HCF propagation with unilateral initial crack in 304 stainless steel piece by XFEM
FU Yuan1,2,LIAO Yan-song1,LU De-ping1,LIU Jin1,CHEN Zhi-bao1,WEI Shi-yong1,2
(1. Applied Physics Institute, Jiangxi Academy of Sciences, Nanchang 330028, Jiangxi, China 2. College of Material Science and Engineering, Nanchang University, Nanchang 330031, Jiangxi, China)
Abstract:In order to investigate the fatigue life of micro crack metal with low stress level cyclic loadings,an unilateral fatigue crack propagation of 304 stainless steel piece was researched with Paris criterion and extended finite element method (XFEM) based crack tip singularity. And the crack propagation with high cycle stress was analyzed by experiment and numerical method separately. Result shows that the whole cycle life of this sample is about 1.18 million times. The simulated values of propagation velocity are in good agreement with that of experimented values. The nonlinear fitting degree in whole areas between numerical solution by XFEM and analytical solution by stress intensity function (SIF) is very well. But the fitting degree of[?K]value in III area is reduced for the reason of stress intensity factor in crack tip operational instability enlarged with the crack expanding.
付远,程香平,万珍珍,等.XFEM计算3D打印PLA材料拉伸试样的裂纹扩展[J].塑性工程学报,2016,23(2):54-60.Fu Yuan Cheng Xiang ping, Wan Zhen Zhen et al. Crack propagation of PLA 3D printing strecting specimen and calculated by XFEM[J]. Journal of plasticity Engineering,2016,23(2):54-60.
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