We conduct plate impact experiments to investigate shock compression and spallation properties of polyethylene terephthalate. The Hugoniot equation of state, the apparent velocity–particle velocity relation, and the indices of refraction are obtained from Hugoniot experiments. Spall strength, as well as tensile strain rate is deduced at shock pressures up to $\sim$2.4 GPa in spallation shots. At low shock pressures ($<$0.6 GPa), the spall strength increases slightly with increasing shock pressure, as a result of increasing tensile strain rate. Release melting is observed at high impact velocities ($>$816 m ${\mathrm{s}}^{-1}$). Via X-ray computed tomography, three-dimensional void and crack structures are revealed for shock-recovered specimens. Small voids appear thin and curved for low-speed impacts but become ellipsoidal for high-speed impacts. Such different void shapes may be attributed to the diverse damage mechanisms at different impact velocities.

我们进行板冲击实验来研究聚对苯二甲酸乙二醇酯的冲击压缩和散裂特性。Hugoniot 状态方程、表观速度-粒子速度关系和折射率是从 Hugoniot 实验中获得的。剥落强度，以及拉伸应变率在冲击压力高达$～$2.4 GPa 散裂射击。在低冲击压力（$<$0.6 GPa)，由于拉伸应变速率的增加，剥落强度随着冲击压力的增加而略有增加。在高冲击速度下观察到释放熔化（$>$816米 ${\mathrm{秒}}^{-1}$）。通过 X 射线计算机断层扫描，可以揭示冲击恢复样本的三维空隙和裂缝结构。小空隙在低速撞击时显得薄而弯曲，但在高速撞击时变成椭圆形。这种不同的空隙形状可能归因于不同冲击速度下的不同损伤机制。