Un taux de restitution d’énergie local pilote la fracture des élastomères en fatigue

local GUsing Digital Image Correlation on high-resolution images, the full strain field near the tip of a crack propagating under cyclic loading in an elastomer was characterized. We show unambiguously, and for the first time, the existence of a strongly localized and highly oriented process zone close to the crack tip and propose a simple physical model introducing a local energy release rate glocal = WunloadingH0, where Wunloading is the unloading strain energy density in uniaxial tension at the maximum strain measured at the crack tip, and H0 is the undeformed size of the highly stretched zone in the loading direction. Remarkably, the crack growth rate under cyclic loading is found to fall on a master curve as a function of glocal for three elastomers with different filler contents and crosslinking densities, while the same crack growth rate as a function of the applied macroscopic energy release rate G, differs by two orders of magnitude for the same three elastomers. J Polym Sci Part B : Polym Phys 49 : 1518–1524, 2011

Haut de page



À lire aussi...

Article de Revue sur les Gels et Elastomères

La revue Macromolecules a publié en 2017 une série d’articles de revue dans sa série : 50th anniversary perspective. Voici l’article que j’ai écrit (...) 

> Lire la suite...

Article de Revue sur la Fracture et l’Adhésion des Matériaux Souples

Matteo Ciccotti et moi-même avons publié en mars 2016 un article de revue assez complet contenant les bases théoriques et nos idées personnelles sur (...) 

> Lire la suite...