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Low Cycle Fatigue Life Evaluation of Notched Specimens Considering Strain Gradient

机译:考虑应变梯度的缺口试样低周疲劳寿命评估

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摘要

An improved model based on the Chaboche constitutive model is proposed for cyclic plastic behavior of metal and low cycle fatigue of notched specimens under cyclic loading, considering the effect of strain gradient on nonlinear kinematic hardening and hysteresis behavior. The new model is imported into the user material subroutine (UMAT) of the finite element computing software ABAQUS, and the strain gradient parameters required for model calculation are obtained by calling the user element subroutine (UEL). The effectiveness of the new model is tested by the torsion test of thin copper wire. Furthermore, the calibration method of strain gradient influence parameters of constitutive model is discussed by taking the notch specimen of Q235 steel as an example. The hysteresis behavior, strain distribution and fatigue failure of notched specimens under cyclic loading were simulated and analyzed with the new model. The results prove the rationality of the new model.
机译:考虑到应变梯度对非线性运动硬化和磁滞行为的影响,提出了一种基于Chaboche本构模型的改进模型,用于金属的循环塑性行为和缺口载荷在循环载荷下的低周疲劳。将新模型导入到有限元计算软件ABAQUS的用户材料子例程(UMAT)中,并通过调用用户元素子例程(UEL)获得模型计算所需的应变梯度参数。新模型的有效性通过细铜线的扭转测试进行了测试。此外,以Q235钢的缺口试样为例,讨论了本构模型应变梯度影响参数的标定方法。用新模型模拟并分析了循环荷载作用下缺口试样的磁滞行为,应变分布和疲劳破坏。结果证明了该模型的合理性。

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