中文摘要：

采用唐志平等提出的一种简单混合相相变本构模型，运用特征线分析方法，通过对靶板中弹塑性波和宏观相边界传播情况的分析，对一些异常层裂现象产生的机理给出了理论解释。分析表明，（逆）相变过程的发生会强烈地改变靶板中的冲击波波形，形成所谓的三波结构和稀疏冲击波，板中某些位置还可能出现驻定相边界，各波系间的相互作用更加复杂，从而可能导致一些特殊层裂现象的发生。

英文摘要：

With a simple multi-phase mixture model proposed by TANG Zhi-Ping et al earlier,we have studied the propagation of the elastic and plastic waves as well as the macroscopic phase boundary in the targets by characteristic line method, and the mechanism of the abnormal spall phenomena mentioned above are explained theoretically. The investigation shows that （reverse） phase transition can strongly affect the profiles of the shock waves,leading to the so-called three-wave structure and the release shock waves, and the static phase boundary may appear somewhere in the plates. The more complex interactions of the waves in the plates may cause some special spall phenomena.