Characteristics of Flexible Foams Under Impact Conditions-Density Variation, Analysis and Experiments

In Part I {Yossifon and Szanto 1987) the authors have fomulated the mathematical model, based on dimensional similarity parameters, to describe the characteristics of flexible plastic foams under impact conditions. The model assumes that the foam is a rate-dependent material. By using this model one can predict the maximum deformation, the maximum deceleration, and the time-pulse period for a wi de range of drop heights and masses by conducting a few drop tests. The designer of a protective packaging should choose the proper foam for specific needs. This means choosing the shape and the density of the foam for absorbing the shock of a known mass, while ensuring maximum permissible deceleration and deformation.