Research on damage effect of underwater multipoint synchronous explosion shock waves on air-backed clamped circular plate

Abstract

An underwater multipoint synchronous explosion can enhance the damage effect of an underwater explosion shock wave on a structure. This study investigates the damage effect of an underwater multipoint synchronous explosion on an air-backed clamped circular plate. First, we derive the theoretical formula for the superposition of underwater explosion shock wave pressure. A numerical simulation was conducted using the ALE (Arbitrary Lagrange-Euler) algorithm to investigate the damage effect of underwater explosion shock wave pressure on a clamped circular plate, and an experiment was conducted in a tank. By changing the conditions (explosive distance, explosive spacing, and number of explosives), the damage effect of an underwater multipoint synchronous explosion on an air-backed clamped circular plate was thoroughly investigated. The results show that the shock wave pressure of an underwater two-point synchronous explosion has a nonlinear superposition effect that is approximately 1.48–2.52 times greater than that of a single-point explosion. As the distances between the explosives and between the explosives and the plate decrease, the damage effect increases. When the total mass of the explosives is constant, the synchronous explosion of eight explosives has the greatest damage effect on the clamped circular plate.