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首页> 外文期刊>Fatigue & Fracture of Engineering Materials & Structures >Effects of the stress state on plastic deformation and ductile failure: Experiment and numerical simulation using a newly designed tension-shear specimen
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Effects of the stress state on plastic deformation and ductile failure: Experiment and numerical simulation using a newly designed tension-shear specimen

机译：应力状态对塑性变形和延性破坏的影响：使用新设计的拉剪试样的实验和数值模拟

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摘要

The stress state is one of the most notable factors that dominates the initiation of ductile fracture. To examine the effects of the stress state on plasticity and ductile failure, a new tension-shear specimen that can cover a wide range of stress triaxialities was designed. A fracture locus was constructed in the space of ductility and stress triaxiality for two typical steels based on a series of tests. It is observed that the equivalent plastic strain at failure exhibits a nonmonotonic variation with increasing the value of stress triaxiality. A simple damage model based on the ductility exhaustion concept was used to simulate the failure behaviour, and a good agreement is achieved between simulation results and experimental data. It is further shown that consideration of fracture locus covering a wide range of stress triaxialities is a key to an accurate prediction.
机译：应力状态是主导韧性断裂开始的最显着因素之一。为了检查应力状态对可塑性和延性破坏的影响，设计了一种新的拉伸剪切试样，该试样可以覆盖大范围的应力三轴性。根据一系列测试，在两种典型钢的延性和应力三轴性空间中构造了一个断裂轨迹。观察到，当破坏时的等效塑性应变随着应力三轴性值的增加而呈现出非单调变化。使用了基于延性耗尽概念的简单损伤模型来模拟失效行为，并且在模拟结果和实验数据之间取得了良好的一致性。进一步表明，考虑覆盖应力三轴性大范围的断裂轨迹是准确预测的关键。

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