纤维增强复合材料夹芯结构抗高速破片侵彻数值模拟

Simulation of the Fiber Reinforced Composite Sandwich Structure Subjected to High Velocity Fragment Impact

为防御高速破片侵彻,设计以玻纤为面板、PVC泡沫与高强聚乙烯为芯层的复合结构,利用数值方法研究其抗侵彻性能,分析破片侵彻过程以及探讨破片速度、PVC泡沫和高强聚乙烯在芯层中的位置及其对复合结构抗弹性能的影响。结果表明:破片侵彻过程中,前置玻纤发生剪切破坏;PVC泡沫若在高强聚乙烯前发生剪切破坏,在高强聚乙烯后发生压缩破坏;高强聚乙烯发生剪切和拉伸破坏,后置玻纤发生拉伸破坏。结构吸能随破片速度增加而增加;PVC泡沫要置于高强聚乙烯纤维后才能够充分发挥PVC泡沫压缩吸能特性。

In order to resist the high velocity fragment impact,the composite structure was designed with facet of the fiber glass,the core of PVC foam and high strength polyethylene. The anti-penetration performance of the structure and the impact process of fragment were analyzed numerically,as well as the impact velocity and the sequence of core material that influenced structure. The results showed that the front fiber glass emerges shearing failure while the back fiber glass emerges pulling deformation,PVC foam emerges shearing failure in the front of high strength polyethylene whereas compressed failure as the position changed. High strength polyethylene occurs shearing and pulling failures. The energy absorb of structure increases with the impact velocity of fragment increasing. The position of PVC foam should behind high strength polyethylene then the PVC foam cloud absorbed more energy by compress deformation.