Relevant bibliographies by topics / Extrusion aggregate

Academic literature on the topic 'Extrusion aggregate'

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Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Extrusion aggregate"

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Rushing, Todd S., Ghassan Al-Chaar, Brian Andrew Eick, Jedadiah Burroughs, Jameson Shannon, Lynette Barna, and Michael Case. "Investigation of concrete mixtures for additive construction." Rapid Prototyping Journal 23, no. 1 (January 16, 2017): 74–80. http://dx.doi.org/10.1108/rpj-09-2015-0124.

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Purpose This paper aims to qualify traditional concrete mixtures for large-scale material extrusion in an automated, additive manufacturing process or additive construction. Design/methodology/approach A robust and viable automated additive construction process must be developed that has the capability to construct full-scale, habitable structures using materials that are readily available near the location of the construction site. Accordingly, the applicability of conventional concrete mixtures for large-scale material extrusion in an additive construction process was investigated. A qualitative test was proposed in which concrete mixtures were forced through a modified clay extruder and evaluated on performance and potential to be suitable for nozzle extrusion typical of additive construction, or 3D printing with concrete. The concrete mixtures were further subjected to the standard drop table test for flow, and the results for the two tests were compared. Finally, the concrete mixtures were tested for setting time, compressive strength and flexural strength as final indicators for usefulness in large-scale construction. Findings Conventional concrete mixtures, typically with a high percentage of coarse aggregate, were found to be unsuitable for additive construction application due to clogging in the extruder. However, reducing the amount of coarse aggregate provided concrete mixtures that were promising for additive construction while still using materials that are generally available worldwide. Originality/value Much of the work performed in additive manufacturing processes on a construction scale using concrete focuses on unconventional concrete mixtures using synthetic aggregates or no coarse aggregate at all. This paper shows that a concrete mixture using conventional materials can be suitable for material extrusion in additive construction. The use of conventional materials will reduce costs and allow for additive construction to be used worldwide.
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Demiriz, Levent, and EbruHazar Bodrumlu. "Severe unintentional extrusion of mineral trioxide aggregate during apexification." Indian Journal of Dental Research 28, no. 3 (2017): 341. http://dx.doi.org/10.4103/ijdr.ijdr_365_16.

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MORI, AKIKO, and YASUNORI MATSUFUJI. "INFLUENCES OF FINE AGGREGATE GEOMETRY ON EXTRUSION CHARACTERISTICS OF MORTARS." Journal of Structural and Construction Engineering (Transactions of AIJ) 397 (1989): 12–18. http://dx.doi.org/10.3130/aijsx.397.0_12.

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El Cheikh, K., S. Rémond, N. Khalil, and G. Aouad. "Numerical and experimental studies of aggregate blocking in mortar extrusion." Construction and Building Materials 145 (August 2017): 452–63. http://dx.doi.org/10.1016/j.conbuildmat.2017.04.032.

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Demiriz, Levent, and Ebru Hazar Bodrumlu. "Retrospective Evaluation of Healing of Periapical Lesions after Unintentional Extrusion of Mineral Trioxide Aggregate." Journal of Applied Biomaterials & Functional Materials 15, no. 4 (January 2017): e382-e386. http://dx.doi.org/10.5301/jabfm.5000359.

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Background During the apexification procedure for teeth with open apices, mineral trioxide aggregate (MTA) may be unintentionally extruded. The aim of the present study was the retrospective evaluation of the healing of periapical lesions in permanent incisor teeth with open apices after the unintentional extrusion of MTA. Methods The clinical and radiographic records of 55 maxillary permanent central teeth treated by MTA apexification were evaluated. Filled teeth with unintentionally extruded MTA were selected as group 1 (n = 21), whereas the teeth with no MTA extrusion were selected as group 2 (n = 34). For each tooth, the clinical and radiographic records from a 3-year follow-up were investigated. Results Complete healing (CH) was observed in 19 teeth (90.4%) in group 1, whereas the same type of healing was observed in all 34 teeth (100%) in group 2 (p>0.05). At the 6-month follow-up appointment, 25 teeth (73.5%) showed CH in group 2, whereas 15 teeth (71.4%) showed CH at the 1-year follow-up in group 1 (p<0.001). At the end of the 3-year follow-up period, the amount of MTA extrusion was reduced in 17 teeth (85%) (p<0.05), whereas it was almost absent in 2 teeth (10%). Conclusions The unintentional extrusion of MTA does not prevent the healing of periapical lesions, but may be a delaying factor for periapical healing.
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Bartnicki, J. "Numerical Analysis of Rolling Extrusion Process of a Hollow Hub / Analiza Numeryczna Procesu Przepychania Obrotowego Piasty Drążonej." Archives of Metallurgy and Materials 57, no. 4 (December 1, 2012): 1137–42. http://dx.doi.org/10.2478/v10172-012-0127-z.

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This paper presents the results of numerical calculations of rolling extrusion process of a hollow hub. Simulations were made by means of software Deform 3D in three dimensional state of strain. Distributions of effective stress, effective strain and damage criterion in the rolled extruded product were analyzed. Verification of metal flow during process allowed to design tools for experimental verification in PO-2 laboratory rolling - extrusion aggregate. For these needs also process force parameters were calculated.
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Watanabe, Ikumu. "Two-Scale Finite Element Analysis of Equaled Channeling Angular Extrusion of Polycrystalline Metal." Materials Science Forum 783-786 (May 2014): 2713–19. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.2713.

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A two-scale finite element analysis method based on a micro-macro decoupled scheme is applied to an equaled channeling angular extrusion. At first, the macro-scale finite element analysis for one process of an equaled channeling angular extrusion is carried out with a non-liner explicit method to handle the contact and friction between die and bullet. Using the deformation history at a macroscopic material point in this process, the micro-scale finite element analysis is conducted for the multiple processes with a single crystal plasticity and a nonlinear implicit method. As the results, the deformation process of the polycrystalline aggregate during the equaled channeling angular extrusion is numerically reproduced.
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Nosrat, A., M. H. Nekoofar, B. Bolhari, and P. M. H. Dummer. "Unintentional extrusion of mineral trioxide aggregate: a report of three cases." International Endodontic Journal 45, no. 12 (June 30, 2012): 1165–76. http://dx.doi.org/10.1111/j.1365-2591.2012.02082.x.

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Bartnicki, Jarosław. "Numerical Analysis of Feed Rate Influence on Hollow Hub Shape during Rolling Extrusion Process." Key Engineering Materials 572 (September 2013): 323–26. http://dx.doi.org/10.4028/www.scientific.net/kem.572.323.

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This paper presents the results of numerical calculations of rolling extrusion process of a hollow hub. Due to the necessity of flanges manufacturing at both sides of the product, in the analyzed process of rolling extrusion, as additional tool limiting axial metal flow a rear bumper was implemented [1,. Numerical calculations of the hub forming process were conducted basing on finite element method, applying software Deform3D v.X in conditions of three dimensional state of strain. The obtained small shape faults, in the form of characteristic triangulation and small changes of the hub walls thickness, show that it is possible to conduct the further research works of experimental character, with the application of modernized aggregate for the rolling extrusion process PO-2.
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Volpe, Stelladriana, Andrea Petrella, Valentino Sangiorgio, Michele Notarnicola, and Francesco Fiorito. "Preparation and characterization of novel environmentally sustainable mortars based on magnesium potassium phosphate cement for additive manufacturing." AIMS Materials Science 8, no. 4 (2021): 640–58. http://dx.doi.org/10.3934/matersci.2021039.

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<abstract> <p>The "Digital Transition" of the building sector and in particular the concrete 3D printing is profoundly changing building technologies and construction processes. However, the materials engineering is still a challenge for the research of even more effective and performing 3D printable concrete. In this context, we analysed magnesium potassium phosphate cement (MKPC) performance as an innovative cementitious material in terms of sustainability and possibility of its use in extrusion-based 3D concrete printing (3DPC). Starting from common formulations present in literature, we discussed the relationship between water to binder ratio and workability in two different quantities of retarders. Some mix compositions were also prepared by replacing sand with rubber aggregates or glass aggregates with the aim of creating lightweight aggregate-based mortars. In addition, the fly ash (FA), a widely material used (but that will not be available in the next few years), was replaced with silica fume (SF). We found that two formulations (samples 2 and 7) show rheological requirements and compressive strengths at 90 min of respectively about 2 MPa and 3 MPa, which are deemed to be suitable for 3D printing processes. Moreover, in sample 7, the use of the expanded recycled glass as aggregate opens new possibilities for reducing the carbon footprint of the process.</p> </abstract>
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Dissertations / Theses on the topic "Extrusion aggregate"

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Коротка, Валерія Олександрівна. "Екструзійний агрегат з модернізацією черв‘яка." Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2021. https://ela.kpi.ua/handle/123456789/41797.

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Метою розробки і проектування є аналітичні, проектувальні розрахунки з використанням відомих методів, нормативних документів, комп’ютерних програм. Проектування та розробка екструзійного агрегату виконана на основі патентних досліджень, вивчення науково-технічної літератури, інженерно-технічних розрахунків та аналітичного огляду. Виконане наступне: -проведені інженерні розрахунки для проектування та розробки ееструдера,згідно з технічним завданням; -вивчено принцип роботи екструзійного агрегату для плівкового пластикату,проаналізовані технічні параметри та характеристики; -на основі патентного дослідження модернізовано черв’як екструзійного агрегату; -розроблено та спроектовано екструзійний агрегат з модернізованим черв’яком для плівкового пластикату;
The purpose of development and design is analytical, design calculations using known methods, regulations, computer programs. The design and development of the extrusion unit is performed on the basis of patent research, study of scientific and technical literature, engineering and technical calculations and analytical review. The following was done: -engineered calculations for the design and development of eestruder, in accordance with the terms of reference; - the principle of operation of the extrusion unit for film plastic was studied, technical parameters and characteristics were analyzed; - on the basis of patent research the worm of the extrusion unit is modernized; - developed and designed an extrusion unit with an upgraded worm for film plastic;
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LIN, YU-CHEN, and 林育晟. "Effect of drawing and annealing process on aggregate structure and properties of EVOH、Nylon6、LDPE co-extrusion multilayer film." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/p9zq59.

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碩士
國立臺灣科技大學
材料科學與工程系
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In this study, Ethylene vinyl alcohol、Low-density polyethylene and Polyamide6 is used as raw materials, using the Melt flow tester and the MCR rheometer to characterize the flow properties and rheological behavior and choose the proper materials to extrude EVOH/ Nylon6/LDPE multilayer film by three layer co-extruder . The effects of drawing speed 、draw ration、drawing temperature and annealing process on the crystallinity and thermal property of the film were studied with Differential scanning calorimeter 、Dynamic mechanical analysis and Wide angle x-ray diffraction；and the barrier properties were measured by Water Vapor Transmission Tester and Oxygen permeation analyzer. The results showed that the tensile strength rised but the elongation droped with the increasing of drawing rate, and the crystallinity droped,too. The tensile test of heat drawing temperature shows the reverse trend with drawing rate and heat setting temperature should be controlled in the range of 55℃~75℃.The crystallinity increased with the drawing ratio .From the result of DSC and DMA ,the annealing temperature increased ,the crystallinity also ascending. The crystallization process nearly accomplished with the condition of 100℃ for 60 seconds. The tensile strength of  machine direction is higher than transverse direction，and lower for elongation, and from the evidence of DSC the crystallinity of machine direction is larger than transverse direction. There is a positive relation between crystallinity and barrier property ,the barrier ability increased with the crystallinity.
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Book chapters on the topic "Extrusion aggregate"

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Zagorodnyuk, L. H., V. D. Ryzhikh, D. S. Makhortov, and D. A. Sumskoy. "Method of Extrusion Granulation of Aggregates for the Preparation of Filling Mixtures." In Lecture Notes in Civil Engineering, 22–28. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-72910-3_4.

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Satpute, Archana Bhaskar, and Pradnya Sunil Kumar Nagmode. "The Effect of Mineral Trioxide Aggregate on the Periapical Tissues after Unintentional Extrusion beyond the Apical Foramen: Case Series." In Highlights on Medicine and Medical Science Vol. 12, 163–70. Book Publisher International (a part of SCIENCEDOMAIN International), 2021. http://dx.doi.org/10.9734/bpi/hmms/v12/3048d.

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Conference papers on the topic "Extrusion aggregate"

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Salilkumar, Vandana A., and Narayan K. Sundaram. "On the Application of Arbitrary Lagrangian-Eulerian and Remeshing Techniques to Simulate Certain Machining and Deformation Processing Operations." In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-2957.

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Abstract Metal cutting and deformation processing operations provide some of the most challenging problems for modeling and simulation in computational plasticity. These challenges include, but are not limited to, extreme plastic deformation, challenges in constitutive and interfacial friction modeling, microstructural effects, mechanical and thermoplastic instabilities, multiphysics effects due to cutting fluid and high temperatures, and are generally computationally intensive. Despite considerable progress in each of these fronts, there is scope to expand the envelope of simulations that capture the deformation physics while being computationally feasible. Moreover, even conventional standard FEA codes can be leveraged for modeling and simulation in more effective ways. In this work, we present three challenging scenarios for modeling, namely large strain extrusion machining (LSEM), forming using a flat punch, and cutting of inhomogeneous metal, using a mix of Arbitrary Lagrangian Eulerian (ALE), conventional Lagrangian FE, and remeshing techniques. Some of these simulations are ‘standard’, while others are first-in-class, and we discuss both specific and general modeling issues that must be considered to obtain good quality solutions. Specific mechanics insights gleaned from each of these case studies are also presented, ranging from the influence of friction in deep punch indentation to the selection of the chip thickness ratio in LSEM. The last part of this work focuses on problems that arise in the simulation of polycrystalline aggregate cutting, and the progress made in addressing them.
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Ding, Houzhu, Enyan Dai, Filippos Tourlomousis, and Robert C. Chang. "A Methodology for Quantifying Cell Density and Distribution in Multidimensional Bioprinted Gelatin-Alginate Constructs." In ASME 2017 12th International Manufacturing Science and Engineering Conference collocated with the JSME/ASME 2017 6th International Conference on Materials and Processing. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/msec2017-2853.

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Bioprinted tissue constructs are enabled by microextrusion-based co-printing of cells and hydrogel materials. In this paper, a gelatin-alginate hydrogel material formulation is implemented as the bio-ink towards a 3D cell-laden tissue construct. However, of fundamental importance during the printing process is the interplay between the various parameters that yield the final cell distribution and cell density at different dimensional scales. To investigate these effects, this study advances a multidimensional analytical framework to determine the spatial variations and temporal evolution of cell distribution and cell density within a bioprinted cell-laden construct. In the one dimensional (1D) analysis, the cell distribution and cross-sectional shape for a single printed fiber are observed to be dependent on the process temperature and material concentration parameters. This is illustrated by the reliable fabrication and image line profile analysis of the fiber prints. Round fiber prints with a measured width of 809.5±52.3 μm maintain dispersive cells with a degree of dispersion (Dd) at 96.8 % that can be achieved at high relative material viscosities under low temperature conditions (21 °C) or high material concentrations (10 % w/v gelatin). On the other hand, flat fiber prints with a measured width of 1102.2±63.6 μm coalesce cells towards the fiber midline with Dd = 76.3% that can be fabricated at low relative material viscosities under high temperature (24 °C) or low material concentrations (7.5 % w/v gelatin). In the 2D analysis, a printed grid structure yields differential cell distribution whereby differences in localized cell densities are observed between the strut and cross regions within the printed structure. At low relative viscosities, cells aggregate at the cross regions where two overlapping filaments fuse together, yielding a cell density ratio of 2.06±0.44 between the cross region and strut region. However, at high relative viscosities, the cell density ratio decreases to 0.96±0.03. In the 3D analysis, the cell density attributed to the different layers is studied as a function of printing time elapsed from the initial bio-ink formulation. Due to identifiable gravity and extrusion process-induced effects, the cell distribution within the original bio-ink cartridge or material reservoir is altered over time to yield initial quantitative increases in the cell density over the first several printed layers, followed by quantitative decreases in the subsequent printed layers. Finally, in the time-dependent analysis, the evolution of cell density and the emergence of material degradation effects is studied over a time course study. Variable initial cell densities (0.6 × 106 cells/ml, 1.0 × 106 cells/ml, and acellular control group) printed and cross-linked into cell-laden constructs for the 48 hr time course study exhibit a time-dependent increase in cell density owing to proliferation within the constructs that are presumed to accelerate the degradation rate.
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Guilhem, Yoann, Jean-Michel Stéphan, François Curtit, Georges Cailletaud, and Stéphanie Basseville. "Numerical Study of the Short Crack Initiation in Polycrystalline Aggregates." In ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78164.

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Fatigue life of polycrystalline materials is mainly governed by the early stages of surface short cracks. Initiation and micro-propagation phases, which represent from 50% to 80% of total component life, are experimentally proven to depend on material microstructure. The aim of this numerical study is to highlight the influence of local parameters (e.g. crystallographic orientation) on the short crack initiation. Finite element computations are performed with a crystal plasticity model. The investigations are carried out on 316L Stainless Steel with different fatigue loadings and various surface roughnesses. A qualitative study of volumetric strain localization is carried out to distinguish uniaxial and biaxial results. The slip plane activity in surface grains is characterized. Many configurations are tested to provide a statistical point of view. Results revealed the strong vulnerability of surface grains with a high Schmid factor on systems that produce extrusions. It is also demonstrated that taking account of geometrical singularities can strongly change the plastic strain localization due to crystal orientation.
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Talwar, Brijpal Singh, Kambiz Chizari, Shuangzhuang Guo, and Daniel Therriault. "Investigation of Carbon Nanotubes Mixing Methods and Functionalizations for Electrically Conductive Polymer Composites." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-39970.

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The growing popularity of Poly lactic acid (PLA) is related to its biocompatibility, good mechanical properties, and its synthesis from renewable resources. PLA can be compounded with electrically conductive fillers (e.g., carbon nanotubes (CNTs)) to form carbon polymer composites (CPC). These fillers provide the conductive functionality by forming percolative paths. Featuring very low weight densities, CPCs have the potential to replace metals in the electronic industry if they exhibit similar electrical conductivities. The current challenges being faced during the mixing of CNTs in a polymer matrix are the formation of aggregates due to the strong van der Waals forces and the breakage of the CNTs during dispersion. In this study, we compare: (1) two fabrication methods to create CPCs (i.e., solution mixing by sonication and extrusion) and (2) effects of various CNT functionalization techniques (i.e., acid and plasma treatments) on the conductivity of the CPCs. First, the composites comprising of 30% PLA by weight in Dichloromethane (DCM) and CNTs in different concentrations (up to 5wt.%) are fabricated by two step sonication method (i.e., dissolving PLA in DCM and then dispersing the CNTs in the polymer solution). Second, CPCs are fabricated using a micro twin screw extruder operating at 180°C. To verify the effects of functionalization of the CNTs on the conductivity of composites, the CNTs are functionalized via three methods: - HNO3 acid functionalization, 3:1 ratio HNO3 + H2SO4 acid (stronger) functionalization and N2 plasma functionalization. CPC fibers are drawn using the solvent-cast printing method. These fibers are then tested for their electrical conductivity using the two probe method. The maximum electrical conductivity is showed by the 5% CNT concentration samples at 3.97 S/m and 25.16 S/m for the CPC fibers obtained via the solution blend and the extrusion methods, respectively. Regarding the functionalized CNTs, conductivity measurements show a negative effect of the CNTs functionalization on the electrical properties of the CPC.
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Buis, Jennifer J., John W. Sutherland, and Fu Zhao. "Unit Process Life Cycle Inventory Models of Hot Forming Processes." In ASME 2013 International Manufacturing Science and Engineering Conference collocated with the 41st North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/msec2013-1054.

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Life cycle assessment (LCA) is a widely used tool to evaluate the environmental profile of a product or process, and can serve as a starting point for product and process improvement. Using LCA to support sustainable product design and sustainable manufacturing has recently attracted increasing interest. Unfortunately, the available life cycle inventory databases have very limited coverage of manufacturing processes. To make matters worse, the available datasets are either highly aggregated or consider only selected processes and process conditions. In addition, in the case of the latter, the data provided may be based on limited measurements or even just estimates. This raises questions on applicability of these databases to manufacturing process improvement where different operating parameters and conditions are adopted. Recently a novel methodology called “unit process life cycle inventory” or “uplci” has been proposed to address these issues, and models for several machining processes (e.g., turning, milling, and drilling) and joining (e.g, submerged arc welding) have been developed. This paper follows the uplci approach and develops models for a series of hot forming processes, including billet heating, performing, and indirect extrusion. It is shown that the model predictions on energy consumption are in good agreement with data measured on a production line. For hot forming processes, the results suggest that billet heating dominates the overall energy consumption and the carbon footprint relative to the deformation steps.
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Bin, Zhang, Qiao Su-kai, Hao Qing-jun, Huang Hong-zhi, Ding Ming, and Liu Pan. "Development of Shearing Device for Reducing the Storage Volume of the Spent Fuel Associated Assemblies in Nuclear Power Plants." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-67447.

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With the continuous running of the nuclear power plants, a great deal of unavailable spent fuel associated assemblies were and will be produced in the aggregates of the nuclear power plants, which are usually stored in the spent fuel storage pool and occupy lots of spent fuel storage racks, making the spent fuel storage facility of the nuclear power plants face the risk of being filled up. Therefore, it drives the nuclear power plants to seek a new method to increase the spent fuel storage capacity. In order to increase the storage capacity of the spent fuel storage racks, a shearing device is proposed to shear the rods and base plates (or spider assemblies) of the spent fuel associated assemblies, reducing the storage volume of the spent fuel associated assemblies and reducing the amount of the occupied spent fuel storage racks. The technology of water-hydraulic shear is applied to carry the shear process through underwater cold extrusion, effectively ensuring the integrity of the rod structure and avoiding the pollution caused by radioactive substances. Besides, no swarf would be produced to pollute the spent fuel storage pool. Through the finite element calculation and confirmation on the spot, it is verified that the bearing requirement of the fixed blade (the key assembly unit) of the shearing device is met during the relevant disassembling process. Currently, the shearing device has been successfully applied to reducing the storage volume of the spent fuel associated assemblies in LingAo Nuclear Power Plant. Therefore, the shearing device is of certain promoting and reference value.
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