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FEM simulation of large deformation of copper in the quasi-constrain high-pressure-torsion setup

机译:准约束高压扭转装置中铜大变形的有限元模拟

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摘要

High pressure-torsion (HPT) technique is widely used to introduce severe plastic deformation in order to obtain ultrafine-grained materials with improved properties or to enhance the phase transformation which may result in an appearance of new phases. The behavior of the copper sample under pressure and torsion in a quasi-constraint configuration is studied using finite element method (FEM). A complete system of equations for small elastic and large plastic deformations and rotations is presented. Contact friction conditions include combined Coulomb and plastic sliding. The evolution of the distribution of fields of components of the stress tensor, hydrostatic pressure, and equivalent plastic strain are studied. The effects of the critical strain for saturation of strain hardening, m, and different friction conditions are investigated. Strong heterogeneity of the plastic strain both along the radius and thickness of the sample is found, which is not well described by known approximate expressions. Torque-rotation angle response of the sample is not sensitive to the value of m but strongly depends on the friction coefficient between anvil and flash. The main conclusion is that the value of m obtained in literature from HPT (from 4.8 to 20) is highly overestimated and m = 1.57 obtained in a homogeneous compression test should be used.
机译:高压扭转(HPT)技术被广泛用于引入严重的塑性变形,以获得具有改善的性能的超细颗粒材料或增强可能导致出现新相的相变。使用有限元方法(FEM)研究了铜样品在准约束条件下在压力和扭转下的行为。提出了一个用于小弹性和大塑性变形和旋转的完整方程组。接触摩擦条件包括库仑和塑料滑动的组合。研究了应力张量,静水压力和等效塑性应变的分布场的演变。研究了临界应变对应变硬化饱和度,m和不同摩擦条件的影响。发现沿着样品的半径和厚度的塑性应变都具有很强的异质性,这不能通过已知的近似表达式很好地描述。样品的扭矩-旋转角响应对m值不敏感,但在很大程度上取决于砧座和毛边之间的摩擦系数。主要结论是,文献中从HPT获得的m值(从4.8到20)被高估了,应该使用在均质压缩试验中获得的m = 1.57。

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