考虑两类不同随机应力时的构件疲劳可靠度计算模型  

Fatigue Reliability Analysis Model for Structural Members under Random Stress-Time Courses

作　　者：苏彦江[1] 高庆[1] 王光钦[1] 

机构地区：[1]西南交通大学应用力学与工程系,四川成都610031

出　　处：《西南交通大学学报》2001年第6期584-587,共4页Journal of Southwest Jiaotong University

摘　　要：提出了一种随机应力时间历程作用下构件疲劳可靠性分析的新模型。该模型首先根据材料的p S N曲线 ,并考虑构件疲劳强度影响因素的随机性 ,在给定不同等幅名义应力水平下进行构件的疲劳可靠性分析 ,计算给定等幅名义应力下构件的疲劳可靠寿命 ,从而得到构件的 p S N曲线。然后利用概率Miner准则和构件的p S N曲线求得在随机应力时间历程作用下构件的疲劳可靠寿命和给定寿命下构件的疲劳可靠度。A model for fatigue reliability analysis of structural members under random stress time courses is proposed. Two kinds of random stresses are taken into consideration. The fatigue reliability of the members under constant amplitude stresses are analyzed based on the p S N curve of material and the random factors affecting fatigue strength to obtain the p S N curve of the members. Then the fatigue reliability of the members under random stress time courses is calculated by using Miners rule and the p S N curve of the members.

关 键 词：构件 疲劳寿命 随机应力 P-S-N曲线 疲劳可靠度 概率Miner准则 疲劳强度 计算模型 

分 类 号：TH123.3[机械工程—机械设计及理论]