Bibliographic Details
| Title: |
Dynamique de mousses poroélastiques. |
| Alternate Title: |
On the dynamics of poroelastic foams. |
| Authors: |
Sobac, Benjamin1, Colombani, Mathieu1, Forterre, Yoël1 yoel.forterre@polytech.univ-mrs.fr |
| Source: |
Mécanique & Industries. May/Jun2011, Vol. 12 Issue 3, p231-238. 8p. |
| Subjects: |
Foam, Polyurethanes, Colloids, Elasticity, Strength of materials |
| Abstract (English): |
We experimentally investigate the dynamics of soft polyurethane open foams immersed in viscous fluids. The elastic foam is initially compressed in one direction and then suddenly released. The velocity field of the foam and the dynamic pressure of the interstitial fluid (pore pressure) are measured during the swelling of the foam. For small initial compactions, the foams relax exponentially to equilibrium with a diffusive dynamics in quantitative agreements with classical theories of soil consolidation. On the other hand, for large initial compactions, the dynamics is strongly inhomogeneous and occurs through a localized decompaction front. A simple two-fluids model semi-quantitatively predicts the observations and links the existence of a localized front to the highly non-linear mechanical response of the foam. [ABSTRACT FROM AUTHOR] |
| Abstract (French): |
Nous étudions expérimentalement la dynamique de mousses élastiques (mousse ouverte flexible en polyuréthane) plongées dans un fluide visqueux. La mousse est initialement comprimée dans une direction puis brutalement relâchée. Le champ de vitesse de la mousse et la pression du fluide interstitiel (pression de pore) sont mesurés au cours de la décompaction du système. Pour des petites compactions initiales, on observe que la mousse relaxe exponentiellement vers son état d'équilibre, avec une dynamique diffusive en accord quantitatif avec les théories classiques de consolidation des sols. En revanche, pour des grandes compactions initiales, la dynamique de relaxation est inhomogène et se déroule à travers un front de décompaction. Un modèle diphasique simple permet de prédire semi-quantitativement les observations et relie l'existence du front au caractère fortement non-linéaire de la réponse mécanique de la mousse. [ABSTRACT FROM AUTHOR] |
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| Database: |
Engineering Source |
