Abstract The work presents experimental and numerical results on dynamic fracture of PMMA plates subjected to impact loading. The experimental tests were conducted using steel cylinder-shaped projectile accelerated using a gas gun. In order to evaluate performance of the tested specimens, residual impactor velocity was assessed using high-speed photography setup. Square-shaped PMMA specimens with three thicknesses were investigated using various projectile velocities. For all the three specimen types the ballistic limits were experimentally obtained. The conducted experiments were numerically simulated using finite element method with explicit time integration scheme and incubation time fracture model for the material failure prediction. Experiments with all three specimen configurations were successfully simulated using one parameter – incubation time, which was evaluated from existing experimental data on the dynamic fracture of PMMA. In addition to the simulations of the real experiments estimates on performance of a sample with a virtual geometry were made using the developed numerical approach.

中文翻译：

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PMMA冲击断裂的实验和数值分析

摘要 本文介绍了 PMMA 板在冲击载荷作用下动态断裂的实验和数值结果。实验测试是使用使用气枪加速的钢筒形弹丸进行的。为了评估测试样品的性能，使用高速摄影设置评估了残余撞击器速度。使用各种弹丸速度研究了具有三种厚度的方形 PMMA 试样。对于所有三种试样类型，弹道极限都是通过实验获得的。使用有限元方法对进行的实验进行了数值模拟，该方法具有显式时间积分方案和用于材料失效预测的潜伏时间断裂模型。使用一个参数（孵化时间）成功模拟了所有三种试样配置的实验，该参数是根据现有的 PMMA 动态断裂实验数据进行评估的。除了真实实验的模拟之外，还使用开发的数值方法对具有虚拟几何形状的样本的性能进行了估计。