Modeling and simulation of laser shock waves in elasto-plastic 1D layered specimens. (15th March 2022)

• Record Type: Journal Article
• Authors: Lapostolle, L.; Derrien, K.; Morin, L.; Berthe, L.; Castelnau, O.
• Is Part Of: International journal of solids and structures. Volume 239/240(2022)
• Publication Date: 2022-03-15
• Subjects: Laser shot peening -- Elasto-plastic wave propagation -- Homogenization -- Laminate material -- Numerical simulation; Mechanics, Applied -- Periodicals; Structural analysis (Engineering) -- Periodicals; Elastic solids -- Periodicals; Mécanique appliquée -- Périodiques; Constructions, Théorie des -- Périodiques; Solides élastiques -- Périodiques; Elastic solids; Mechanics, Applied; Structural analysis (Engineering); Periodicals; 624.18
• DOI: 10.1016/j.ijsolstr.2022.111422
• Languages: English
• ISSNs: 0020-7683

Abstract

Abstract: 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.