通过对T 300／5405复合材料层板进行低速冲击后的压‐压疲劳实验，研究含不同冲击损伤层板的压缩性能与其在多级应力水平下的疲劳寿命与损伤扩展，并讨论冲击能量、应力水平、损伤扩展对层板疲劳寿命的影响。结果表明：冲击损伤明显降低层板的剩余强度；在低应水平下，冲击能量越大，含冲击损伤层板的疲劳寿命越小；疲劳实验中损伤经历平稳扩展和快速扩展两个阶段，其中平稳扩展阶段约占总体寿命的80％，快速扩展阶段约占总体寿命的20％，损伤扩展速率随着应力水平降低而减小。
Compression‐compression fatigue tests were carried out on T 300/5405 composite laminates after low‐velocity impact ,compression performance of the laminates with different impact damages was studied together with its fatigue life and damage propagation under different stress levels ,then the effects of impact energy ,stress level and damage propagation on fatigue life of laminates were dis‐cussed .The results indicate that impact damage can greatly reduce the residual strength of laminates ;under low fatigue load levels ,the higher impact energy is ,the shorter the fatigue life of laminates with impact damage will be ;damage propagation undergoes two stages during the fatigue test ,namely the steady propagation and the rapid propagation ,accounting for 80% and 20% of the overall fatigue life ,respectively ;damage propagation rate decreases with the reduction of stress level .
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