The effect of overload on the fatigue crack growth and delamination of the Ti/Cf/PMR (Polymerization of Monomeric Reactants) polyimide hybrid laminates and the interplay behavior between crack growth and delamination were studied by applying single-peak, multi-peak, and block overloads. The retardation effect was discovered under variable overloads. The mechanism of crack growth and delamination was also analyzed. It was found that the crack grew perpendicular to the fiber direction and the initiation site of delamination always located around the micro-cracks of metal layers. The delamination growth was affected by the maximum stress level and the stress sequence. The interplay between crack growth and delamination on fatigue failure of Ti/Cf/PMR polyimide hybrid laminates could accelerate the crack growth and delamination extension.

通过应用单峰，多峰和嵌段研究了过载对Ti / Cf / PMR（单体反应物聚合）聚酰亚胺杂化层压板疲劳裂纹扩展和分层的影响以及裂纹扩展和分层之间的相互作用。超载。在可变过载下发现了减速作用。还分析了裂纹扩展和分层的机理。发现裂纹垂直于纤维方向生长，并且脱层的起始位置始终位于金属层的微裂纹周围。分层增长受最大应力水平和应力序列的影响。Ti / Cf / PMR聚酰亚胺杂化层压板的疲劳失效时裂纹扩展与分层之间的相互作用可以加速裂纹扩展和分层扩展。