疲劳破坏是结构失效的主要原因之一。基于复合材料各向异性层合板的宏观力学理论,分析在横向交变载荷作用下层合板的应力场。结合材料的S-N曲线和累积损伤原理,建立局部名义应力与结构整体寿命相关联的疲劳寿命预测模型,计算层合板的疲劳损伤和寿命。采用名义应力的方法估算复合材料层合板的疲劳寿命较为便捷和直观。
Fatigue failure is one of the main reasons for structural failure.Based on macroscopic mechanical theory of aeolotropic laminate,analysis of the stress field of laminate under lateral alternating load was carried out.With material's s-n curves and cumulative damage theory,a fatigue life predict model was established,in which local nominal stress and fatigue life are associated for calculating laminate's fatigue damage and life.It is convenient and intuitionistic to use the nominal stress method for estimating laminate's fatigue life.