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Summary A simple method for determining volumetric stress/strain relationship has been developed for structural foams. This procedure yields information that can be used in FEA for foam‐like materials, up to the start of the densification. The simulation and test data show a good correlation up to the start of material densification. This is because the material model in the computer code ABAQUS is only capable of modeling a bilinear response and does not address densification effects. No attempt was made to study strain rate effects. They don't appear to be significant in this particular foam material, but may be important in other structural foams under high speed impact.