Dynamic compression characteristics of flexible foams. II. Density variation
Article first published online: 9 MAR 2003
Copyright © 1989 John Wiley & Sons, Inc.
Journal of Applied Polymer Science
Volume 38, Issue 7, pages 1347–1356, 5 October 1989
How to Cite
Yossifon, S. and Szanto, M. (1989), Dynamic compression characteristics of flexible foams. II. Density variation. J. Appl. Polym. Sci., 38: 1347–1356. doi: 10.1002/app.1989.070380713
- Issue published online: 9 MAR 2003
- Article first published online: 9 MAR 2003
- Manuscript Accepted: 19 OCT 1988
- Manuscript Received: 13 NOV 1987
In Part I, a simple mathematical model was proposed, 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. In the present part we extended the similarity model, by including the density of the foam parameter (for the same material and technological process). The density parameter is significant for systems cushioning with regard to weight and cost constraints. The behavior of flexible foams was studied with density as the variable parameter in a range of 100–240 kg/m3, with constant geometrical dimensions, for a wide range of drop heights and masses. We used the similarity parameters approach to predict the characteristics of the foams for various foam densities. The results show that for particular tested cases, the maximum deformation, the maximum deceleration, and the time pulse-period decrease as the foam density increases.