随机变幅载荷下结构疲劳可靠性分析——RDCDR模型

通过对恒幅载荷下疲劳应力幅与寿命之间的S-N关系的随机化处理,在Miner线性累积损伤理论下,建立了一种用于随机变幅载荷下结构疲劳可靠性分析模型(RDCDR模型)。模型中的各参数由恒幅疲劳试验数据采用最大似然法确定。采用Monte—Carlo法对模型求数值解。举实例说明了模型的应用。

A MODEL FOR THE RELIABILITY ANALYSIS OF STRUCTURES UNDER RANDOM STRESS RANGE LOADINGS (RDCDR MODEL)

Fatigue failure is caused by the cumulative damage, so the method for fatigue reliability analysis of structures under random stress range loadings must be different from that for statics reliability analysis, In this paper stochastic functions are used to describe the S-Afrelation ship, and Miner's linear damage accumulation theory is employed to set up a model for the relia bility analysis of structure under random stress range loadings. The model is called Random Deterministic cumulative damage Reliability Model (RDCDR model) in this paper. The parameters in the model can be eva luated from the data of fatigue test under constant range stress loadings with Maximum-Like lihood Method. Monte-Carlo Method is used to give a numerical solution for the model .Examples of application are demonstrated.