Abstract The results of experimental and numerical analyses concerning the failure mechanisms of S355JR steel are presented. Tests were performed on S355JR steel after three heat treatments at three different temperatures with five specimen geometries that were designed to provide different values of the stress triaxiality and Lode parameter as well as different critical strains and stresses at the onset of final failure. Depending on the test temperature and specimen geometry, cleavage or ductile fracture were observed; the latter occurred either by the void nucleation–growth–coalescence process or by the shear mechanism. The locations where the observed mechanism started were localized, and mechanical fields were computed in these domains. The critical effective plastic strains were determined as functions of the stress triaxiality and Lode parameter in the case of ductile fracture, and the critical opening stresses were determined as functions of the Lode parameter and effective plastic strains in the case of cleavage fracture.

中文翻译：

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S355JR钢破坏机理的实验数值分析

摘要 介绍了有关 S355JR 钢失效机制的实验和数值分析结果。对 S355JR 钢在三种不同温度下进行了三种热处理后进行了测试，采用五种几何形状的试样，旨在提供不同的应力三轴度和 Lode 参数值，以及在最终破坏开始时的不同临界应变和应力。根据测试温度和试样几何形状，观察到解理或韧性断裂；后者通过空隙成核-生长-聚结过程或剪切机制发生。观察到的机制开始的位置被定位，并在这些域中计算机械场。