Keywords: closed-cell metal foam, explicit time integration, constitutive model, impact simulation, drop test..

In this paper identification of constitutive material model for closed-cell metal foam used for medium strain rate simulations is presented. The material model is developed based on a series of compression tests at different strain rates. Cubic samples of metallic foam were compressed in a drop tower in which different drop heights and different dead weights were used to achieve the required strain rate. During the compression and compaction of the samples the strains were measured using a high-speed camera to capture the deforming microstructure for DIC strain evaluation. From the stress-strain curves obtained for variable strain rates the parameters of the constitutive model were established. Two element types were used to represent the sample: i) smoothed-particle hydrodynamics element type with full integration scheme and ii) solid element with reduced (one-point) integration scheme. To compare the behaviour of the material models, the sample was modelled using the LS-DYNA explicit finite element solver using either Fu-Chang, low density foam, crushable foam and modified crushable foam material models. The compressive behaviour of the model in the selected region of strain rates was compared with the experimentally measured values.

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