Question

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Bulk nano-structurcd materials processed by methods of severe plastic deformation (SPD) have attracted the growing interest of researchers in materials science. The high pressure torsion straining (HPT) process, which involves large shear and compressive plastic deformation, has been the subject of intensive study in recent years due to its capability of producing fully dense samples having an ultra fine grain size. Because the evolution of the rnicrostructures and mechanical properties of plastically deformed materials are directly related to the amount of plastic deformation, the understanding of the phenomenon associated with the strain development is very important. In this process, knowledge of the internal stress and strain distribution is fundamental to the determination of the optimum process conditions for a given material, such as the number of rotations, the rotational speed and the temperature. In this study, the commercial elasto-plastic finite element method (ABAQUS) is applied to obtain a better understanding of the plastic deformation behaviour of the work piece during the torsion straining process. The simulated geometry (thickness distribution) of the work piece is compared with previous experiment data obtained using copper specimens with different number of rotations. The thickness of the work piece decreased with distance from the centre because of the higher compressive plastic stress state in the centre region compared to the outer part during the loading stage and the elastic recovery during unloading. c 2001 Elsevier Science BA¡¯. All rights reserved.
Keywords: High pressure torsion process; Finite element analysis; Copper; Stress distribution

Answer 1

方法处理的疏松nano-structurcd材料严厉塑料变形(SPD)吸引了研究员的增长的兴趣在材料学。 劳损(HPT)过程的高压扭力，介入大剪和压缩塑料变形，是密集的研究主题近年来由于它的生产充分地密集的样品的能力有超微粒的大小。 由于rnicrostructures的演变和塑料被扭屈的材料机械性能直接地与相当数量塑料变形有关，对现象的理解与张力发展相关是非常重要的。 在这个过程，内应力和张力发行的知识对最宜的处理条件的决心是根本的为特定材料，例如自转的数量，旋转的速度和温度。 在这项研究，在扭力straining过程期间，运用商业弹塑性的有限元法(ABAQUS)获得对工作片断的塑料变形行为的更好的理解。 被模仿的几何(厚度发行)工作片断与使用铜标本得到的早先实验数据比较以自转的另外数字。 工作片断的厚度在中心区域减少了以从中心的距离由于更高的压缩塑料重音状态与外部在装货阶段期间和有弹性补救比较在卸载期间。 c 2001年Elsevier科学BA ¡ ¯。 版权所有。
主题词： 高压扭力过程; 有限元素分析; 铜; 重音发行

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Answer 2

不知道

Answer 3

晕