Experimental Investigation into the Dynamic Response of a Stiffened Flat Plate Loaded Impulsively by an Underwater Shockwave

摘要

The experiment conducted is in support of a broad-based study of underwater shock wave phenomena and the effects they have on ship's hull lethality. An air-backed flat plate with externally machined rectangular stiffeners and a clamped boundary condition was subjected to a shock wave loading generated by an eight pound TNT charge detonated underwater. The plate was instrumented to measure transient strains. The test structure acceleration and free field pressures were also measured. Preshot and postshot calculations were performed using the finite central difference computer code, EPSA (Elasto Plastic Shell Analysis). This code was modified to predict the nonlinear elastoplastic shell response for the plate. The EPSA interface program developed at NPS was utilized to produce color graphics which aided greatly in the analysis.