The motivation of the present study entails the determination of fracture initiation of a single crystal copper edge-crack specimen subjected to tensile load by considering the influence of crystallographic anisotropy, strain hardening and damage accumulation. To accomplish the purpose of this study, a damage criterion coupled with crystal plasticity finite element method was used to determine material softening after the peak load. Damage evolution was chosen as the function of maximum shear strain within the crystal plasticity framework. Coupled with a damage criterion, the crystal plasticity model was used to reproduce the stress-strain responses of copper single crystals until failure. The model was then applied to assess damage evaluation near crack-tip of a single crystal copper edge-crack specimen along two crystallographic orientations of tensile loading directions. The analysis abetted to predict fracture initiation (J-initiation) of a crack lying along various crystallographic orientations, while keeping the loading direction orientation identical in all the cases. The methodology presented here has the scope to analyze single crystal complex structures with cracks subjected to loading along various crystallographic orientations.

本研究的动机是通过考虑晶体学各向异性，应变硬化和损伤积累的影响来确定承受拉伸载荷的单晶铜边缘裂纹试样的断裂开始。为了达到本研究的目的，采用损伤准则和晶体可塑性有限元方法来确定峰值载荷后材料的软化。选择损伤演化作为晶体可塑性框架内最大剪切应变的函数。结合损伤判据，使用晶体可塑性模型来再现铜单晶直至失效的应力-应变响应。然后将该模型用于评估沿拉伸载荷方向的两个晶体学方向的单晶铜边缘裂纹样品的裂纹尖端附近的损伤评估。分析有助于预测骨折的发生（Ĵ裂纹沿着各种结晶取向卧，同时保持装载方向定向在所有情况下相同的-initiation）。此处介绍的方法具有分析具有沿各种晶体学取向承受载荷的裂纹的单晶复合物结构的范围。