Cross-ply unidirectional laminates made of ultra-high molecular weight polyethylene fibers are widely used as components of bullet-proof vests. To simulate the delamination process of the material under penetration, we constructed a numerical mechanical model, which was validated by tests using 7.62 × 39 mm rifle bullets penetrating laminates of different thicknesses. The results show that the delamination region is essentially diamond-shaped. The simulated delamination region is in good agreement with the experimental data. It is found that the delamination region increases with the compression modulus along the fiber direction. The delamination region increases when the shear strength between the fabric layers decreases; However, it is little influenced by the normal strength. The delamination region of the front face of the laminate is little influenced by the failure strain of the material and the initial velocity of the bullet. The delamination region of the back face increases with the failure strain and decreases with the initial velocity.

由超高分子量聚乙烯纤维制成的交叉单向层压材料被广泛用作防弹背心的组成部分。为了模拟穿透材料的分层过程，我们构建了一个数值力学模型，该模型通过使用7.62×39毫米步枪子弹穿透不同厚度的层压板的测试进行了验证。结果表明，分层区域基本上是菱形的。模拟的分层区域与实验数据非常吻合。发现分层区域随着压缩模量沿着纤维方向增加。当织物层之间的剪切强度降低时，分层区域增加；但是，受普通强度的影响很小。层压板正面的分层区域几乎不受材料的破坏应变和子弹的初始速度的影响。背面的分层区域随着破坏应变而增加，并且随着初始速度而减小。