Modeling the compressive stress–strain response of polymeric foams

Authors

  • G. Spathis,

    1. Department of Applied Mathematical and Physical Sciences, Section of Mechanics, National Technical University of Athens, 5 Heroes of Polytechnion, Athens GR-15773, Greece
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  • E. Kontou

    Corresponding author
    1. Department of Applied Mathematical and Physical Sciences, Section of Mechanics, National Technical University of Athens, 5 Heroes of Polytechnion, Athens GR-15773, Greece
    • Department of Applied Mathematical and Physical Sciences, Section of Mechanics, National Technical University of Athens, 5 Heroes of Polytechnion, Athens GR-15773, Greece===

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Abstract

The mechanical behavior of cellular materials appears to have, for both open and closed cells, similar characteristics. The compressive stress–strain diagram contains a nearly elastic regime; this leads to a limit load, followed by a plateau extending to a strain of about 50% on average. All of the main features of this curve are related to the material's microstructure. In this study, taking into account the complex deformation mechanisms occurring in a cellular material under external loading, we introduced a statistical micromechanics model. The geometry of our analysis was based on a previous study, where the deformation of the individual struts was connected to the macroscopic deformation tensor. Assuming further that deformation was separated into elastic and viscoplastic parts and following a specific kinematic procedure, we simulated the compressive stress–strain response, the rate dependence, and the loading–unloading behavior of polymeric foam materials. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011

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