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

Lucas Lapostolle (1) , Katell Derrien (1) , Léo Morin (1) , Laurent Berthe (1) , Olivier Castelnau (1)

1 PIMM - Laboratoire Procédés et Ingénierie en Mécanique et Matériaux

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.

Mots clés: Applied Mathematics; Mechanical Engineering; Mechanics of Materials; Condensed Matter Physics; General Materials Science; Modeling and Simulation; Laser shot peening; Elasto-plastic wave propagation; Homogenization; Laminate material; Numerical simulation

Domaines: Sciences de l'ingénieur [physics]

Lucas Lapostolle, Katell Derrien, Léo Morin, Laurent Berthe, Olivier Castelnau. Modeling and simulation of laser shock waves in elasto-plastic 1D layered specimens. International Journal of Solids and Structures, 2022, 239-240, pp.111422. ⟨10.1016/j.ijsolstr.2022.111422⟩. ⟨hal-03591184⟩