缠绕复合材料壳体低速冲击损伤试验与仿真研究

Experimental and Numerical Analysis of Filament Winding Composite Shell under Low-Velocity Impact

关键词:  缠绕复合材料  低速冲击；损伤模型；冲击分析

Key words:  Filament winding composite  Low-velocity impact  Damage model  Impact analysis

摘要:

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1.5kN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3.5kN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。

Abstract:

In order to study the low velocity impact response and damage modes of filament winding composite shell，experimental and numerical methods were performed under different impact energies. An intralamina damage model considered Weibull distribution of the composite strengths was proposed based on continuum damage mechanics. The damage model was implemented in the ABAQUS/Explicit using the subroutine VUMAT and used to simulate the intralamina damage of composite. Meanwhile，the cohesive zone model was used to simulate the interlamina damage. The results indicated that the initial damage was occurred around 1.5kN of the impact force. After this，the impact force increased slowly until the maximum force appeared and sustained for some time. Fiber damage was arisen near 3.5kN of the impact force and the impact force did not increase with energy. The simulation results were comparable with experimental results. So it can be used to investigate the damage mechanics of filament winding composite shell under low-velocity impact.