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EnglishConfined 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.
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| Data di pubblicazione: | 2008 | |
| Titolo: | Strain localization in polyurethane foams: Experiments and theoretical model | |
| Autori: | G. Pampolini; G. Del Piero | |
| Rivista: | JOURNAL OF MECHANICS OF MATERIALS AND STRUCTURES | |
| Parole Chiave: | foam polymers; strain localization; non-convex strain energy; solid-solid phase change | |
| 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. | |
| Handle: | http://hdl.handle.net/11392/530328 | |
| Appare nelle tipologie: | 03.1 Articolo su rivista |
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