Abstract The cyclic behaviour and fatigue crack initiation in low cycle regime of dual phase (DP) steel grade 590 were characterized. Experimental strain-controlled tension–compression tests and corresponding simulations using representative volume elements were carried out. The Chaboche kinematic hardening parameters were determined for each individual phases. The damage model based on accumulated inelastic hysteresis energy was incorporated for describing crack onset mechanism in the microstructure. Damage parameters were calibrated with experimental strain-life curves for crack initiation state. Effects of pre-strain on crack occurrence of steel were studied. Observed crack initiation and its life were well predicted by the proposed modelling scheme.

中文翻译：

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基于微观力学的高强度钢疲劳裂纹萌生建模

摘要 表征了双相（DP）钢590低周循环行为和疲劳裂纹萌生。使用具有代表性的体积元素进行了实验应变控制的拉伸-压缩测试和相应的模拟。Chaboche 运动硬化参数是为每个单独的阶段确定的。结合基于累积非弹性滞后能的损伤模型来描述微观结构中的裂纹发生机制。损伤参数用裂纹萌生状态的实验应变-寿命曲线校准。研究了预应变对钢材裂纹发生的影响。所提出的建模方案很好地预测了观察到的裂纹萌生及其寿命。