Multiscale simulation of impact response between two microrods with different nano-structures
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[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] Multiscale simulation is the field of solving physical problems which have important features at multiple scales; it is aimed to calculation of material properties or system behavior on one level using information or models from different levels. To better simulate multi-phase interactions involving failure evolution, the Material Point Method (MPM) has evolved for almost twenty years since its first paper was published in 1994, which has demonstrated its capabilities in addressing such problems as impact, upsetting, penetration, and contact. A multiscale material point method (MMPM) is proposed via both hierarchical and concurrent schemes. Molecular dynamics (MD) at nanoscale is linked with cluster dynamics (CD) at sub-micron scale via a hierarchical approach while CD is embedded into the MPM via a concurrent approach for establishing the multiscale equation of state (EoS). An impact problem of two nanorods with different nano structures are simulated by MMPM, and a transition region is not required between different spatial scales with the proposed approach.
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