高速破片侵彻下高分子聚乙烯层合板的弹道极限估算方法

为了得到弹道冲击下高分子聚乙烯（UHMWPE）层合板的弹道极限估算方法，提出四阶段吸能模型，分析3.3 g立方体破片高速侵彻不同厚度UHMWPE层合板的吸能过程，并在此基础上提出UHMWPE层合板在高速侵彻作用下弹道极限的估算方法，分析不同板厚UHMWPE层合板在弹道极限下不同吸能方式吸收能量的比例。结果表明：在弹道极限情况下，复合材料层合板的主要吸能方式为剪切破坏吸能、压缩破坏吸能、层合板的结构运动吸能和纤维拉伸变形吸能，且剪切破坏吸能、压缩破坏吸能和结构运动吸能在总吸能中的比例是随板厚的增加而增大，纤维拉伸变形吸能的比例则是随板厚的增加而减小；在高速侵彻作用下，UHMWPE弹道极限的估算方法与试验结果吻合良好。

Estimating Method for the Ballistic Limit of Ultra-High Molecular Weight Polyethylene Fiber-Reinforced Laminates Under High-Velocity Fragment Penetration

In order to get the estimating method of the ballistic limit of ultra-high molecular weight poly-ethylene（UHMWPE） fiber-reinforced laminates under ballistic impact,this paper proposes a 4-stage model of energy-absorbing and analyzes the actual energy-absorbing process of UHMWPE laminates with different thickness being penetrated by a 3.3 g cube fragment. The method of estimating the ballistic limit of UHMWPE laminates under high-velocity penetration is presented accordingly,which analyzes the ener-gy distribution of UHMWPE laminates with different thickness under the extreme condition. The results show that the main energy-absorbing method of composite laminates is the absorption of shearing failure and compressing failure,as well as constructural kinetic energy and fiber tensile energy. When the thick-ness of laminates increases,the proportion of the first three energy sources also increases,while the fiber tensile energy absorption reduces. Overall,the ballistic limit estimated with the proposed method agrees well with the experimental data.