Effect of loading rate and initial density on the mechanical response of polyurethane elastomer foams
Résumé
This study deals with the effects of initial density and loading rate on the mechanical response of thermoplastic polyurethane foams under uniaxial cyclic tensile loading. Tests were performed at two different loading rates with five initial density levels. Volume changes were measured during mechanical cycles using the mark tracking method. The mechanical response obtained for each specimen and loading condition has shown that the lower density, the lower the stiffness and the higher the residual strain. Stress softening during the mechanical cycles has been characterized using an energetic approach. Results show that the density has not significant effect on the softening. Moreover, volume change measurements have shown that specimen volume increases significantly with the stretch applied. Volume change strongly depended on the initial density.
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