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Dynamic compression characteristics of flexible foams. II. Density variation
Author(s) -
Yossifon S.,
Szanto M.
Publication year - 1989
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1989.070380713
Subject(s) - cushioning , materials science , drop (telecommunication) , compression (physics) , composite material , range (aeronautics) , constant (computer programming) , mechanics , similarity (geometry) , dynamic range compression , deformation (meteorology) , computer science , mechanical engineering , physics , engineering , image (mathematics) , artificial intelligence , programming language
Abstract 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/m 3 , 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.