Stress Wave Analysis of Abnormal Spall in Metal Target Relating to Phase Transition

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.