破片侵彻含内衬碳纤维复合材料圆筒损伤机理

为研究含内衬碳纤维复合材料圆筒在破片侵彻下的损伤机理，基于LS-DYNA有限元仿真软件，采用Chang-Chang损伤准则和Cohesive界面单元，建立了考虑分层损伤的含内衬碳纤维复合材料圆筒在破片侵彻下的数值仿真模型。通过仿真计算破片对碳纤维复合材料圆筒的动态侵彻过程，得到了碳纤维层和金属内衬层的应力云图和损伤结果，研究了含内衬复合材料圆筒在破片侵彻作用下的损伤机理、吸能特性和破片初始速度对复合材料圆筒损伤模式的影响。研究结果表明：含内衬复合材料圆筒的损伤状态包括纤维断裂、层间分层、内衬凹陷、内衬破孔和复合材料层与内衬层分离。当破片速度为300 mm/s时，复合材料层的层间分层损伤程度处于较低状态，内衬层凹陷程度最大并形成破孔，复合材料层和内衬层的分离程度最大，内衬层的吸能比达到最大；当破片速度小于300 mm/s时，破片未完全穿透圆筒，复合材料层和内衬层的损伤程度较低，复合材料吸能比大于内衬层吸能比；当破片速度大于300 mm/s时，复合材料层的损伤模式为剪切冲塞，层间分层面积逐渐增大，内衬层凹陷程度逐渐降低，分离程度逐渐降低，内衬层吸能比降低并稳定在0.53左右。

Research on the Damage Mechanism during Fragment Penetration of Carbon Fiber Composites Cylinder with Lining

In order to study the damage mechanism of carbon fiber composites cylinder with lining during fragment penetration. Based on the LS-DYNA finite element simulation software, Chang-Chang damage guidelines and Cohesive interface unit were used to establish the numerical simulation model of carbon fiber composites cylinder with lining considering the delamination damage. The dynamic penetration process of fragments on carbon fiber composites cylinder was calculated by simulation, and the stress cloud and damage results of the carbon fiber layer and lining layer were obtained. The influence of damage mechanism and energy absorption characteristics on the damage mode of composites cylinder during fragment penetration was investigated. The results show that damage states include fiber breakage, interlaminar delamination, lining depression, lining holes, and separation of the composite layer from the lining layer. When the fragment speed is 300mm/s, the depression of the lining layer is the largest, and the hole is formed, the separation degree of the composite layer and the lining layer is the largest, and the energy absorption ratio of the lining layer reaches the maximum. When the fragment speed is less than 300mm/s, the cylinder is not penetrated, the damage degree of the composite layer and the lining layer is low, and the energy absorption ratio of the composite layer is greater than that of the lining layer. When the fragment speed is greater than 300mm/s, the damage mode of the composite layer is shear punching, the layered area increases, the depression and separation degree of the lining layer gradually decreases, and the energy absorption ratio of the lining layer decreases and stabilizes at about 0.53.