Strain localization in open-cell polyurethane foams: Experiments and theoretical model

Pampolini, Giampiero; Del Piero, Gianpietro

doi:10.2140/jomms.2008.3.969

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Strain localization in open-cell polyurethane foams: Experiments and theoretical model

Giampiero Pampolini and Gianpietro Del Piero

Vol. 3 (2008), No. 5, 969–981

DOI: 10.2140/jomms.2008.3.969

Abstract

Confined compression tests performed by the authors on open-cell polyurethane foams reveal the presence of strain localization. After a brief description of the experiments, a theoretical model is proposed. In the model, the foam is represented as a chain of elastic springs with a two-phase strain energy density, and the strain localization is due to a progressive collapse of the springs. The collapse is a sort of continuum instability, which can be attributed to phase transition. An appropriate choice of the material constants leads to a close reproduction of the experimental force-elongation response curves.

Keywords

foam polymers, strain localization, nonconvex strain energy, solid-solid phase change

Milestones

Received: 7 April 2008

Revised: 10 June 2008

Accepted: 20 June 2008

Published: 1 July 2008

Authors

Giampiero Pampolini
Laboratoire de Mécanique et d’Acoustique 31 chemin Joseph-Aiguier 13402 Marseille France

Gianpietro Del Piero
Università di Ferrara Via Saragat 1 44100 Ferrara Italy

Vol. 3, No. 5, 2008

Giampiero Pampolini and Gianpietro Del Piero

Abstract

Keywords

Milestones

Authors