Numerical and Experimental Investigation to the Contact Forces of Simulated Granular Explosive

摘要

The internal contact forces and their transferring in simulated explosive are studied by combined numerical and experimental methods. Plexiglas discs are used to simulate explosive crystals to form 2-dimentional assemblies and dynamic loading to the assemblies is actualized to simulate the unexpected mechanical loading scenarios for explosives. The force/stress chains are observed by the shadow caustics patterns. The experimental and numerical results show that the force/stress chains are the major transferring models for contact forces in heterogeneous media and they shows large fluctuations along their spreading paths. It is also found that the high stress localization occurred in the bifurcation point of force chains and contacted forces in the major chain decay as a power law along the external impact direction but, oscillate in the branch chains.