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Modeling of fatigue crack growth under high-low sequence loading

机译：高低序列载荷下疲劳裂纹增长的建模

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The fatigue crack growth behavior of one compact tension specimen of 16MnR steel under high-low sequence loading was investigated. The symmetric half finite element model under plane-stress state was used to calculate the elastic-plastic stress-strain responses, in which the Armstrong-Frederick type cyclic plasticity model was implemented as a user material subroutine UMAT of ABAQUS. A recently developed dynamic crack growth model was used to simulate the effects of high loading step on the successive low loading step. The detailed evolution process of the crack closure and cyclic plastic zone within the retardation region of fatigue crack growth was obtained. The extend of the crack closure, the size of cyclic plastic zone and the stress gradient have significant influence on the fatigue crack growth rate. The predicted fatigue crack growth rate is in good agreement with the experimental data.
机译：研究了16MnR钢在高低序列负载下的一个紧凑张力样品的疲劳裂纹生长行为。平面应力状态下的对称半有限元模型用于计算弹性塑性应力 - 应变响应，其中Armstrong-Frederick型循环塑性模型被实施为ABAQUS的用户材料子程umat。最近开发的动态裂纹增长模型用于模拟高负载步骤对连续低负载步骤的影响。得到了疲劳裂纹生长延迟区域内的裂纹闭合和循环塑料区的详细进化过程。裂纹闭合的延伸，循环塑料区的尺寸和应力梯度对疲劳裂纹生长速率有显着影响。预测的疲劳裂纹增长率与实验数据吻合良好。

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