Abstract For metals under fatigue, microplastic strain localisation leads to the formation of discrete slip bands, which contributes to the initiation and propagation of short cracks. In this paper, a discrete slip band model is introduced to investigate the slip-controlled cyclic deformation and short crack growth in a single crystal alloy. In conjunction with crystal plasticity and normal factor-based critical resolved shear stress, finite element simulations demonstrated the success of the discrete model in describing orientation-dependent cyclic stress-strain responses. The proposed approach is also capable of predicting slip-controlled short crack growth, based on element deletion technique and individual cumulative shear strain criterion.

中文翻译：

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低周疲劳下滑移控制循环变形和短裂纹扩展的离散晶体塑性建模

摘要 对于疲劳状态下的金属，微塑性应变局部化导致离散滑移带的形成，这有助于短裂纹的萌生和扩展。在本文中，引入离散滑移带模型来研究单晶合金中滑移控制的循环变形和短裂纹扩展。结合晶体塑性和基于法向因子的临界解析剪应力，有限元模拟证明了离散模型在描述依赖于方向的循环应力应变响应方面的成功。所提出的方法还能够基于元素删除技术和单个累积剪切应变准则来预测滑移控制的短裂纹扩展。