Research on Failure Mode of Explosive Structure in Cabin

Background The damage characteristics of the explosion inside the cabin structure are quite different from the open environment. It is impossible to quickly and accurately predict the failure mode of the structure caused by the internal explosion. Purpose The distribution map of the failure mode and the empirical formula for rapid prediction are obtained. Methods Using a combination of theoretical analysis, numerical simulation and model test verification, the failure mode of the cabin structure under the action of the internal explosive load is investigated. The internal explosion experiment was carried out on the simulation cabin of the ship, and the numerical model was verified by using the shock wave overpressure time history curve and the overpressure peak value at the measuring point at the typical position. According to the dimensional analysis theory, a dimensionless number suitable for analyzing the response of internal explosive structures is proposed, and the dimensionless number is applied to the analysis of implosion damage modes. Results By changing the dimensionless number, a total of 45 numerical simulation calculations have been carried out, and the cabin structure model has been summarized: Plastic large deformation, Disk-shaped cracks, Petal-shaped cracks, Edge crack, Corner damage, Direct shear. Conclusions The research results can realize the rapid prediction of the failure mode of the cabin structure under the internal explosion and provide support for the damage assessment of the semi-armor-piercing projectile to the warship cabin target.