Predicting the shock mitigating properties of thermoplastic foams

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Abstract
A procedure is presented by which the impact response of polymer foams can be predicted from basic compressive stress‐strain data. The effect of strain rate is accounted for by dividing the cushion into incremental thicknesses. The changing velocity in each increment is related to a changing strain rate by an iterative procedure incorporating experimental data taken over a wide range of strain rates. This procedure represents a considerable savings in the time required to evaluate a cushion over the currently used drop test method.