Abstract: A multiscale algorithm with element/mesh momentum transfer of parameters and variable information exchange in coupling transition zone between discrete element method (DEM) and finite element method (FEM) is deduced.Multiscale computation of time and space with coupling of DEM and FEM is established.The algorithm and the model are applied to damage of a pre-tensioned aluminum plate under laser irradiation.Compared with results in FEM model,multiscale model of space and multiscale model of time and space,the multiscale model of time and space by coupling DEM and FEM is shown accurate and highly efficient.Damage of a pre-tensioned aluminum plate under laser irradiation is simulated in multiscale model of time and space from macro-and meso-scale.Simulated results are coincident with experimental resuts.

Key words: laser irradiation, damage behavior, coupling discrete element method and finite element method, multiscale time and space, numerical simulation