中文摘要：

基于概率的破裂力学途径，材料的一个新概念起始的疲劳质量(MIFQ ) 被开发。然后，在 S-N 曲线之间的关系和裂缝繁殖曲线被学习。从学习，一个新耐久性分析方法被介绍。在这个方法， S-N 曲线被用来在经常的振幅装载下面决定裂缝生长率并且在耐久性上评估不同因素的效果然后结构的耐久性被分析。测试和分析显示这个方法在严峻、更高的精确性，可靠性和概论上有更低的依赖并且对申请方便。

英文摘要：

Based on probabilistic fracture mechanics approach, a new concept of material initial fatigue quality （MIFQ） is developed. Then, the relation between S-N curve and crack propagation curve is studied. From the study, a new durability analysis method is presented. In this method, S-N curve is used to determine crack growth rate under constant amplitude loading and evaluate the effects of different factors on durability and then the structural durability is analyzed. The tests and analyses indicate that this method has lower dependence on testing, and higher accuracy, reliability and generality and is convenient for application.