Yielding and post-yield behaviour of closed-cell cellular materials under multiaxial dynamic loading

摘要: The paper focuses on characterisation of yielding and post-yield behaviour metals with closed-cell cellular structure when subjected to multiaxial dynamic loading, considering the influence relative density, base material, strain rate pore gas pressure. Research was conducted by extensive parametric fully-coupled computational simulations using finite element code LS-DYNA. Results have shown that macroscopic yield stress material rises increase while its dependence hydrostatic decreases. limit also rate, remains more or less same at different strain-rates. is strongly influenced choice since materials higher contribute material. By increasing filler pressure increases time surface shifts along axis in negative direction. This means compression delayed due initial occurs compressive opposite true for tensile loading.