Transient failure process of explosion containment vessels subjected to adiabatic shear

Destruction tests were performed on a cylindrical explosion containment vessel(ECV) by applying the explosive loads with the increasing charge masses of TNT.An adiabatic shear failure mode for ECVs was presented based on the fracture and the micro-optical observation of the destructed vessel.A damage evolution model for ECVs subjected to adiabatic shear was constructed,where the mechanical conditions including strain rate and strain were linked with the different evolution states of the adiabatic shear bands(ASBs).And these mechanical conditions were employed in the numerical code as the failure criteria to simulate the transient process of the ASB evolution.The simulated fracture profile shows a good agreement with the experimental result.The simulated result indicates that the rate-dependent critical strain,as well as explosive load,governs the adiabatic shear failure mode.Though the initial material imperfection ignites the ASBs,it has a minor influence on the final fracture profile.For the ECVs with the adiabatic shear failure mode,the crack(or ASB) expands faster than for those with the plastic instability failure mode.