Shock wave-loaded plates

The present paper reports on modeling, numerical simulation, and experiment al investigation of plates subjected to impulsive loading. The kinematical hypothesis used for the theoretical description of the transient response i ncludes transverse shear deformations, rotary inertia, and geometrical nonl inear effects. The material modeling accounts for elastic-plastic behavior, isotropic and kinematical hardening, and strain rate sensitivity. The nume rical simulation of the transient inelastic vibrations is performed using i soparametric finite elements. Both the Chaboche and the BodnerPartom viscop lastic constitutive laws are used to trace the evolution of the material ch aracteristics in the framework of a layered shell model. The theoretical an d numerical developments are checked by experimental investigations of thin steel plates subjected to shock waves. These experiments are performed in a shock tube with various impact periods and loading histories. The topics addressed in this report include (a) the correlation of experimental and si mulated transient inelastic response using the Chaboche and Bodner-Partom m odels, (b) the sensitivity of the predicted structural response to variatio ns of the material parameters identified on the basis of uniaxial tension t ests, (c) the effect of the transverse shear stress distribution on the loc al evolution of the material behavior and on the global dynamic response, ( d) the evolution of deflections, stresses, and plastic zones under blast lo ading conditions. (C) 2001 Elsevier Science Ltd. All rights reserved.