某复合材料气瓶在疲劳试验中远低于平均疲劳寿命时即发生漏水,通过对复合材料气瓶整体损伤研究、异常区泄漏判定研究及微观分析,定位了漏水部位并对低疲劳寿命原因进行了分析。结果表明:内衬在制造过程中产生的微小凹坑缺陷是导致复合材料气瓶低疲劳寿命的原因,在疲劳试验中,凹坑缺陷作为疲劳裂纹源,产生应力集中,引发裂纹扩展,最终形成穿透性裂纹,导致复合材料气瓶提前泄漏。 A composite material gas cylinder leaks much less than the average fatigue life in the fatigue test. Through the study on the overall damage of the composite gas cylinder, the judgment of the abnormal zone leakage and the microscopic analysis, the leakage part is located and the reason of low fatigue life is carried out analysis. The results show that the tiny pits in the manufacturing process are the causes of the low fatigue life of composite cylinders. In the fatigue test, the pits are the source of fatigue cracks, resulting in the stress concentration and the crack growth leading to the final formation Penetrating cracks lead to early leakage of the composite gas cylinder.