A particle-based multiscale simulation procedure within the material point method framework

Abstract

Recent studies of nano energetic composites have underscored the need for an effective multiscale procedure for simulating the responses of discrete nano and sub-micron structures and assemblies to impact loading. A particle-based simulation procedure is proposed with a concurrent link between the dissipative particle dynamics (DPD) method and the material point method (MPM), and a hierarchical bridge from molecular dynamics to DPD, in order to effectively discretize the multiphase interactions associated with multiscale failure evolution. The proposed procedure is illustrated using simulations of the dynamic and impact responses of discrete metallic nano structures. It is shown that the DPD forces can be effectively coarse-grained using the MPM background grid, and that the concurrent link between the MPM and DPD enables near-seamless integration of constitutive modeling at the continuum level with force-based modeling at the mesoparticle level. Additional improvements and applications that build on the current results are discussed.