摘要
为了研究金属微裂纹材料在较低的循环应力水平下的使用寿命,通过裂纹尖端奇异点的XFEM方法和Paris疲劳裂纹扩展理论研究了304不锈钢薄片样本的单边裂纹疲劳扩展行为,分别通过试验和数值模拟分析了高周疲劳应力循环下的裂纹扩展情况。结果表明,试验样本的总疲劳循环寿命约为1 180 000次。模拟的裂纹扩展速率与实际的试验扩展速率吻合度较好,通过XFEM计算出的裂纹增长数值解与应力强度函数确定的解析解在全区有较好的非线性拟合度,但是由于随着裂纹长度的不断增加,裂纹尖端应力强度因子的运算不稳定性增大,导致在III区中,数值解与解析解的？K值出现了非线性拟合度降低的趋势。
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？Kvalue in III area is reduced for the reason of stress intensity factor in crack tip operational instability enlarged with the crack expanding.
作者
付远
廖岩松
陆德平
刘觐
陈志宝
魏仕勇
FU Yuan;LIAO Yan-song;LU De-ping;LIU Jin;CHEN Zhi-bao;WEI Shi-yong(Applied Physics Institute,Jiangxi Academy of Sciences,Nanchang 330028,Jiangxi,China;College of Material Science and Engineering,Nanchang University,Nanchang 330031,Jiangxi,China)
出处
《钢铁》
CAS
CSCD
北大核心
2018年第9期63-68,86,共7页
Iron and Steel
基金
江西省科学院青年基金重点资助项目(2017-YZD2-10)
江西省重点开发计划资助项目(20171BBE50043)
江西省科学院重大科技专项资助项目(2017-YZD2-15)
国家自然科学基金青年基金资助项目(51505203)
