Numerical and Experimental Analysis of Circular Plates Subjected to Underwater Explosion Loading

摘要

Considering shock wave; fluid-structure interaction; cavitations and gas bubble effects, underwater explosion is a very complex phenomenon. Although plastic deformation of thin plates under dynamic loading has been the subject of many researches conducted all around the world; because of usual large deflections and high strain rate effect, it's not completely understood yet. Maximum deflection of fully clamped circular plates under explosion loading has been predicted using numerical analysis by means of LS-DYNA. These predictions have been compared to experimental result of tests that has been conducted on circular steel plates. Using explicit integration method; LS-DYNA is a strong code to analyze large plastic deformations under dynamic. Strain rate effect is taken into account using Cowper-Symonds relation. Comparison shows great agreement between numerical predictions and experimental results.