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Journal articles on the topic 'Hydrostatic extrusion. Stress concentration'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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1

Topolski, K., H. Garbacz, P. Wiecinski, W. Pachla, and K. J. Kurzydłowski. "Mechanical properties of titanium processed by hydrostatic extrusion." Archives of Metallurgy and Materials 57, no. 3 (2012): 863–67. http://dx.doi.org/10.2478/v10172-012-0095-3.

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The mechanical properties of titanium Grade 2 subjected to the hydrostatic extrusion technique (HE) were investigated. The hydrostatic extrusion technique is a method which refines the titanium grains to a nano-metric size. Compared with coarse grained titanium (CG-Ti), nanocrystalline titanium (NC-Ti) is characterized by a much higher yield stress, tensile strength and microhardness. The yield stress of NC-Ti determined in tensile tests is higher than that measured in compression test. The Young modulus of NC-Ti is slightly lower than that of CG-Ti.
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2

Dryden, John. "Stress concentration in polymer extrusion dies." Acta Mechanica 219, no. 3-4 (2011): 269–79. http://dx.doi.org/10.1007/s00707-011-0450-x.

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3

Li, Yang, and Ren Shu Yuan. "Forming Analysis of AZ80 Magnesium Alloy Thick-Walled Tube Fabricated by Hydrostatic Shrinkage Extrusion." Materials Science Forum 950 (April 2019): 80–84. http://dx.doi.org/10.4028/www.scientific.net/msf.950.80.

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In order to obtain high performance magnesium alloy thick-walled tubes, the magnesium alloy ingot was extruded by hydrostatic shrinkage extrusion technology. Through a series of experiments, it was found that the magnesium alloy tube was not formed in the extrusion ratio that is smaller than 2.11 . Deform-3D software was used to simulate the tube forming process under different extrusion ratios. It was noting that at the condition of the extrusion ratio of 2.11, the equivalent stress and strain of the extruded tube at the fixed sizing zone were obviously unevenly distributed, which was disappe
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4

Wu, Zhi Lin, Duo Xiang Wu, Ren Shu Yuan, Lei Zhao, and Yan Bao Zhao. "Electrochemical Corrosion Behavior of AZ80 Magnesium Alloy Tube Fabricated by Hydrostatic Extrusion." Applied Mechanics and Materials 624 (August 2014): 77–81. http://dx.doi.org/10.4028/www.scientific.net/amm.624.77.

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The corrosion behavior of hydrostatic extruded tube AZ80 magnesium alloy was investigated by polarization curves and electrochemical impedance spectroscopy (EIS) in simulated atmosphere. The results indicated that, the corrosion resistance of the hydrostatic extruded AZ80 magnesium alloy with uneven deformed grains and increased sub-grains were obviously weakened, with larger corrosion current density in the polarization curves and lower corrosion resistances in the electrochemical impedance spectroscopy plots. This was mainly because of the hydrostatic extrusion which made AZ80 magnesium allo
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5

Lee, Jong Sup, Yong Bae Kim, Geun An Lee, Dong Su Bae, Jun Pyo Park, and Sang Mok Lee. "A Study on Hydrostatic Extrusion of Al Duo-Casted Billet." Advanced Materials Research 630 (December 2012): 18–22. http://dx.doi.org/10.4028/www.scientific.net/amr.630.18.

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In this study, a Hydro Co-Extrusion Process of Al-Mn/Al-Si hybrid alloys prepared by electromagnetic duo-casting was investigated. Sleeve of the duo-casted billets is 3003 Al-Mn alloy and core is 4004 Al-Si alloy. It is expected hydrostatic stress during the HCE process enhances formability of materials and minimize any defects in extruded billets due to different material properties between two Al alloys. The duo-casted billet was extruded at temperature of 423K and with extrusion ratio of 5. Finally, the effect of the HCE on microstructure of the billet was investigated by an optical microsc
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6

Zhang, Chao Hui, Yuan Liang, and Fu Chi Wang. "Numerical Simulation of Hydrostatic Extruding Cu/Al Bimetal Clad through Equal-Strain Contour Concave Die." Materials Science Forum 575-578 (April 2008): 792–98. http://dx.doi.org/10.4028/www.scientific.net/msf.575-578.792.

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A bimetal composite material is a variant of the typical composite that is composed of two materials joined at their interface surface. The advantage of clad material is that the combination of different properties of materials can satisfy both the need of good mechanical properties and the demand of user such as electrical properties simultaneously. This paper is concerned with the hydrostatic extrusion process of copper-clad aluminum rod. The commercially available finite element program ANSYS was used to simulate the process of hydrostatic extrusion for Cu/Al bimetal composite through the e
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7

Modławski, Michał, Jacek Nabiałek, and Tomasz Jaruga. "Computer simulation of the load test of an extrusion blow moulded product." MATEC Web of Conferences 157 (2018): 01012. http://dx.doi.org/10.1051/matecconf/201815701012.

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The results of compression "top load" test of an extrusion blow moulded container, performed in ANSYS Mechanical software, were presented. The non-uniform wall thickness of the blown product was considered because the thickness distribution was the result of the first step of the simulation in ANSYS Polyflow - the simulation of the product manufacturing by extrusion blow moulding. The hydrostatic pressure factor was taken into account during the "top load" simulation, because such a test is usually done for filled products. It was found that the biggest stress values occur around the inlet as
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8

Lim, L. G., and F. P. E. Dunne. "Modelling void nucleation and growth in axisymmetric extrusion." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 211, no. 4 (1997): 285–97. http://dx.doi.org/10.1243/0954405971516266.

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Elastic-viscoplastic constitutive equations, with kinematic and isotropic hardening, are employed to model the deformation behaviour of an aluminium alloy in extrusion. Constitutive equations are also employed for void nucleation and growth, which are fully coupled with the deformation behaviour. The material model is employed to investigate the roles of void nucleation and growth in extrusion defect formation. It has been shown that central bursting is a void growth controlled process. The existence of nucleated voids only leads to central burst formation with the existence of appropriate str
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9

Kaganovsky, Yuri S., Lyudmila N. Paritskaya, V. V. Bogdanov, and Witold Łojkowski. "Stress Relaxation Mechanisms during Cd21Ni5 Intermetallic Growth under High Hydrostatic Pressure." Defect and Diffusion Forum 264 (April 2007): 123–32. http://dx.doi.org/10.4028/www.scientific.net/ddf.264.123.

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Stress relaxation processes accompanying intermetallic growth during reactive diffusion between Cd and Ni have been studied by the methods of optical and scanning electron microscopy, provided with X-ray microanalysis. The experiments were carried out with the two-layer Cd-Ni samples at 250 and 280oC under hydrostatic pressures 350-900 MPa. The observed processes have been compared with those occurred at low pressures to demonstrate that the mechanisms of stress relaxation and thus the kinetics of intermetallic growth essentially depend on applied hydrostatic pressure. New mechanisms of stress
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10

Richert, M. W., B. Leszczyńska-Madej, W. Pachla, and J. Skiba. "The Microstructure and Properties of Hydrostatically Extruded Polycrystalline Aluminium Al99.5 / Mikrostruktura I Własności Wyciskanego Hydrostatycznie Polikrystalicznego Aluminium Al99.5." Archives of Metallurgy and Materials 57, no. 4 (2012): 911–17. http://dx.doi.org/10.2478/v10172-012-0100-x.

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The changes of Al99.5 microstructure and properties deformed by hydrostatic extrusion process in the conditions of constant strain rate (1.35×102s-1) and variable deformation (φ = 1.44÷2.85) were investigated. The samples were investigated by means both optical (LM) and transmission electron microscopy (TEM). The size of subgrain was statistically measured by mean chord. To establish the influence of hydrostatic extrusion on the properties of the polycrystalline aluminium Al99.5, the microhardness was measured and the tensile test was performed. The bands and shear bands were the characteristi
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11

Tan, Xian Feng, Cheng Long Yu, and Bao Hua Xie. "Investigation on Finite Element Simulation of ECAE with Variable Back Pressure for 7075 Aluminum Alloy." Advanced Materials Research 904 (March 2014): 36–40. http://dx.doi.org/10.4028/www.scientific.net/amr.904.36.

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The numerical simulation of equal channel angular extrusion (ECAE) with variable back pressure was researched by applying the commercial Deform-3D software, in which choosing the hard deformation materials of 7075 aluminum alloy, and comparing the traditional ECAE without back pressure process. The influence of back pressure on the mean stress and the effective strain rate in the shear deformation zone was studied. The results show that the extrusion force transformation laws were different in both load ways, with the increase of back pressure, extrusion force enhances increasingly, but the fi
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12

Andrada-Chacón, A., V. G. Baonza, and J. Sánchez-Benítez. "Correlation between electrical resistance and defect concentration in graphite under non-hydrostatic stress." Carbon 113 (March 2017): 205–11. http://dx.doi.org/10.1016/j.carbon.2016.11.058.

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13

Jeon, I., Yong Bum Park, Hisahiro Inoue, and Kikuo Kishimoto. "Thermo-Mechanical Stress in Passivated Al-0.5%Cu Thin Films." Key Engineering Materials 261-263 (April 2004): 507–12. http://dx.doi.org/10.4028/www.scientific.net/kem.261-263.507.

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The volume-averaged hydrostatic parts of thermo-mechanical stresses in the metal interconnect line determined by XRD method and finite element method are compared with each other. Two typical shapes of passivated Al-0.5%Cu thin film with SiN or FOx(Flowable Oxide) are selected for this study. For the numerical calculation, the stress concentration effect around the edge of Al-Cu thin film and elastic-plastic behavior of the film following its hardening rule are considered. For the stress obtained by XRD, the experimental results of Park and Jeon[Microelectron. Eng., 69 (2003) p.26] are introdu
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14

Samy, S. N., Ch A. R. Saleh, and A. R. Ragab. "Plastic flow in extrusion and drawing through conical and wedge-shaped dies: Prediction of central bursting." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 220, no. 8 (2006): 1201–10. http://dx.doi.org/10.1243/09544062c21404.

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In this article, the plastic flowfields for extrusion and drawing - for rigid plastic materials forced through conical and wedge-shaped dies - are analysed on the basis of Shield's work. A modification to Shield's analysis is developed to account for the redundant deformation. Solutions for axisymmetric and plane strain flows are given. The total forces estimated for both drawing and extrusion operations are compared favourably with available experimental data. On the basis of the present modified Shield's analysis, expressions for the stresses within the die are then derived. These expression
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15

Gudmundsson, Agust. "Effect of tensile stress concentration around magma chambers on intrusion and extrusion frequencies." Journal of Volcanology and Geothermal Research 35, no. 3 (1988): 179–94. http://dx.doi.org/10.1016/0377-0273(88)90015-7.

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16

Zdunek, Joanna, Pawel Widlicki, Halina Garbacz, Jaroslaw Mizera, and Krzysztof Jan Kurzydlowski. "Influence of Severe Plastic Deformation on the PLC Effect and Mechanical Properties in Al 5XXX Alloy." Solid State Phenomena 114 (July 2006): 171–76. http://dx.doi.org/10.4028/www.scientific.net/ssp.114.171.

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In this work, Al-Mg-Mn-Si alloy (5483) in the as-received and severe plastically deformed states was used. Plastic deformation was carried out by hydrostatic extrusion, and three different true strain values were applied 1.4, 2.8 and 3.8. All specimens were subjected to tensile tests and microhardness measurements. The investigated material revealed an instability during plastic deformation in the form of serration on the stress-strain curves, the so called Portevin-Le Chatelier effect It was shown that grain size reduction effected the character of the instability.
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17

Baragetti, Sergio, and Francesco Villa. "A numerical model to assess the role of crack-tip hydrostatic stress and plastic deformation in environmental-assisted fatigue cracking." Corrosion Reviews 35, no. 4-5 (2017): 343–53. http://dx.doi.org/10.1515/corrrev-2017-0017.

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AbstractTo better understand the mechanics of environmentally assisted cracking, and particularly hydrogen embrittlement, a correct description of the hydrostatic stress field is indispensable. The concentration of hydrogen in the proximity of the crack tip is indeed dependent of the hydrostatic stress effect on the microstructural lattice of the material. The overall parameters of the hydrostatic stress, including peak value, its location, gradient, and distribution size are fundamental to assess the effect on hydrogen distribution near the crack tip, specifically considering hydrogen-enhance
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18

Qu, Sheng Guan, Li Kui Liu, Gang Li, and Xiao Qiang Li. "Cold Extrusion Forming Aluminum Alloy Honeycomb Radiator Mold Structure Optimization." Advanced Materials Research 904 (March 2014): 15–19. http://dx.doi.org/10.4028/www.scientific.net/amr.904.15.

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The quality of the honeycomb radiator structure has a great impact on thermal performance of the LED lamp. In order to make honeycomb radiators structure more uniform and materials fluidity much better; we firstly take use of cold extrusion to form the honeycomb radiator, then it will be machined. In the honeycomb radiator deformation than the larger places where prone to stress concentration, that has a seriously affect on the effect of the radiator forming. Therefore, we optimized the extrusion die, including upper and lower mold prone to stress concentration places create fillet. The result
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19

Müller, Sören, Klaus Mueller, and Walter Reimers. "Modifications of the Extrusion Process of Magnesium Alloys for Improved Mechanical Properties." Key Engineering Materials 367 (February 2008): 9–16. http://dx.doi.org/10.4028/www.scientific.net/kem.367.9.

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In the course of the increasing discussions about a reduction of the CO2 emissions magnesium has gained importance since it is the lightest metal for structural applications. Currently magnesium alloys are almost exclusively used as cast parts in the automotive industry because due to their microstructure extruded magnesium profiles exhibit a strong asymmetry in the mechanical properties under tensile and compressive loading (strength differential effect). In order to improve the mechanical properties a detailed knowledge about the influence of the different extrusion parameters on the microst
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20

Suzuki, Yohei, Ming Yang, and Masao Murakawa. "Optimum Clearance in the Microblanking of Thin Foil of Austenitic Stainless Steel JIS SUS304 Studied from Shear Cut Surface and Punch Load." Materials 13, no. 3 (2020): 678. http://dx.doi.org/10.3390/ma13030678.

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An extrusion-type fine blanking with a negative clearance was proposed by the authors instead of standard fine blanking for creating a full-sheared surface in the micro blanking process. In this study, micro blanking experiments and finite element analyses with narrow, zero and negative clearances are carried out for the optimizing the clearance at which a shear cut surface can be finished with a full-sheared surface with the minimized punch load. Fracture criterion, hydrostatic stress and maximum punch stress for the conditions with various clearances are investigated. As a result, it was cla
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21

Kim, Min Sook, and Young Hak Lee. "Load Carrying and Hydrostatic Performances of Innovative Encapsulated Anchorage System for Unbonded Single Strand." Advances in Civil Engineering 2019 (August 25, 2019): 1–16. http://dx.doi.org/10.1155/2019/7812623.

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A new anchorage system is proposed having a circular bearing plate and curvature between the bearing plate and the anchor head to improve stress concentration. A lid with a screw instead of the grouting method is also proposed to prevent moisture penetration. The details of the anchorage device have been chosen to reduce stress concentration based on the finite element analysis. Static load test, load transfer test, and hydrostatic test of fabricated devices were carried out according to ETAG 013 to evaluate the proposed design. As results, the anchorage slip and stabilization satisfied the re
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22

Wang, Yu, Yuanjian Tong, Bowen Zhang, Hua Su, and Lianghua Xu. "Formation of Surface Morphology in Polyacrylonitrile (PAN) Fibers during Wet-Spinning." Journal of Engineered Fibers and Fabrics 13, no. 2 (2018): 155892501801300. http://dx.doi.org/10.1177/155892501801300208.

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The effects of concentration of dimethyl sulfoxide (DMSO) in the coagulation bath, draw ratio and extrusion speed on surface roughness of polyacrylonitrile (PAN) fibers prepared by wet spinning and dry-jet wet spinning were investigated. The surface roughness was much higher for PAN fibers produced by wet spinning than dry-jet wet spinning. The surface roughness of the fiber increased linearly with increasing concentration of DMSO in the coagulation bath. Higher roughness was observed at higher draw ratios during spinning. The surface roughness of the PAN fibers decreased initially until at 90
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23

Bak-Misiuk, Jadwiga, Andrzej Misiuk, Barbara Surma, Artem Shalimov, and Charalamos A. Londos. "Influence of Neutron Irradiation on Stress - Induced Oxygen Precipitation in Cz-Si." Solid State Phenomena 108-109 (December 2005): 169–74. http://dx.doi.org/10.4028/www.scientific.net/ssp.108-109.169.

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Oxygen precipitation and creation of defects in Czochralski grown silicon with interstitial oxygen concentration 9.4·1017 cm-3, subjected to irradiation with neutrons (5 MeV, dose 1x1017 cm-2) and subsequently treated for 5 h under atmospheric and high hydrostatic pressures (HP, up to 1.1 GPa) at 1270 / 1400 K, were investigated by spectroscopic and X - Ray methods. Point defects created by neutron irradiation stimulate oxygen precipitation and creation of dislocations under HP, especially at 1270 K. The effect of pressure treatment is related to changed concentration and mobility of silicon i
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24

Cheng, Yan, and Li Wen Zhang. "The Optimal Design of Cold Extrusion Die and its Realization." Applied Mechanics and Materials 455 (November 2013): 517–21. http://dx.doi.org/10.4028/www.scientific.net/amm.455.517.

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According to the structure optimization of combined extrusion die, using finite element method to establish parametric model and optimize the combination die, compare the results with the result of Lame formula to prove the correctnesss of finite element method; and adjust the structure of concave of die basing the optimal result, so as to reduce the stress concentration and the maximum equivalent stress value on the concave mould, and thus the life-span of the die is prolonged.
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25

Bruno, Giovanni, R. Fernández, and G. González-Doncel. "The Connection between Micro-Residual Stress and Thermo-Mechanical Treatments in 6061Al-15vol%SiCw Composites." Materials Science Forum 490-491 (July 2005): 539–44. http://dx.doi.org/10.4028/www.scientific.net/msf.490-491.539.

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In this work it is shown how the microscopic residual stress state in 6061Al-15vol%SiCw composites can be modified by plastic strain and by isothermal annealing (the latter, affecting also the precipitation state). The composites were obtained by a powder metallurgical route, which involves extrusion of Al-SiCw powder blends. Neutron diffraction measurements were carried out to determine the RS state. Several degrees of plastic strain, from 1% up to 15% in compression, have been applied ex-situ to the same specimen on several composite materials. Furthermore, the m-RS was also investigated in
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26

Kuhnke, Stefan, Felix Gensch, René Nitschke, Vidal Sanabria, and Soeren Mueller. "Influence of Die Surface Topography and Lubrication on the Product Quality during Indirect Extrusion of Copper-Clad Aluminum Rods." Metals 10, no. 7 (2020): 888. http://dx.doi.org/10.3390/met10070888.

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Copper-clad aluminum rods are usually fabricated using hydrostatic extrusion, since during direct and indirect extrusion fracture of the copper sleeve is difficult to avoid. In this study, different die surface topographies and lubrication conditions were applied to improve the material flow during indirect extrusion of copper-clad aluminum rods. Thus, conic dies with different roughness (polished and sandblasted) and surfaces shapes (fine and coarse grooves) were tested. Additionally, the effects of a wax-graphite-based lubricant as well as a graphite-like carbon (GLC) coating of the die coni
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27

Bazarnik, P., M. Lewandowska, and K. J. Kurzydłowski. "Mechanical behaviour of ultrafine grained Al-Mg alloys obtained by different processing routes." Archives of Metallurgy and Materials 57, no. 3 (2012): 869–76. http://dx.doi.org/10.2478/v10172-012-0096-2.

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The subject of the study were microstructure and mechanical properties of two commercial 5xxx aluminium alloys obtained by Plastic Consolidation (PC) of nanopowders and Hydrostatic extrusion (HE). It has been observed that HE samples exhibit a higher strength whereas PC samples higher ductility. The two types of samples also differ in the type and intensity of serrations on stress-strain curves. The microstructures of samples processed were found to differ significantly in terms of size and shape of grains, grain boundary characteristics, second phase particles content and density of dislocati
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28

Zhang, Jian, Tan Li, Liang Chu, and Da Sen Bi. "The Die Design of Large Diameter Tee Multi-Pass Extrusion Process." Advanced Materials Research 194-196 (February 2011): 2199–203. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.2199.

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Finite element simulation software Deform-3D on large-diameter multi-pass three-way pipe to simulate the extrusion process, the equivalent stress, equivalent strain and load were analyzed. The simulation results show that with the increase of processing pass, deformation process becomes complex, forming more difficult, the value of the state variables are increasing; in the extrusion process, the mold first contact with the billet and extruded convex hull area of the site, compared to other regions, plastic deformation, stress concentration and large, with the mold closed, the force to uniform
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29

TIPPAYASAM, CHAYANEE, and ATTAPHON KAEWVILAI. "Steel-Reinforced Polyethylene Pipe: Extrusion Welding, Investigation, and Mechanical Testing." Welding Journal 99, no. 2 (2020): 52s—58s. http://dx.doi.org/10.29391/2020.99.005.

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This work presents extrusion welding with a square butt joint of V-shaped steel-reinforced polyethylene (SRPE) corrugated pipe. The SRPE pipe was welded in a single pass on the inside of the pipe. The welding temperature was controlled at 190°–200°C. The welding extruder was modified for controlling the travel speed and preheating conditions for welding. A high-density polyethylene (HDPE) rod was used as the welding filler metal, which was inserted into the extruder with a speed of 2.20 m/min. Welding progressed downhill from the overhead position with a travel speed of 3.0 cm/min. The effects
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30

Fang, Xudong, Qiang Kang, Jianjun Ding, Lin Sun, Ryutaro Maeda, and Zhuangde Jiang. "Stress Distribution in Silicon Subjected to Atomic Scale Grinding with a Curved Tool Path." Materials 13, no. 7 (2020): 1710. http://dx.doi.org/10.3390/ma13071710.

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Molecular dynamics (MD) simulations were applied to study the fundamental mechanism of nanoscale grinding with a modeled tool trajectory of straight lines. Nevertheless, these models ignore curvature changes of actual tool paths, which need optimization to facilitate understanding of the underlying science of the machining processes. In this work, a three-dimensional MD model considering the effect of tool paths was employed to investigate distributions of stresses including hydrostatic stress, von Mises stress, normal and shear stresses during atomic grinding. Simulation results showed that a
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31

Haskin, Christine L., Kyriacos A. Athanasiou, Robert Klebe, and Ivan L. Cameron. "A heat-shock-like response with cytoskeletal disruption occurs following hydrostatic pressure in MG-63 osteosarcoma cells." Biochemistry and Cell Biology 71, no. 7-8 (1993): 361–71. http://dx.doi.org/10.1139/o93-054.

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Human osteosarcoma cells, MG-63, were exposed to a hydrostatic pressure shock of 4.0 MPa for 20 min. Changes in subcellular distribution of the cytoskeletal elements and heat shock protein 70 (hsp70) were followed by indirect immunofluorescence and by avidin–biotin–peroxidase protocols. During recovery, total cellular RNA was determined and actin and aldolase mRNA content was followed using reverse transcription – polymerase chain reaction techniques. Hydrostatic pressure caused cell rounding (but not cell death), disruption of microtubules, collapse of intermediate filaments to a perinuclear
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32

Ajiboye, J. S., and S. T. Oyinbo. "Load Prediction for the Extrusion from Circular Billet to Symmetric and Asymmetric Polygons Using Linearly Converging Die Profiles." Key Engineering Materials 622-623 (September 2014): 119–28. http://dx.doi.org/10.4028/www.scientific.net/kem.622-623.119.

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The deformation load is the most important parameter in the press design as it affects the structure and the general integrity of the final product. Therefore, every other parameter such as die shape, friction, type of process (hot or cold), and speed considered in modeling is optimized to cut back on the metal forming load. The flow of metal is largely influenced by the geometry of the die and hence the geometric shape of the tools is the main factor by which an optimum load can be evaluated. In extrusion process the strain distribution, resulting from deformation load, and other important va
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33

Xu, Shu Bo, Cai Nian Jing, Guo Cheng Ren, and Peng Liu. "Finite Element Simulation of Die Design for Warm Equal Channel Angular Extrusion Process of AZ31 Alloy and its Experimental Investigation." Materials Science Forum 667-669 (December 2010): 75–79. http://dx.doi.org/10.4028/www.scientific.net/msf.667-669.75.

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In this paper, a systematic investigation of equal channel angular extrusion/Pressing (ECAE, ECAP) process on the AZ31 alloy and die design is performed by using numerical simulation. The stress distributions on the die were obtained, and general consideration of the die during the whole pressing process was given. The numerical results revealed that effective stress distribution at the corner of the cavity and the extruded load during extrusion processes was effect by channel angles and friction factor. From the simulations, it was found that the closer the die corner is, the higher stress va
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34

Liu, Lei, Zongwei Xu, Dongyu Tian, et al. "MD simulation of stress-assisted nanometric cutting mechanism of 3C silicon carbide." Industrial Lubrication and Tribology 71, no. 5 (2019): 686–91. http://dx.doi.org/10.1108/ilt-03-2019-0096.

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Purpose This paper aims to reveal the mechanism for improving ductile machinability of 3C-silicon carbide (SiC) and associated cutting mechanism in stress-assisted nanometric cutting. Design/methodology/approach Molecular dynamics simulation of nano-cutting 3C-SiC is carried out in this paper. The following two scenarios are considered: normal nanometric cutting of 3C-SiC; and stress-assisted nanometric cutting of 3C-SiC for comparison. Chip formation, phase transformation, dislocation activities and shear strain during nanometric cutting are analyzed. Findings Negative rake angle can produce
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35

Falkenberg, Rainer, Wolfgang Brocks, Wolfgang Dietzel, and Ingo Schneider. "Simulation of Stress-Corrosion Cracking by the Cohesive Model." Key Engineering Materials 417-418 (October 2009): 329–32. http://dx.doi.org/10.4028/www.scientific.net/kem.417-418.329.

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The effect of hydrogen on the mechanical behaviour is twofold: It affects the local yield stress and it accelerates material damage. On the other hand, the diffusion behaviour is influenced by the hydrostatic stress, the plastic deformation and the strain rate. This requires a coupled model of deformation, damage and diffusion. The deformation behaviour is described by von Mises plasticity with pure isotropic hardening, and crack extension is simulated by a cohesive zone model. The local hydrogen concentration, which is obtained from the diffusion analysis, causes a reduction of the cohesive s
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36

Blackburn, S., and H. Böhm. "Silicon carbide fiber-reinforced alumina extrusion." Journal of Materials Research 10, no. 10 (1995): 2481–87. http://dx.doi.org/10.1557/jmr.1995.2481.

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Silicon carbide fiber-reinforced alumina bodies have been produced by ram extrusion. The Al2O3 powder and SiC fiber were milled together to give a dry dispersion of up to 30 vol % fiber which was subsequently mixed to a paste by high shear kneading using hydroxypropylmethylcellulose solutions as the binder phase. Extruded bodies with green densities ranging between 56 and 63% full theoretical density were achieved. The paste flow behavior was characterized using physically based equations which show that for any given moisture content the pressure drop and the constituent paste parameters are
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37

Xue, Feng Mei, Fu Guo Li, Jiang Li, Wen Jun Yu, and Jian Fei Li. "Fracture Analysis of Pipe Sleeve on Extrusion Flare-Less Pipe Joints for Aircraft Hydraulic Pipe." Advanced Materials Research 291-294 (July 2011): 1087–90. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.1087.

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The forming process of aircraft hydraulic pipe joints is investigated through experiments and analyses to solve the cracking problem of pipe sleeve on extrusion flare-less pipe joints. It can be concluded that the internal cause of the fracture failure is connected with the content, shape and distribution of δ-ferrite in 0Cr12Mn5Ni4Mo3Al high strength stainless steel, and the external cause is associated with the bearing behavior in the extrusion-bulging process of pipe sleeve. The crack is formed in the criss-crossing section of δ-ferrite on the function of shear stress in the stress concentr
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38

Shao, Zhi Wen, Xiu Rong Zhu, Jun Wang, et al. "Numerical and Experimental Investigation on Hot Backward Extrusion Process of Mg-Gd-Y-Zn-Zr Magnesium Alloy." Materials Science Forum 788 (April 2014): 127–33. http://dx.doi.org/10.4028/www.scientific.net/msf.788.127.

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The hot backward extrusion process of the Mg-Gd-Y-Zn-Zr magnesium alloy was investigated by both numerical simulation and experiments. An axisymmetric 2D rigid-plastic finite element model (FEM) was established to simulate the material flow during the extrusion process. The shapes of the dies were optimized in order to avoid severe stress concentration and obtain uniform deformation of the workpiece. After hot extrusion, the microstructures of the alloys were obviously refined, and the secondary phases which included many long-period stacking order (LPSO) phases precipitated in the matrix. The
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39

Wang, Xiao Jun, Kun Wu, Ming Yi Zheng, Hai Feng Zhang, Wen Xian Huang, and Xiao Shi Hu. "The Fracture Mechanism of As-Cast and Extruded SiCp/AZ91 Composites Fabricated by Stir Casting." Key Engineering Materials 353-358 (September 2007): 1203–6. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.1203.

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The fracture mechanisms of SiCp/AZ91 composites were investigated by scanning electron microscopy (SEM). For the as-cast composites, the decohesion at SiCp/matrix interface is the main fracture mechanism because of the high stress concentration resulting from the segregation of particles in grain boundaries formed during solidification process. But for the extruded composites, the main fracture mechanism is the particle crack or ductile rupture of the matrix between the particles. So the fracture mechanism of SiCp/AZ91 composites is altered by extrusion because the segregation of particles and
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40

Mezghani, Abderrazak, and Ali Ben Moussa. "Experimental and numerical studies of stress fields of a branched polybutadiene in a flat die." European Physical Journal Applied Physics 95, no. 2 (2021): 21101. http://dx.doi.org/10.1051/epjap/2021210098.

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There is a growing body of laboratory and industrial evidence that the viscoelastic characteristics of molten polymers contribute to improving the efficiency of polymer extrusion molding. Understanding the behavior of molten polymers in manufacturing processes requires the qualitative and quantitative determination of flow kinematics and stress distribution. The optimization of forming processes and final properties of transformed products requires the mastery of high-performance simulation models. So, it is necessary to be able to correctly describe the non-linear rheological behavior of the
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41

Halici, Dilek, Daniel Prodinger, Cecilia Poletti, Daniel Huber, Martin Stockinger, and Christof Sommitsch. "Modelling of the Ductile Damage Behaviour of a Beta Solidifying Gamma Titanium Aluminide Alloy during Hot-Working." Materials Science Forum 783-786 (May 2014): 556–61. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.556.

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Gamma titanium aluminides are innovative materials for high temperature and light weight applications [1]. On the other hand, their hot workability can be limited by failure during hot deformation processes. The prediction of ductile damage in metallic materials can be performed by macromechanical ductile damage criteria [2-4]. If the calculated damage D parameter exceeds a critical value Dc, the material fails. Some macromechanical ductile damage criteria are shown in Table 1, with σ as effective stress, ε as effective strain, σmax as maximum principal stress, σm as hydrostatic stress (mean s
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42

Russell, William D., Nicholas R. Bratton, YubRaj Paudel, et al. "In Situ Characterization of the Effect of Twin-Microstructure Interactions on {1 0 1 2} Tension and {1 0 1 1} Contraction Twin Nucleation, Growth and Damage in Magnesium." Metals 10, no. 11 (2020): 1403. http://dx.doi.org/10.3390/met10111403.

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Through in situ electron backscatter diffraction (EBSD) experiments, this paper uncovers dominant damage mechanisms in traditional magnesium alloys exhibiting deformation twinning. The findings emphasize the level of deleterious strain incompatibility induced by twin interaction with other deformation modes and microstructural defects. A double fiber obtained by plane-strain extrusion as a starting texture of AM30 magnesium alloy offered the opportunity to track deformation by EBSD in neighboring grains where some undergo profuse {1 0 1 2} twinning and others do not. For a tensile loading appl
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43

Raghuveer, HP, M. Hemanth, MS Rani, Chathura Hegde, B. Vedavathi, and D. Chaithra. "An Analysis of the Stress induced in the Periodontal Ligament during Extrusion and Rotation Movements— Part II: A Comparison of Linear vs Nonlinear FEM Study." Journal of Contemporary Dental Practice 16, no. 10 (2015): 819–23. http://dx.doi.org/10.5005/jp-journals-10024-1763.

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ABSTRACT Background Optimal orthodontic forces are those which stimulate tooth movement with minimal biological trauma to the tooth, periodontal ligament (PDL) during and alveolar bone. Among various types of tooth movements, extrusion and rotational movements are seen to be associated with the least amount of root resorption and have not been studied in detail. The mechanical behavior of the PDL is known to be nonlinear elastic and thus a nonlinear simulation of the PDL provides precision to the calculated stress values. Therefore in this study, the stress patterns in the PDL were evaluated w
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44

Fernández, Matilde, Susana Conde, Jesús de la Torre, Carlos Molina-Santiago, Juan-Luis Ramos, and Estrella Duque. "Mechanisms of Resistance to Chloramphenicol in Pseudomonas putida KT2440." Antimicrobial Agents and Chemotherapy 56, no. 2 (2011): 1001–9. http://dx.doi.org/10.1128/aac.05398-11.

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ABSTRACTPseudomonas putidaKT2440 is a chloramphenicol-resistant bacterium that is able to grow in the presence of this antibiotic at a concentration of up to 25 μg/ml. Transcriptomic analyses revealed that the expression profile of 102 genes changed in response to this concentration of chloramphenicol in the culture medium. The genes that showed altered expression include those involved in general metabolism, cellular stress response, gene regulation, efflux pump transporters, and protein biosynthesis. Analysis of a genome-wide collection of mutants showed that survival of a knockout mutant in
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45

Fang, Zong Tao. "Research Progress of Methods to Improve Fatigue Strength of Welded Structures." Applied Mechanics and Materials 217-219 (November 2012): 1614–17. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.1614.

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Fatigue fracture is the main failure form of welded structures. Fatigue strength of welded joints is far below that of base metal under the combined effect of stress concentration, molten slag defects in weld toe and residual tensile stress. Fatigue damage mechanism and main factors that affect fatigue strength of welded structures are analysis and summarized respectively. This paper emphasizes on introducing the research progress of various measures to improve the fatigue properties, including weld toe grinding, TIG dressing, local-heating and local extrusion method, hammering and shot blasti
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46

Kosturek, Robert, Lucjan Śnieżek, Janusz Torzewski, and Marcin Wachowski. "Low Cycle Fatigue Properties of Sc-Modified AA2519-T62 Extrusion." Materials 13, no. 1 (2020): 220. http://dx.doi.org/10.3390/ma13010220.

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This investigation presents the results of research on low cycle fatigue properties of Sc-modified AA2519-T62 extrusion. The basic mechanical properties of the investigated alloy have been established in the tensile test. The low cycle fatigue testing has been performed on five different levels of total strain amplitude: 0.4%; 0.5%; 0.6%; 0.7% and 0.8% with cycle asymmetry coefficient R = 0.1. For each level of total strain amplitude, the graphs of variations in stress amplitude and plastic strain amplitude in the number of cycles have been presented. The obtained results allowed to establish
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47

Raghuveer, HP, M. Hemanth, MS Rani, Chathura Hegde, B. Vedavathi, and D. Chaithra. "An Analysis of the Stress Induced in the Periodontal Ligament during Extrusion and Rotation Movements: A Finite Element Method Linear Study Part I." Journal of Contemporary Dental Practice 16, no. 9 (2015): 740–43. http://dx.doi.org/10.5005/jp-journals-10024-1750.

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ABSTRACT Background Orthodontic tooth movement occurs due to various biomechanical changes in the periodontium. Forces within the optimal range yield maximum tooth movement with minimum deleterious effects. Among various types of tooth movements, extrusion and rotational movements are seen to be associated with the least amount of root resorption and have not been studied in detail. Therefore in this study, the stress patterns in the periodontal ligament (PDL) were evaluated with extrusion and rotational movements using the finite element method FEM. Materials and methods A three-dimensional (
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48

Su, Sheng Rui, Ying Zhang, Hu Jun He, and Xiao Jian Wang. "Numerical Simulation on Forming Dynamics Mechanism and Stress State of Qianning Basin." Applied Mechanics and Materials 226-228 (November 2012): 1458–61. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.1458.

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Two-dimensional finite element model of Qianning basin was built on the basis of depth study on geological structure conditions and of rock mechanical properties in Qianning basin, tectonic stress field characteristics of Qianning fault belt and Qianning basin formation mechanism were inversed. The results show that: (1)A remarkable low stress region is come into being in the central part of Qianning basin, the low stress environment in the strike-slip fault zone has a very important control function for the basin formation. (2)in the rock bridge area of secondary fault belt sinistral right or
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49

Wei, Yong Sen, Sen Kai Lu, and Ping Huang. "Comparison of the Simulation and Experimental Fatigue Endurance Behaviors in T6-Treated Nanosized SiC Reinforced Al Alloy Composite." Advanced Materials Research 690-693 (May 2013): 1762–66. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.1762.

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The fatigue endurance behaviors of SiC nanoparticle reinforced 6061 Al alloy composites (T6-treated SiCnp/6061Al) were simulated by finite element (FE) method with the help of recently developed cyclic viscoplastic constitutive model and its implementation into a FE code Solidworks simulation. The Rice-Tracey damage parameter was used for the crack path calculation did the prediction agree completely with the observed behavior. FE simulation of the materials showed that the composite samples exhibit regular crack propagation behavior. At early stages of loading the hydrostatic stress was low a
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50

Zheng, L., J. M. Luo, Bang Cheng Yang, Ji Yong Chen, and Xing Dong Zhang. "3D Finite Element Analysis of Bone Stress around Distally Osteointegrated Implant for Artificial Limb Attachment." Key Engineering Materials 288-289 (June 2005): 653–56. http://dx.doi.org/10.4028/www.scientific.net/kem.288-289.653.

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Stress shielding, which occurred always around traditional one part implant applied for prosthetic artificial lower limb attachment, would cause osteoporosis and thus result in the loose and extrusion, and then the malfunction of the implant. To improve the structure of the implant, a new type of implant—multi-part implant was developed in this article. Based on CT data and under the maximal load during a normal walking cycle, 3D finite element analysis (FEA) was carried out to analyze the stress of bone around the new implant in three cases of distally truncated femur at high position、middle-
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