The Multiple-Impact Performance of High-Density Polyethylene Foam

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Abstract
The performance of high density polyethylene foam in a series of impacts is evaluated. High compressive strains in the range 80–90% cause some permanent buckling of cell walls, but the majority of the deformation recovers within a 24 hour period. A criterion for the performance of the foam in protective helmets is proposed. After one severe impact the performance deteriorates by 30%, but this is much better than for polystyrene foam.

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