Thermodynamic dislocation theory incorporating dislocation impediment by the grain boundaries is developed to analyze the shear test of polycrystals. With a small set of physics-based material parameters, we are able to simulate the stress–strain curves for the load and its reversal, which are consistent with the experimental curves of Thuillier and Manach (Int J Plast 25:733–751, 2009). Representative distributions of plastic slip under load and its reversal are presented, and their evolution explains the extended length of the transition stage during load reversal.

中文翻译：

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多晶中晶界的位错障碍

开发了结合晶界位错障碍的热力学位错理论来分析多晶的剪切试验。使用一小组基于物理的材料参数，我们能够模拟载荷及其反转的应力-应变曲线，这与 Thuillier 和 Manach 的实验曲线一致 (Int J Plast 25:733–751, 2009 ）。介绍了载荷下塑性滑移的代表性分布及其反转，它们的演变解释了载荷反转期间过渡阶段的延长长度。