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考虑应变梯度的缺口试样低周疲劳寿命评估

Low Cycle Fatigue Life Evaluation of Notched Specimens Considering Strain Gradient.

作者信息

Qin Shenghuan, Xiong Zaiyin, Ma Yingsong, Zhang Keshi

机构信息

College of Civil Engineering and Architecture; Key Lab of Disaster Prevent and Structural Safety; Guangxi Key Lab Disaster Prevent and Engineering Safety; Guangxi University, Nanning 530200, China.

School of Mechanical and Traffic Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China.

出版信息

Materials (Basel). 2020 Feb 23;13(4):1001. doi: 10.3390/ma13041001.

DOI:10.3390/ma13041001
PMID:32102226
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7079615/
Abstract

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.

摘要

考虑应变梯度对非线性运动硬化和滞后行为的影响，提出了一种基于Chaboche本构模型的改进模型，用于描述循环加载下金属的循环塑性行为和缺口试样的低周疲劳。将新模型导入有限元计算软件ABAQUS的用户材料子程序（UMAT）中，并通过调用用户单元子程序（UEL）获得模型计算所需的应变梯度参数。通过细铜丝扭转试验验证了新模型的有效性。此外，以Q235钢缺口试样为例，探讨了本构模型应变梯度影响参数的标定方法。采用新模型对缺口试样在循环加载下的滞后行为、应变分布和疲劳失效进行了模拟分析。结果证明了新模型的合理性。

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