Modelling of High Pressure Torsion using FEM
Modelling of High Pressure Torsion using FEM
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DOI：
10.1016/j.proeng.2017.10.911
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
R. Kulagin;Y. Beygelzimer;Y. Ivanisenko;A. Mazilkin;H. Hahn
中科院分区：
文献类型：
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作者：
R. Kulagin;Y. Beygelzimer;Y. Ivanisenko;A. Mazilkin;H. Hahn
高压扭转（HPT）是历史上第一个也是目前最常见的严重塑性变形（SPD）过程。HPT用于在金属和合金中生产纳米晶结构，以及用于粉末的冷焊。HPT处理的结果由变形下材料的流动运动学和应力状态决定。P.Bridgman提出了一个简单的模型，用于在HPT期间对样品中的剪切应变进行初始评估。最近的一些研究表明，在HPT过程中的真实塑性流动可以显着不同于简单的模型。在我们的报告中，我们提出了HPT过程中不同类型的流动的有限元研究结果。我们提出了一个假设，即在SPD过程中的旋涡的形成是由于在变形下的材料中的简单剪切的局部阻塞。
High Pressure Torsion (HPT) is historically the first and is currently most common process of the severe plastic deformation (SPD). HPT is used for producing nanocrystalline structures in metals and alloys, as well as for cold welding of powders. The result of the HPT treatment is determined by the flow kinematics and the stress state of a material under deformation. P. Bridgman proposed a simple model for the initial assessment of shear strain in the sample during HPT. A number of recent investigations show that the true plastic flow during HPT can differ significantly from the simple model. We present in our report results of the FEM investigation of different types of flow during HPT. We propose a hypothesis that the vortex formation during the SPD process is caused by the local blocking of simple shear in a material under deformation.