Abstract An improved distortional plasticity framework that describes the anisotropic hardening occurring during strain path changes, such as the Bauschinger and cross-loading effects, is developed. This approach is a modified version of the homogeneous anisotropic hardening (HAH) framework proposed almost a decade ago. In the present formulation, the yield condition includes an alternative description of the distortion suggested by crystal plasticity simulation results. In addition, it incorporates the influence of the hydrostatic pressure, which manifests itself by a higher flow stress in uniaxial compression than in tension. The state variable evolutions are modified compared with the previous HAH version to improve the material response when the strain path changes occur near a pure cross-loading condition. The model is calibrated on a DP780 dual-phase steel sheet sample using the data of a tension-compression test with three full cycles, as well as a sequence of two uniaxial tension segments in different directions. After calibration, predicted and experimental stress-strain curves obtained for independent loading sequences are compared and shown to be good agreement. Finally, theoretical predictions of two-step tension tests using the constitutive coefficients of DP780 are discussed to highlight the improvement offered by this enhanced framework.

中文翻译：

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变形塑性骨架在高级高强钢中的应用

摘要 开发了一种改进的变形塑性框架，该框架描述了在应变路径变化期间发生的各向异性硬化，例如包辛格和交叉加载效应。这种方法是近十年前提出的均匀各向异性硬化 (HAH) 框架的修改版本。在本公式中，屈服条件包括对晶体塑性模拟结果建议的变形的替代描述。此外，它还结合了静水压力的影响，这表现为单轴压缩中的流动应力高于拉伸中的流动应力。与之前的 HAH 版本相比，状态变量的演变进行了修改，以改善当应变路径变化发生在纯交叉加载条件附近时的材料响应。该模型是在 DP780 双相钢板样品上使用三个完整循环的拉伸-压缩测试数据以及不同方向的两个单轴拉伸段的序列校准的。校准后，对独立加载序列获得的预测和实验应力-应变曲线进行了比较，并显示出良好的一致性。最后，讨论了使用 DP780 的本构系数的两步拉伸试验的理论预测，以突出该增强框架提供的改进。对独立加载序列获得的预测和实验应力-应变曲线进行了比较，并显示出良好的一致性。最后，讨论了使用 DP780 的本构系数的两步拉伸试验的理论预测，以突出该增强框架提供的改进。对独立加载序列获得的预测和实验应力-应变曲线进行了比较，并显示出良好的一致性。最后，讨论了使用 DP780 的本构系数的两步拉伸试验的理论预测，以突出该增强框架提供的改进。