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针对缠绕复合材料壳体的低速冲击问题,采用试验和仿真相结合的方法研究了不同冲击能量下复合材料的冲击响应规律和损伤模式。基于连续介质损伤力学方法建立了考虑材料强度威布尔分布的复合材料面内损伤模型,并将模型通过用户材料子程序VUMAT嵌入ABAQUS中模拟复合材料面内损伤;同时采用cohesive单元模拟复合材料层间分层损伤。研究结果表明:在1.5k N冲击力附近缠绕复合材料产生初始损伤,初始损伤出现后,冲击力上升速率降低,并在最大冲击力附近处出现明显震荡;当冲击力达到3.5k N左右时出现纤维破坏,冲击力不再随冲击能量增加而增加。仿真结果与试验结果较为一致,表明该模型适用于研究缠绕复合材料壳体的低速冲击问题。
Aiming at the low-speed impact problem of the wound composite shell, the impact response law and the damage mode of the composite under different impact energy were studied by the combination of test and simulation. Based on the continuum damage mechanics method, the in-plane damage model of composites considering the Weibull distribution of material strength is established. The model is embedded in ABAQUS through user material subroutine VUMAT to simulate the in-plane damage of composites. Simultaneously, Stratified injury. The results show that the initial damage occurs when the composite material is wound around the impact force of 1.5k N, and the rate of increase of the impact force decreases after the initial damage occurs, and shows obvious oscillation around the maximum impact force. When the impact force reaches about 3.5k N Fiber damage, impact no longer increases with the impact energy. The simulation results are in good agreement with the experimental results, which shows that the model is suitable for studying the low-speed impact of the wound composite shell.