Fatigue property and its probabilistic character of S06 steel
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摘要: 采用高频疲劳试验方法对新型高强度沉淀硬化马氏体不锈钢S06钢中长寿命疲劳性能进行了测量,结果发现:随着应力水平降低,疲劳裂纹趋向于从试样内部萌生,裂纹内部萌生的试样寿命高于表面萌生的试样寿命,二者分散性很大.为了对S06钢长寿命疲劳数据概率特性进行正确的评估,主要对内部萌生机制下的数据进行了研究:利用定时截尾数据的极大似然估计方法和定时截尾数据的柯尔莫哥洛夫检验方法对长寿命区一定应力水平下的疲劳寿命概率分布情况进行了研究,结果表明疲劳寿命服从对数正态分布;采用考虑越出数据的极大似然方法对S06钢应力寿命数据进行拟合,建立了P-S-N曲线模型;利用P-S-N曲线对S06钢长寿命区疲劳强度概率分布进行了讨论.Abstract: The fatigue property between 104~107 cycles of S06 steel, which is a new kind of precipitation-hardened stainless steel with high yield strength, was tested with PLG-100C high-cycle fatigue testing machine. With the decrease of stress amplitude, more fatigue crack initiated from subsurface. The fatigue life of specimens where fatigue crack initiates from subsurface is longer than that of specimens where fatigue crack initiates from surface at the same stress amplitude. To estimate the probabilistic character of fatigue property in high cycle range, the fatigue data of interior initiation was researched: maximum likelihood method and Kolmogorov test method considering life truncate data was used to research the distribution of fatigue life and result shows that fatigue life follows lognormal distribution in long life region; maximum likelihood method considering life truncate data was used to fit P-S-N curve; the P-S-N curve was used to discuss the distribution of fatigue strength in long life region.
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Key words:
- S06 steel /
- fatigue strength /
- truncate life test /
- maximum likelihood estimation /
- P-S-N curve
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