Application of modified SPH method to numerical simulation of ceramic spallation

 To explore the spallation in ceramic impacted by an aluminum flyer, the modified SPH method was used to simulate the stress wave propagation in ceramic. The results show that the simulated free-surface velocity histories are in agreement with the experimental ones when the discrete particles are distributed non-uniformly. The precision of the results by the modified SPH method is higher than that by CSPM. And a damage evolution equation for ceramic was proposed to numerically simulate the spallation process of laminated ceramic-steel armor plates under pulse loading. The results display that the wave impedance in ceramic is much higher than that in steel and the spallation induced by tension stress is primary. Even though an elastic compression wave propagates in ceramic, the unloading wave reflected by the ceramic-steel interface can also lead to ceramic spallation.