Coupled simulation of explosion-driven fracture of cylindrical shell using SPH-FEM method

A coupled Smoothed Particle Hydrodynamics-Finite Element Method (SPH-FEM) method was presented to simulate the dynamic fracture of cylindrical shell subjected to internal explosion. The movement of detonation products was modeled by SPH, and the fracture response of cylindrical shell was modeled by FEM, where they were coupled together by a penalty-based coupling approach. A rate-dependent failure criterion which was proposed and verified in our previous work was employed in the simulation to account for the adiabatic shear failure of the cylindrical shell. Also, the decoupled simulation was conducted to make a comparison with the coupled SPH-FEM simulation above. Results showed the interaction between blast wave and cylindrical shell, the dynamic crack propagation behavior and the leakage of detonation products. It is found that the coupled SPH-FEM method can well handle the fluid-structure interaction (FSI) problem which involves local topology changes and ruptures. Compared with decoupled simulation, the coupled SPH-FEM simulation gives a more reliable prediction of the final fracture morphology of cylindrical shell. The decoupled simulation tends to present a result with severer bulging deformation but smaller fracture size compared with the real situation.