Modeling and simulation of laser shock waves in elasto-plastic 1D layered specimens

The aim of this paper is to study the effect of microstructure heterogeneity upon elasto-plastic wave propagation generated during laser shot peening. We consider a simplified elasto-plastic laminate specimen subjected to uniaxial strain. The microstructure is composed of two phases alternating periodically and perfectly bonded together. The associated PDE system is solved using a high-resolution Godunov scheme, allowing to study the wave propagation in the heterogeneous structure. It is found that, even for a small mechanical contrast between the two phases, the considered laminate microstructure has a significant effect on the distribution of plastic strain. In addition, an elasto-plastic homogenization of the laminate has been carried out, and the resulting Homogeneous Equivalent Medium (HEM) has been used to decrease the computation time of the wave propagation. The HEM-based model is able to reproduce accurately the full-field solution in terms of distribution of mean plastic strain within the specimen and its fluctuation between the two phases.

Automated summary

This paper studies the effect of microstructure heterogeneity on the propagation of elasto-plastic waves during laser shot peening. The experiment found that even a small mechanical contrast between the phases has a significant effect on the distribution of plastic strain. In addition, an elasto-plastic homogenization method has been used to reduce the computation time of wave propagation.