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A finite element methodology to incorporate kinematic activation of discrete deformation twins in a crystal plasticity framework

机译:将离散形变孪晶的运动学激活纳入晶体可塑性框架的有限元方法

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A finite element framework is presented in which grains within a polycrystalline microstructure are pre-discretized into lamellar regions that become candidates to deform by twinning. This enables the mapping of the motion due to twinning on geometrically proper regions. At some point in the loading of the polycrystal, a twin is triggered, at which point the nodes within a twin region are rapidly mapped to their twinned location, the region's crystal lattice is reoriented, and the remainder of the body deforms by means of crystallographic slip to enforce mechanical equilibrium. The framework allows for both the onset of twinning and twin growth, and is intended to serve as a test bed for investigating models proposed for these phenomena. In this paper, the framework is described and simulations are performed to demonstrate its ability to handle the large, fast deformation of twinning within a targeted grain of a polycrystalline aggregate. Various simulations are performed, where the initial twin width and the point of twin activation in the loading history are parameterized. Deformation fields in and around the twinned region are inspected after a twinning event, and changes in local stress states are discussed in light of global and local energetic metrics. (C) 2019 Elsevier B.V. All rights reserved.
机译:提出了一个有限元框架,其中多晶微观结构中的晶粒被预先离散为片状区域,这些区域成为通过孪晶变形的候选对象。这使得由于在几何上适当的区域上孪生而导致的运动映射成为可能。在多晶加载的某个时刻,触发了孪晶,此时,孪晶区域内的节点迅速映射到其孪晶位置,该区域的晶格重新定向,并且其余主体通过晶体学变形滑动以增强机械平衡。该框架允许孪生和孪生生长的开始,并且旨在用作研究针对这些现象提出的模型的测试平台。在本文中,对框架进行了描述,并进行了仿真,以证明其处理多晶聚集体目标晶粒内孪晶的快速变形的能力。执行各种模拟,其中将加载历史中的初始孪晶宽度和孪晶激活点参数化。在孪生事件之后,检查孪生区域内和周围的变形场,并根据全局和局部能量度量讨论局部应力状态的变化。 (C)2019 Elsevier B.V.保留所有权利。

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