确定性疲劳累积损伤理论进展

The Review of Ascertainable Fatigue Cumulative Damage Rule

著名的Miner-Palmgren线性累积损伤理论的提出已有 70余年 ,但由于疲劳问题的复杂性 ,迄今为止还没有一个模型的工程应用价值能与该理论媲美。疲劳累积损伤理论仍在发展与完善中。文章根据疲劳损伤与疲劳累积损伤理论的特点 ,将确定性疲劳累积损伤理论分成两大类 ,即线性累积损伤理论和非线性累积损伤理论 ,并将主要的非线性累积损伤理论分成五类 :a .基于损伤曲线法的非线性累积损伤理论 ;b .基于材料物理性能退化概念的非线性累积损伤理论 ;c .基于连续损伤力学概念的非线性累积损伤理论 ;d .考虑载荷间相互作用效应的非线性累积损伤理论 ;e .基于能量法的非线性累积损伤理论。文章分析了每一类模型中有代表性模型的物理背景 ,回答了模型在疲劳累积损伤理论中存在的主要问题 ,简要评述了模型的优缺点 。

Famous Miner-Palmgren linear damage rule has been presented for 70 years. Because of the complicacy of fatigue research, no model could be compared with the Miner rule in engineering application to this day. Fatigue cumulative damage rule has been perfecting and developing. Based on the characteristics of fatigue damage and cumulative damage rule, this paper divided the rules of ascertainable fatigue cumulative damage rule into two main categories. One is linear cumulative damage rule. The other is non linear cumulative damage rule(NLCDR). The latter can be classified into five categories: NLCDR based on damage curve method; NLCDR based on the degradation of materials performances; NLCDR based on continuous damage mechanics; NLCDR considering the effects of load sequencing on the fatigue life; NLCDR based on energy rule. The representative model of every category is analyzed in physical background and briefly commented. The main questions of fatigue cumulative damage rule are answered. Finally, the several issues are discussed. [