16MnR钢焊接头的延拓概率疲劳S-N曲线

针对16MnR钢焊接头,利用现有不同试验条件下的中短寿命试验数据,采用2m-1指数法,延拓概率疲劳S-N曲线到长寿命范围.基于Basquin关系,得到包含存活概率曲线、置信度曲线和两者融合曲线在内的延拓概率疲劳曲线,在中短寿命范围对试验数据有良好的拟合效果,在延拓阶段可对长寿命范围作近似预测.该方法可近似合理地对曲线进行延拓,较直接利用中短寿命S-N曲线延长到长寿命范围的直接法更为合理,结果表明,该方法是可行的.

Extrapolation of probabilistic fatigue S-N curves on 16MnR steel weld joint

This paper extended the commonly probabilistic curves of 16MnR steel weld joint into long life regime by 2m-1 exponent method according to the fatigue test data in different test conditions. The curves are constructed by Basquin relations, consisting of survival probability-based curves, confidence-based curves, and survival probability and confidence-based curves. These curves fit the test data well in original regime, can predict the long life regime approximately.The extrapolated effects, which fit into the test data of 16MnR steel weld joint, reveal that the method acts approximately as the function of extrapolation, and it is more reasonable than direct method, which extends original S-N curves into long life regime directly. The results show that the method is feasible. 6 tabs, 4 figs, 8 refs.