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Elastic/crystalline-viscoplastic finite element analysis of dynamic deformation of sheet metal

机译：钣金件动态变形的弹性/结晶粘塑性有限元分析

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Describes the development of a dynamic-explicit type finite-element formulation based on elastic/crystalline-viscoplastic theory to predict the dynamic forming limits of sheet metal. Formulates an evolution equation governing all the slip stages of a single crystal, by modifying Pierce and Bassani's crystalline plasticity models. Interprets precisely the experimentally observed hardening evolution. Takes account of the importance of the strain rate and temperature sensitivity of the material in predicting dynamic plastic instability. Analyses the deformation and strain localization in a rectangular sheet under stretching, in relation to the plane strain assumption, using the numerical results to demonstrate the influences of tension force and temperature on strain localization, and to show the temperature dependence of shear band formation. Demonstrates that the deviation of tension direction from the axis of symmetry of a single crystal causes non-simultaneous sliding between primary and conjugate slip systems, resulting in S-shaped non-symmetrical deformation.
机译：描述了基于弹性/结晶粘塑性理论的动态显式有限元配方的开发，以预测钣金的动态成形极限。通过修改Pierce和Bassani的晶体可塑性模型，制定了控制单晶所有滑移阶段的演化方程。精确解释实验观察到的硬化演变。考虑到材料的应变速率和温度敏感性在预测动态塑料不稳定性中的重要性。相对于平面应变假设，分析了矩形板在拉伸下的变形和应变局部化，并利用数值结果证明了张力和温度对应变局部化的影响，并显示了剪切带形成的温度依赖性。证明拉伸方向偏离单晶对称轴会导致初级和共轭滑移系统之间发生非同时滑动，从而导致S形非对称变形。

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