, and Karel Dvořák. "Behavior of High Strength Concrete at High Temperatures." Solid State Phenomena 276 (June 2018): 259–64. http://dx.doi.org/10.4028/www.scientific.net/ssp.276.259.

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Concrete is considered as a non-combustible building material. However, at High-Performance Concrete (HPC) is due to its dense structure more likely to occur in explosive spalling. This results in lost of load bearing capacity function of concrete. This paper deals with design, production and testing of the cement-based concrete with the use of different fibers (polypropylene fibers and cellulose fibers). It also assesses the influence of high temperature on strength, visual changes of specimens, changes of surface and degradation of testing specimens due to heat loads according to normative heat curve and also according to hydrocarbon curve.

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9

OCHIAI, Ikuo. "Manufacture and Testing of High Strength Steel Wires." Journal of the Japan Society for Technology of Plasticity 51, no. 593 (2010): 493–97. http://dx.doi.org/10.9773/sosei.51.493.

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10

Sucharda, O., V. Bilek, and P. Mateckova. "Testing and mechanical properties of high strength concrete." IOP Conference Series: Materials Science and Engineering 549 (June 18, 2019): 012012. http://dx.doi.org/10.1088/1757-899x/549/1/012012.

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11

Jacobsen, Stefan, Hans Christian Gran, Erik J. Sellevold, and Jon Arne Bakke. "High strength concrete — Freeze/thaw testing and cracking." Cement and Concrete Research 25, no. 8 (December 1995): 1775–80. http://dx.doi.org/10.1016/0008-8846(95)00173-5.

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12

Solikin, Mochamad. "Compressive Strength Development of High Strength High Volume Fly Ash Concrete by Using Local Material." Materials Science Forum 872 (September 2016): 271–75. http://dx.doi.org/10.4028/www.scientific.net/msf.872.271.

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This paper presents a research to produce high strength concrete incorporated with fly ash as cement replacement up to 50% (high volume fly ash concrete) by using local material. The research is conducted by testing the strength development of high volume fly ash concrete at the age of 14 days, 28 days and 56 days. As a control mix, the compressive strength of Ordinary Portland Cement (OPC) concrete without fly ash is used. Both concrete mixtures use low w/c. consequently, they lead to the use of 1 % superplasticizer to reach sufficient workability in the process of casting. The specimens are concrete cubes with the dimension of 15 cm x15 cm x 15 cm. The totals of 24 cubes of HVFA concrete and OPC concrete are used as specimens of testing. The compressive strength design of concrete is 45 MPa and the slump design is ± 10 cm. The result shows that the compressive strengths of OPC concrete at the age of 14 days, 28 days, and 56 days are 38 MPa, 40 MPa, and 42 MPa. Whereas the compressive strength of HVFA concrete in the same age of immersing sequence are 29 MPa, 39 MPa, and 42 MPa. The result indicates that HVFA concrete can reach the similar compressive strength as that of normal concrete especially at the age of 56 days by deploying low water cement ratio.

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13

Shi, Jie, Wen Quan Cao, and Han Dong. "Ultrafine Grained High Strength Low Alloy Steel with High Strength and High Ductility." Materials Science Forum 654-656 (June 2010): 238–41. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.238.

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In this study a C-Mn High Strength Low Alloy steel (HSLAs) was processed by quenching and austenite reverted transformation during annealing (ART-annealing), which results in an ultrafine grained duplex microstructure characterized by scanning electron microscopy equipped with electron back scattered diffraction, transmission electron microscopy and x-rays diffraction (SEM/EBSD, TEM and XRD). Microstructural observation revealed that the full hard martensitic microstucture gradually transformed into ultrafine grained duplex structure with austenite volume fraction up to 30% at specific annealing conditions. Mechanical properties of this processed steel measured by uniaxial tensile testing demonstrated that an excellent combination of strength (Rm~1GPa) and total elongation (A5~40%) at 30% metastable austenite condition in studied C-Mn-HSLAs. This substantially improved strength and ductility were attributed to the strain induced phase transformation of retained austenite dispersed throughout the ultrafine grained microstructure. At last it is proposed that ART-annealing is a promising way to produce high strength and high ductility steel products.

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14

Selverian, J. H., D. A. O’Neil, and S. Kang. "Performance Testing and Strength Prediction of Ceramic-to-Metal Joints." Journal of Engineering for Gas Turbines and Power 116, no. 3 (July 1, 1994): 622–28. http://dx.doi.org/10.1115/1.2906865.

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Brazed joints were made between silicon nitride and Ni-based and Fe-based super alloys. Room temperature shear (torsion) strengths ranged from 75-242 MPa for Si3N4-to-Incoloy 909 joints and from 30-127 MPa for the Si3N4-to-Inconel 718 joints. At 500°C the joint strength was 120 MPa while at 650°C and 950°C the joint strengths were less than 20 MPa. These low strengths at 650°C and 950°C were attributed to a reduction in the shrink-fit and to low braze strength at these high temperatures. Finite element analysis (FEA) and a probabilistic failure theory (CARES) were used to predict the joint strengths. The predicted joint strengths agreed well with measured joint strengths in torsional loading at 20°C. Torsion tests were also performed at 650°C. Aspects of the material systems, residual stresses, mechanical behavior, and strength predictions and presented. Two new braze alloys based on the Au-Ni-Cr-Fe system were used to overcome the poor high-temperature strength. Joints made with these brazes had good strength (85 MPa and 35 N-m) at 650°C.

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15

Lu, Jun, Todd Adkins, Iain Dixon, Doan Nguyen, and Ke Han. "Nondestructive Testing of High Strength Conductors for High Field Pulsed Magnets." IEEE Transactions on Applied Superconductivity 30, no. 4 (June 2020): 1–5. http://dx.doi.org/10.1109/tasc.2020.2980525.

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16

Baranova, Al'bina, and Ol'ga Yazina. "FOAM CONCRETES BASED ON HIGH-STRENGTH BINDERS." Modern Technologies and Scientific and Technological Progress 2018, no. 1 (March 23, 2020): 97–98. http://dx.doi.org/10.36629/2686-9896-2020-2018-1-97-98.

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17

Tomášek, Radek, and Vratislav Mareš. "Dynamic Tensile Testing of High Strength Armor Steel Plates." Key Engineering Materials 741 (June 2017): 70–75. http://dx.doi.org/10.4028/www.scientific.net/kem.741.70.

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In this paper was studied dynamic behavior of the armor steels Armox 500T and Secure 500 by testing specimens in quasi-static tensile test with strain rate 1∙10-3 s-1 and high-speed tensile test within range of intermediate strain rates from 100 s-1 to 400s-1 at the room temperature. Hardness test and quasi-static tensile test confirmed material properties specified by the manufacturer. Stress-strain diagrams showed very low strain-rate hardening effect at investigated strain rates. Total elongation at fracture was larger in case of Armox 500T for the whole strain rate range. Deformation energy density was calculated from the stress-strain curve and temperature rise due to adiabatic heating was estimated. Because of higher total elongation, Armox 500T was able to withstand higher deformation energy.

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18

Elbasha, N., and M. N. S. Hadi. "Experimental testing of helically confined high-strength concrete beams." Structural Concrete 6, no. 2 (June 2005): 43–48. http://dx.doi.org/10.1680/stco.2005.6.2.43.

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19

Kumar, C. Naga Satish, and T. D. Gunneswara Rao. "Fracture parameters of high-strength concrete – mode II testing." Magazine of Concrete Research 62, no. 3 (March 2010): 157–62. http://dx.doi.org/10.1680/macr.2010.62.3.157.

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20

Thomas, C., J. Sainz-Aja, J. Setien, A. Cimentada, and J. A. Polanco. "Resonance fatigue testing on high-strength self-compacting concrete." Journal of Building Engineering 35 (March 2021): 102057. http://dx.doi.org/10.1016/j.jobe.2020.102057.

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21

Latypova, Renata, Timo Kauppi, Saara Mehtonen, Hannu Hänninen, David Porter, and Jukka Kömi. "Novel stress corrosion testing method for high-strength steels." Materials and Corrosion 70, no. 3 (October 15, 2018): 521–28. http://dx.doi.org/10.1002/maco.201810462.

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22

Haiko, Oskari, Kati Valtonen, Antti Kaijalainen, Vahid Javaheri, and Jukka Kömi. "High-stress abrasive wear characteristics of ultra-high strength press-hardening steel." Tribologia - Finnish Journal of Tribology 39, no. 3−4 (December 31, 2022): 32–41. http://dx.doi.org/10.30678/fjt.122836.

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Ultra-high strength steels are widely utilized in many applications operating in harsh abrasive wear conditions. For instance, the machineries used in mining and mineral handling or in agricultural sector require robust, but cost-effective wear-resistant materials. Steels provide excellent combination of mechanical properties and usability. This study encompasses mechanical and wear testing of an experimental medium-carbon press-hardening steel. The as-received material was austenitized at two different temperatures and quenched in water. Additionally, low-temperature tempering was applied for one variant. In total, three variants of the press-hardening steel were produced. Microstructural characterization and mechanical testing were conducted for the steel samples. The wear testing was carried out with high-stress abrasive method, in which the samples were rotated inside a crushed granite bed. A commercial 400 HB grade wear-resistant steel was included in the wear testing as a reference. The experimental steel showed very high mechanical properties reaching tensile strength up to 2600 MPa with hardness of 750 HV10. Wear testing resulted in only minimal differences between the three variants indicating that the improved impact toughness by tempering did not significantly affect the wear resistance. The reference steel had nearly two times greater mass loss compared to the higher hardness press-hardening steels. Microhardness measurements on the worn surface showed drastic increase in hardness for the deformed structure for all samples. It was concluded that even the high-hardness martensitic steels exhibit notable wear surface work-hardening. Therefore, hardness was determined to be the most significant factor affecting the wear performance of studied steels.

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23

Wang, Zheng Jun, Mei Han, and Felix Zhao. "Applying Research on Testing Technique of High Performance Concrete." Advanced Materials Research 378-379 (October 2011): 226–29. http://dx.doi.org/10.4028/www.scientific.net/amr.378-379.226.

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In order to master timely and accurately construction quality of high performance concrete, detection of compressive strength of high performance concrete can be tested non-destructively, rapidly and accurately. The paper did preliminary research on high performance concrete with redound method, furthermore, it established estimation model between rebound value and compressive strength. Experiment shows that rebound method can effetely test compressive strength of high performance concrete. Construction quality of Cement concrete structure or component can timely grasped in period of construction with the method.

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24

Shaddock, David, and Liang Yin. "High Temperature Laminate Characterization." Journal of Microelectronics and Electronic Packaging 11, no. 4 (October 1, 2014): 146–57. http://dx.doi.org/10.4071/imaps.427.

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Characterization and modeling of high-temperature laminates for application at 200–250°C is reported to compare and better quantify the mean lifetime based on key functional parameters of via cycling, weight loss, peel strength, and surface insulation resistance (SIR). Life testing and models are applied for via cyclic life, peel strength, and weight loss. Five high-temperature laminates, consisting of three polyimides and two nonpolyimides, were evaluated. The polyimide laminates behaved similarly in via, weight loss, peel strength, and SIR testing with small variances. The nonpolyimides performed longer in via and weight loss. They degraded more rapidly than the polyimides in peel strength and failed in SIR, due to its flame retardant. A comparison of lifetime among the five laminates is presented.

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25

Sharpe, William N. "Tensile Testing of MEMS Materials at High Temperatures." Applied Mechanics and Materials 3-4 (August 2006): 59–64. http://dx.doi.org/10.4028/www.scientific.net/amm.3-4.59.

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This paper presents three kinds of high-temperature test methods for three different materials along with the results. Resistively heated polysilicon film 3.5 micron thick shows ductile behavior at 500°C. Resistively heated nickel 200 microns thick shows decreasing strength at 400°C. Furnace heated silicon carbide 200 microns thick maintains its strength at 1000°C. Strain is measured by laser-based interferometry in the first two cases to obtain complete stress-strain curves, while force-displacement is measured in the third case.

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26

Morris, Peter Henri, and David John Williams. "A revision of Blight's model of field vane testing." Canadian Geotechnical Journal 37, no. 5 (October 1, 2000): 1089–98. http://dx.doi.org/10.1139/t00-035.

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Vane shear test data obtained by a number of researchers show that the excess pore pressures generated within the soil surrounding the vane by vane insertion and rotation and their effects on the measured vane shear strength have been misinterpreted for many years. The accepted model developed by Blight of field vane testing and the accepted criteria for determining undrained and fully drained vane shear strengths are based on this misinterpretation. Consequently, estimates that are based on this model of the degree of drainage that has been attained at the time the vane shear strength is measured may be significantly in error, and the measured undrained shear strengths may be unconservative. A revision of Blight's approximate theory of field vane testing is presented which is consistent with the available experimental data. Revised practical criteria for determining the undrained and fully drained shear strengths are also presented, and a simple revision of current standard vane shear test methods is proposed which would eliminate, for all but those soils with very high coefficients of consolidation, the possibility that estimates of the undrained vane shear strength may be unconservative.Key words: vane shear, undrained strength, drained strength, excess pore pressure.

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27

Stevenson, Peter E., Todd R. Skochdopole, L. Cassady, Dennis Pihs, and Ajit D. Kelkar. "Testing of High Strength Fabrics: Reporting Modulus, Low Strain Properties, and Ultimate Tensile Strength." Journal of Industrial Textiles 29, no. 4 (April 2000): 259–72. http://dx.doi.org/10.1177/152808370002900403.

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Measurement of the tensile properties of high strength woven and knit fabrics, including geotextiles and geogrids traditionally make use of roller grip-type clamping systems. These grips are designed to allow a sample to be pulled in tension without applying an excessive crimping or compressive force on the specimen, thus avoiding premature failure. Roller grips, also known as capstan grips, also have the advantage of allowing the specimen to align itself with the applied force therefore loading the specimen uniformly across the width. However, since the specimen tightens itself around the grip during testing, crosshead travel cannot be used to measure specimen strain, which makes the determination of low strain properties and the selection of modulus values difficult. Two issues that must be addressed in obtaining low strain properties are how to measure sample strain and how to get an accurate and repeatable starting point for the test. This paper will explore alternate methods of gripping systems, strain measurement and data analysis with the objective of accurately measuring and reporting low strain properties of woven and knit textiles.

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28

STEVENSON, PETER E., TODD R. SKOCHDOPOLE, L. CASSADY, DENNIS PIHS, and AJIT D. KELKAR. "Testing of High Strength Fabrics: Reporting Modulus, Low Strain Properties, and Ultimate Tensile Strength." Journal of Industrial Textiles 29, no. 4 (April 1, 2000): 259–72. http://dx.doi.org/10.1106/bckb-721e-wanf-7ta4.

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29

Mitter, F., J. Schrank, E. Werner, and E. Pink. "High-temperature strength testing of directly resistance-heated metal specimens." High Temperature Technology 7, no. 3 (August 1989): 145–51. http://dx.doi.org/10.1080/02619180.1989.11753427.

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30

Inoue, M., Y. Takizawa, and A. Okada. "Non-linear flexure testing of a high-strength glass disk." International Journal of Solids and Structures 28, no. 9 (1991): 1185–97. http://dx.doi.org/10.1016/0020-7683(91)90111-r.

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31

A.M. Mhamoud, Hassan, and Jia Yanmin. "Effect of different additives on high temperatures of concrete." Journal of Structural Fire Engineering 9, no. 2 (June 11, 2018): 161–70. http://dx.doi.org/10.1108/jsfe-01-2017-0021.

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Purpose This study aims to investigate the effectiveness of different additives (individual effects) in improving the strength of concrete to resist temperatures of up to 60ºC. Design/methodology/approach In all, 13 different mixtures with a constant water/binder ratio of 0.36 and grade M40 were prepared by using ordinary Portland concrete alone, or with partial replacement by fly ash (FA), blast-furnace slag, silica fume (SF) and a combination of all three. After 7 and 28 days under water, their strength and residual strength were measured. Findings The results of testing revealed that the addition of 10 per cent SF was found to result in the greatest increase in compressive strength and flexural strength along with decreased the residual strengths. The addition of FA increased the compressive strength and enhanced the residual compressive strength. However, it also decreased the residual flexural strength. Originality/value The addition of slag achieved better flexural strength and the best residual compressive strength. The combination of additives also enhanced the compressive strength but was not found to be better than using SF alone.

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32

Yi, Wei Jian, and Yan Mei Lv. "Experimental Study on Shear Failure of High-Strength Concrete Beams with High-Strength Stirrups." Key Engineering Materials 400-402 (October 2008): 857–63. http://dx.doi.org/10.4028/www.scientific.net/kem.400-402.857.

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19 RC beams with shear span-to-depth equal to 3 were tested under a stiff testing facility, and complete load-deflection curves including the post-peak branch were obtained. Based on the test results the effects of concrete strength, stirrups strength, inclined stirrup angle, the amount of longitudinal reinforcement on failure mode, shear ductility index and shear capacity were analyzed. The test results were compared with the shear design approaches of Chinese Code and American Code. The results indicate that the shear failure of beam with appropriate web reinforcement has finite ductility. High-strength concrete beams with high-strength stirrups can increase not only the shear capacity, but also the shear ductility. The shear capacity of beams with high-strength concrete and stirrup can be designed with Chinese Code, but shear capacity of high-strength concrete beams without stirrups, or with the smaller amount of longitudinal reinforcement, and normal strength concrete beams with high-strength stirrups may be over-estimated by the Code.

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33

Shaddock, David, and Liang Yin. "Reliability of High Temperature Laminates." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2015, HiTEN (January 1, 2015): 000100–000110. http://dx.doi.org/10.4071/hiten-session3b-paper3b_1.

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Printed circuit boards have been reported to have limited lifetime at 200 to 250°C. Characterization of high temperature laminates for application at 200 to 250°C was conducted to better quantify their lifetime using accelerated testing of key functional parameters. Eight high temperature laminates consisting of 3 material types was evaluated. Life testing was applied for via cyclic life, weight loss, peel strength, and surface insulation resistance. Via lifetime was characterization using Interconnect Stress Test (IST) coupons. Weight loss was measured at intervals during the life of the tests. Peel strength was tested using IPC IPC-TM-650 method 2.4.8c. Weight loss was characterized using isothermal aging. Comparison of lifetime is made between the laminate samples. The non-polyimide laminates exhibited the longer life times than polyimide laminates in most tests except peel strength. Peel strength is the life limiting parameter for the laminates. Parylene HT was found to improve stability in peel strength and weight loss of one PTFE laminate tested.

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34

Hlebová, Stanislava, and Ladislav Pešek. "Toughness of Ultra High Strength Steel Sheets ." Materials Science Forum 782 (April 2014): 57–60. http://dx.doi.org/10.4028/www.scientific.net/msf.782.57.

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Currently only few methods exist for thin steel sheet testing, especially based on fracture mechanics concept. Charpy impact test is one of the most used method for testing notch toughness and fracture behaviors because of the simplicity and the other advantages [. This article deals with toughness testing of automotive ultra high strength steel sheets (UHSS). Several standard types of toughness test that generate data for specific loading conditions and/or component design approaches exist. Two definition of toughness will be discussed: i) Charpy V-notch toughness, method includes joining of thin steel sheets to one compact unit and ii) material (tensile) toughness [. Two steels were used, DP1000 and 1400M of 1,8 mm thickness and two joining techniques: bonding with adhesives and joining with holders. Effect of material, joining technology, structural adhesives, and number of joined plates on the toughness values was quantified at the room temperature. Toughness of steels by the tensile test was added for comparison. Fracture surface was observed using scanning electron microscope analysis.

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35

Gaidhane, Ms Sakshi Harish. "“Testing of High-Performance Concrete using Recycled Aggregates”." International Journal for Research in Applied Science and Engineering Technology 9, no. 9 (September 30, 2021): 495–98. http://dx.doi.org/10.22214/ijraset.2021.37970.

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Abstract: Tons of waste is produced in the world on every day basis which sometimes gets really hard to manage and. The waste from demolished structures is one of them. Recycling waste consume energy and produces pollution that can lead to many adverse effects on the environment and human life. The disposal of waste is also very dangerous for the environment. Using waste materials like waste aggregates, broken bricks, stones and other material in concrete can help in eliminating the waste and save the environment getting polluted. It is also very much economical and encourages green concrete industry. The literature study consists of testing of high-performance concrete using waste aggregates by replacing 100 % natural aggregates. Also, silica fume and plasticizer are used as admixture to obtain more effective results. The tests were carried out on 3, 7 and 21 days of curing. The results were tallied using graphs between comparison of compressive strength and tensile strength of natural and recycled aggregates. The cement and natural aggregates and sand was obtained from a local store in a nearby market. The recycled aggregates were obtained from a nearby demolished building. The quantities were taken in a proper proportion according to IS codes to avoid any defects while constructing the cubes and while curing and performing various tests. Keywords: Recycled Aggregates, Natural Aggregates,Concrete Strength, High Performance Concrete, Properties of Concrete, Cost Effective

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36

Antonov, Dmitri. "Testing nonperturbative Ansätze for the QCD field strength correlator." Physics Letters B 479, no. 4 (April 2000): 387–94. http://dx.doi.org/10.1016/s0370-2693(00)00337-3.

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37

Sathish, S., T. Ganapathy, and Thiyagarajan Bhoopathy. "Experimental Testing on Hybrid Composite Materials." Applied Mechanics and Materials 592-594 (July 2014): 339–43. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.339.

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In recent trend, the most used fiber reinforced composite is the glass fiber composite. The glass-fiber composites have high strength and mechanical properties but it is costlier than sisal and jute fiber. Though the availability of the sisal and jute fiber is more, it cannot be used for high strength applications. A high strength-low cost fiber may serve the purpose. This project focuses on the experimental testing of hybrid composite materials. The hybrid composite materials are manufactured using three different fibers - sisal, glass and jute with epoxy resin with weight ratio of fiber to resin as 30:70. Four combinations of composite materials viz., sisal-epoxy, jute-epoxy, sisal-glass-epoxy and sisal-jute-epoxy are manufactured to the ASTM (American Society for Testing and Materials) standards. The specimens are tested for their mechanical properties such as tensile and impact strength in Universal Testing machine. The results are compared with that of the individual properties of the glass fiber, sisal fiber, jute fiber composite and improvements in the strength-weight ratio and mechanical properties are studied.

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38

Shaddock, David, and Liang Yin. "High Temperature Laminate Characterization." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2014, HITEC (January 1, 2014): 000235–45. http://dx.doi.org/10.4071/hitec-wp21.

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Printed circuit boards have been reported to have limited lifetime at 200 to 250°C. Characterization and modeling high temperature laminates for application at 200 to 250°C was conducted to better quantify the mean lifetime using accelerated testing of key functional parameters. Life testing and model development was applied for via cyclic life, peel strength, and weight loss. Four high temperature laminates consisting of 2 types were evaluated. Via lifetime was characterization using Interconnect Stress Test (IST) coupons. Peel strength was tested using IPC IPC-TM-650 method 2.4.8c. Weight loss was characterized using isothermal aging. Comparison of lifetime is made between the laminate samples.

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Wang, Wei, Xu Liang Xie, Fu Lin Shen, and Xiao Feng Wang. "Numerical Testing for Roof Strength and Rear Wall Strength of High-Top Heavy Truck Cab." Applied Mechanics and Materials 148-149 (December 2011): 198–201. http://dx.doi.org/10.4028/www.scientific.net/amm.148-149.198.

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For design of truck cabin, the survival space must be guaranteed for the safety for driver and front seat passenger in event of crash, which is the legal requirement described in ECE-R29 regulation. In this paper, a finite element model of a high-top cabin for heavy truck was built with commercial code Hypermesh, and a manikin according to ECE-R29 was added to the driver seat. The explicit finite element program Ls-Dyna was used to verify the roof strength and rear wall strength. Analysis and discussion on the deformation of the truck cabin and the survival space of the dummy were presented. The survival space of the cab was proved to be sufficient for the safety of the driver.

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Koiso, Nobushige. "Truncation Strength and High-Temperature Strength Properties of Silicon Nitride after Room Temperature Proof Testing." Transactions of the Japan Society of Mechanical Engineers Series A 59, no. 557 (1993): 144–49. http://dx.doi.org/10.1299/kikaia.59.144.

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Mohtasham Moein, Mohammad, Ashkan Saradar, Komeil Rahmati, Arman Hatami Shirkouh, Iman Sadrinejad, Vartenie Aramali, and Moses Karakouzian. "Investigation of Impact Resistance of High-Strength Portland Cement Concrete Containing Steel Fibers." Materials 15, no. 20 (October 14, 2022): 7157. http://dx.doi.org/10.3390/ma15207157.

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Impact resistance of Portland cement concrete (PCC) is an essential property in various applications of PCC, such as industrial floors, hydraulic structures, and explosion-proof structures. Steel-fiber-fortified high-strength concrete testing was completed using a drop-weight impact assessment for impact strength. One mix was used to manufacture 320 concrete disc specimens cured in both humid and dry conditions. In addition, 30 cubic and 30 cylindrical specimens were used to evaluate the compressive and indirect tensile strengths. Steel fibers with hooked ends of lengths of 20, 30, and 50 mm were used in the concrete mixtures. Data on material strength were collected from impact testing, including the number of post-first-crack blows (INPBs), first-crack strength, and failure strength. Findings from the results concluded that all the steel fibers improved the mechanical properties of concrete. However, hooked steel fibers were more effective than crimped steel fibers in increasing impact strength, even with a smaller length-to-diameter ratio. Concrete samples containing hybrid fibers (hooked + crimped) also had lower compressive strength than the other fibers. Comparisons and analogies drawn between the test results and the static analyses (Kolmogorov–Smirnov and Kruskal–Wallis) show that the p-value of the analyses indicates a more normal distribution for curing in a humid environment. A significant difference was also observed between the energy absorptions of the reinforced mixtures into steel fibers.

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Zhang, Nan, Juan Liao, Tao Zhang, Wen Zhan Ji, Bao Hua Wang, and Dong Hua Zhang. "The Effect of Mineral Admixtures on Mechanical Properties of High Performance Concrete at very Low Temperature." Applied Mechanics and Materials 584-586 (July 2014): 1509–13. http://dx.doi.org/10.4028/www.scientific.net/amm.584-586.1509.

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The effect of very low temperature on high performance concrete (HPC) mechanical properties is studied by using a reasonable testing method. The results show that the compressive strengths of concrete are increasing with lower temperatures. Fly ash (FA), compared to ground granulated blast-furnace slag (GGBFS), is positive to the compressive strength increasing at low temperature. The splitting tensile strengths of concrete appear a maximum at-40°C~-80°C. The compound replacement by GGBFS and FA makes the splitting tensile strength present the extreme value at higher temperature. At very low temperature, the single or compound replacement by mineral admixtures can result in the difference of the relationship between compressive strength and splitting tensile strength, and the degradation of concrete subjected to cold-thermal shocks.

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MODRZEJEWSKI, Patryk, and Jacek JANISZEWSKI. "Methodology for Testing High-Energy Materials Under Low Temperature Conditions." Problems of Mechatronics Armament Aviation Safety Engineering 12, no. 2 (June 30, 2021): 63–74. http://dx.doi.org/10.5604/01.3001.0014.9338.

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The methodology developed for testing gun propellants at low temperatures according to PN-EN ISO 604:2006 is presented in the paper. Brief characteristics are given of the materials tested and the most important static compression test conditions, such as specimen dimensions, deformation velocity and temperature range for selected propellants, i.e. JA-2 and SC. To verify the methodology developed, preliminary strength tests were performed at selected temperatures (25, 0, -25 and -50°C). Tests were carried out on specimens fabricated by shortening the propellant grain to the dimensions required by the reference standard. The results obtained confirmed the expected strength properties for both propellants (tensile strength and brittleness). Due to its chemical composition, the JA-2 propellant is a material of low brittleness even at -50°C. It does not crack completely and only its yield point increases. The results obtained for the JA-2 propellant were consistent with those published in reference literature. The SC propellant proved to be very brittle even at room temperature. At temperatures below 0°C, it fractures completely after reaching the desired deformation. The results obtained confirm that the adopted strength test conditions and the way the tests were prepared and performed enable acquisition of comparable and reliable results. It can be seen by analysing the results for the JA-2 propellant, which are consistent with the data in the available references. In contrast, the tests on the SC propellant proved the validity of strength tests on this type of material. Brittleness of propellant grains is a very undesirable phenomenon. A change in the combustion surface of low explosives caused by the process of propellant grain fracturing can adversely affect the magnitude and course of the pressure pulse, leading to failure of a cartridge chamber or gun barrel.

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Lee, Taegyu, Jaehyun Lee, and Hyeonggil Choi. "Assessment of Strength Development at Hardened Stage on High-Strength Concrete Using NDT." Applied Sciences 10, no. 18 (September 9, 2020): 6261. http://dx.doi.org/10.3390/app10186261.

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This study proposes model formulae for predicting the strength of concrete by analyzing the relationships between the results of nondestructive testing (NDT) methods and the compressive strength of concrete specimens at the hardened stage. Further, NDT of concrete molds and mock-up specimens was conducted using NDT methods (rebound hammer, ultrasonic pulse velocity). The water/cement (W/C) ratios were set to 0.48, 0.41, and 0.33 to achieve concrete strengths within the compressive strength range of 24–60 MPa. The evaluation parameters included the fresh concrete properties, compressive strength (mold and core), temperature history, maturity, rebound value, and ultrasonic pulse velocity. Evaluation results indicated that the reliability of existing models, based on the rebound and ultrasonic pulse velocity, is significantly low on high-strength concrete of 40 MPa or higher, and cannot satisfy the ±20% error range. Consequently, this study proposes a regression equation of the concrete strength based on the experimental rebound and ultrasonic pulse velocity values in a 24–60 MPa range, which offers satisfactory reliability.

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Wedatalla, Afaf M. O., Yanmin Jia, and Abubaker A. M. Ahmed. "Curing Effects on High-Strength Concrete Properties." Advances in Civil Engineering 2019 (March 6, 2019): 1–14. http://dx.doi.org/10.1155/2019/1683292.

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This study was conducted to investigate the impact of hot and dry environments under different curing conditions on the properties of high-strength concrete. The concrete samples were prepared at a room temperature of 20°C and cured under different curing conditions. Some specimens underwent standard curing from 24 h after casting until the day of testing. Some specimens underwent steam curing in a dry oven at 30°C and 50°C after casting until the day of testing. Other specimens were cured for 3, 7, 21, and 28 days in water and then placed in a dry oven at 30°C and 50°C and tested at the age of 28 days, except for the specimens that were cured for 28 days, which were tested at the age of 31 days, to study the effect of curing period on the strength of concrete exposed to dry and hot environments after moist curing. The effects of hot and dry environments on high-strength concrete with different water/binder ratios (0.30, 0.35, and 0.40), using (30%) fly ash for all mixes, and (0%, 5%, and 10%) silica fume with the binder (450, 480, and 520 kg), respectively, were separately investigated, and the effects of curing under different conditions were evaluated by measuring the compressive strength, flexural strength, microhardness, and chloride diffusion and by assessing the concretes’ microstructure. The relationships between these properties were presented. A good agreement was noted between the concrete compressive strength and concrete properties at different temperatures, curing periods, and curing methods.

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Issler, Stephan, Manfred Bacher-Hoechst, and Steffen Schmid. "Fatigue Designing of High Strength Steels Components Considering Aggressive Fuel Environment and Very High Cycle Fatigue Effects." Materials Science Forum 783-786 (May 2014): 1845–50. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.1845.

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Automotive components for injection systems are subjected to load spectra with up to 1E9 load cycles during the expected service life. However, fatigue testing with such a large number of cycles using original components is extremely time-consuming and expensive. A contribution for fatigue reliability assessment is available by the application of specimen testing and the transfer of the results to components including the verification by component spot tests.In this contribution very high cycle fatigue results in laboratory air and in ethanol fuel using notched specimens of high strength stainless steel are discussed. The influence of testing frequency was studied using ultrasonic and conventional test techniques. The validation and transfer of these accelerated testing results to components is one of the main challenges for a reliable fatigue designing.KeywordsVery High Cycle Fatigue (VHCF), automotive components, fuel injection, bio-fuels, corrosion fatigue, testing concepts, fatigue design concepts

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Lee, Ming Gin, Yung Chih Wang, Wan Xuan Xiao, Ming Ju Lee, and Tuz Yuan Huang. "Effect of CO₂ Curing on the Strength of High Strength Pervious Concrete." Key Engineering Materials 846 (June 2020): 207–12. http://dx.doi.org/10.4028/www.scientific.net/kem.846.207.

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This study was conducted to assess the effect of CO2 curing on the compressive strength of high strength pervious concrete. The factors studied to evaluate compressive strength of concrete on CO2 curing pressure, curing time, and age of specimen at testing. Three Aggregate sizes, three CO2 curing pressures, three CO2 curing time, and three testing ages were used in this investigation. The research tried to produce a high strength pervious concrete and use carbon dioxide for curing to find out whether it could enhance the compressive strength. The results show that the compressive strength of the control group increases rapidly and its 90-day compressive strength closed to 60 MPa. The 1-day compressive strength has a major impact after CO2 curing and their strength decreased by about 0% to 50% as compared to the control group. However, it is observed that there is only slight difference in relationship between modulus of elasticity and compressive strength obtained from 100 by 200mm cylinders with CO2 curing.

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Kong, Xu Wen, Long Cui, and Jin Shan Wang. "Experimental Study of Green High Performance Concrete Strength Testing by Rebound Method." Applied Mechanics and Materials 71-78 (July 2011): 737–43. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.737.

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Compare experiment analysis effect of material, slump, carbonation depth on green high performance concrete strength by rebound method, analysis under questions based on microstructure: (1)Basic reason for additives and admixtures etc. impact rebound testing; (2) Significant differences of pumping concrete and plastic concrete; (3) Concrete carbonation depth impact rebound value. Provide the method for improving testing accuracy of green high performance concrete strength testing by rebound method.

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Feng, Sheng, Jun Tu, Shilin Wei, Yongbin Chi, Xu Zhang, and Xiaochun Song. "Ultrasonic testing of axial stress of high strength bolts for bridges." International Journal of Applied Electromagnetics and Mechanics 64, no. 1-4 (December 10, 2020): 685–92. http://dx.doi.org/10.3233/jae-209379.

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The axial stress of high strength bolts for bridges affects the service life directly, it is necessary to measure it regularly. Based on the theory of acoustic elasticity and combination of longitudinal and shear waves, a new theoretical analysis method is proposed. The stressed and non-stressed areas of bolt are separated, and the derived formula only use the flight time and difference of acoustoelastic coefficients to get axial stress. Further, the preload experiments with high strength bolts of grade 8.8S and 10.9S is designed, the experimental results show that the proposed method is applicable to the axial stress of the bridge bolts with any specifications, material and different screwing depth used in this paper, the effect of elastic deformation on the flight time is eliminated, and the measuring error is within 5%.

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SUZUKI, Akihiko, Takashi INAMURA, and Shigekatsu SUGIYAMA. "High Temperature Strength of Sintered Si3N4 after Room Temperature Proof Testing." Transactions of the Japan Society of Mechanical Engineers Series A 57, no. 542 (1991): 2537–42. http://dx.doi.org/10.1299/kikaia.57.2537.

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