Numerical simulation of the influence of thickness of explosion venting plate on the damage and internal load of the cabin

［Objectives］The influence of the explosion venting plate thickness on the effect of the venting in the new type broadside structure adopted by the DDG 1000 destroyer is studied in this paper.［Methods］First，the reliability of the simulation method was verified by experimental data. Then the simulation model of the explosion venting cabin was established using the finite element analysis software. And the principle of thin-plate explosion venting structure was analyzed；the damage failure and load variation under different thin plate thicknesses were studied. Finally，the quadratic function model of specific impulse and deflection changing with the thickness is obtained by function fitting. ［Results］The results show that the failure of the cabin first occurred at the connection between the thin plate and bulkhead，and gradually extended to the corners and edges of bulkhead；the thinner the plate，the likely an explosion venting opening is to form. When an explosion venting opening forms，the whole thin plate flies out of the cabin；the existence of the explosion venting structure has little effect on the initial shock wave overpressure，but it can effectively reduce the quasi-static pressure and specific impulse in the cabin. The main factors causing the deformation of the protective bulkhead are the initial shock wave and the reflected shock wave，and the main factor causing the ultimate damage of the protective bulkhead is the quasi-static pressure acting for a long time.［Conclusions］The research results can provide some reference for the explosion venting design of the ship side cabin structure.