Abstract This paper deals with the comparative investigation of fracture envelopes constructed by the 3D-DIC and hybrid inverse analyses. For the evaluation of fracture limits of the DP980 1.2t steel over a wide range of loading conditions, tensile tests were conducted using three different specimens that are expected to induce certain stress states of plane strain tension, in-plane shear, and uniaxial tension at the potential location for the fracture initiation. The modified Mohr–Coulomb ductile fracture criterion was selected in this study to investigate the influence of the fracture envelope identification based on each way of loading history evaluation not only on the level of fracture limits but also on the fracture prediction especially for the simulation of square cup deep drawing. For an in-depth understanding of non-linear loading history on the variation of ductility limit, apparent fracture with respect to strain was numerically computed according to the change of loading path. Finally, a comparison of results from the square cup deep drawing test and the FEA prediction was performed in terms of punch force and stroke to confirm the model performance at various ways of the loading history evaluation.

中文翻译：

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考虑加载历史的 3D-DIC 上的断裂包络和混合逆方法

摘要 本文研究了由 3D-DIC 和混合逆分析构建的裂缝包络的比较研究。为了评估 DP980 1.2t 钢在各种载荷条件下的断裂极限，使用三种不同的试样进行了拉伸试验，这些试样预计会在断裂起始的潜在位置。本研究选择了修正的 Mohr-Coulomb 韧性断裂准则，研究基于每种加载历史评价方式的断裂包络识别不仅对断裂极限水平而且对断裂预测的影响，特别是对于方形的模拟。杯深拉。为了深入了解延性极限变化的非线性加载历史，根据加载路径的变化对应变的表观断裂进行了数值计算。最后，在冲头力和冲程方面对方形杯深拉试验和 FEA 预测的结果进行了比较，以确认模型在各种加载历史评估方式下的性能。