ON THE MODELLING OF COMPRESSIVE RESPONSE OF CLOSED-CELL ALUMINIUM FOAMS UNDER HIGH-STRAIN RATE LOADING

P. Koudelka, P. Zlámal, T. Fila

Abstract

Porous metals and particularly aluminium foams are attractive materials for crash applications where constructional elements have to be able to absorb considerable amount of deformation energy while having as low weight as possible. Compressive behaviour for medium impact velocities can be experimentally assessed from a series of drop-tower impact tests instrumented with accelerometer and high-speed camera. However to predict such behaviour a proper modelling scheme has to be developed. In this paper drop-tower impact tests of Alporas aluminium foam were used for development of a material model for explicit finite element simulations of high-strain rate deformation process using LS-DYNA simulation environment. From the material models available low density foam, Fu-Chang’s foam, crushable foam and modified crushable foam models were selected for simulations using smoothed-particle hydrodynamics and solid formulations respectively. Numerical simulations were performed in order to assess constitutive parameters of these models and identify material model describing deformation behaviour of Alporas with the best accuracy.

Keywords

aluminium foam, high strain-rate compression, finite element modelling

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IMEKO-YSESM-2014-014.pdf

DOI

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IMEKO TC

TC15 - Experimental Mechanics

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