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Research on Fatigue Crack Propagation of 304 Austenitic Stainless Steel Based on XFEM and CZM
Metals ( IF 2.9 ) Pub Date : 2020-06-01 , DOI: 10.3390/met10060727
Xiaodong Hu , Jie Xu , Xiangmei Du , Yong Zhang , Fan Zhou

The fatigue crack propagation of 304 austenitic stainless steel was studied both by experiments and numerical simulations. Two methods were applied to simulate the crack propagation: the extended finite element method (XFEM) and the cohesive zone model (CZM). Based on the XFEM, the direct cyclic solver was used to simulate the fatigue crack propagation. Based on the CZM, the VUMAT subroutine was used to describe the crack tip constitutive equation during fatigue crack propagation, and the mechanical properties of the crack tip were simulated. The effects of different frequency, f, and stress ratio, R, on the fatigue crack growth life were studied by XFEM and CZM separately and compared with the experimental results. Results show that the crack propagation path simulated by the XFEM agrees well with the experimental result, but the deviation of the fatigue life between the simulated results and the experimental results is large. The CZM model can predict the crack propagation life very well in comparison with the experimental data, but it has certain limitations because the crack propagation path is preset.

中文翻译:

基于XFEM和CZM的304奥氏体不锈钢疲劳裂纹扩展研究。

通过实验和数值模拟研究了304奥氏体不锈钢的疲劳裂纹扩展。应用了两种方法来模拟裂纹扩展:扩展有限元方法(XFEM)和内聚区模型(CZM)。基于XFEM,直接循环求解器用于模拟疲劳裂纹扩展。基于CZM,使用VUMAT子程序描述疲劳裂纹扩展过程中的裂纹尖端本构方程,并模拟了裂纹尖端的力学性能。不同频率f和应力比R的影响XFEM和CZM分别研究了疲劳裂纹扩展寿命,并与实验结果进行了比较。结果表明,XFEM模拟的裂纹扩展路径与实验结果吻合较好,但疲劳寿命与模拟结果的偏差较大。与实验数据相比,CZM模型可以很好地预测裂纹扩展寿命,但是由于预设了裂纹扩展路径,因此它具有一定的局限性。
更新日期:2020-06-01
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