Characterization of Polyethylene Foams under Compressive Impact Loading
It has long been recognized that the mechanical behaviour of materials under conditions of rapid loading and impact differs significantly from that under static load application .These differences are specially important for those materials as polymeric foams used as low energy impact absorbing materials. An optimum energy absorbing material needs to dissipate the kinetic energy of the impact while keeping the force on it below some limit, thus resulting in a no-dangerous deceleration of the protected object. The mechanical properties at room temperature of six polyethylene foams with closed cells and different densities have been evaluated in purely compressive impact loading conditions. The energy absorption characteristics have been evaluated through different parameters as the peak of deceleration, the load transmitted, the maximum strain and the impact time. The peak of deceleration is used to obtain the cushion diagrams at five different heights, useful to design energy absorption structures.
J.L. Ruiz-Herrero et al., "Characterization of Polyethylene Foams under Compressive Impact Loading", Materials Science Forum, Vols. 480-481, pp. 513-518, 2005