Abstract
Tensile stress relaxation and stable crack growth under fixed tensile deformation over an extended range of crack speeds were measured on a flexible thermosetting epoxy resin. The experimental results are analysed and compared with the predictions of two theoretical models of fracture kinetics in viscoelastic media, based on different approaches: one theory, developed by Schapery, postulates a criterion of material failure local to the crack tip; the second theory, evolved by Christensen, extends the overall statement of the conservation of energy to systems that dissipate energy due to viscoelastic effects. The observed behaviour is in qualitative agreement with the theoretical predictions. Quantitative discrepancies, however, call for further theoretical refinements.
Résumé
On a mesuré sur une résine epoxy flexible la relaxation de la tension et la croissance stable d'une fissure four une dilatation imposée, et sur une gamme étendue de vitesses de propagation de la fissure.
Lés résultats expérimentaux sont analysés et comparés aux prédictions de deux modèles théoriques de la cinétique de la rupture dans les milieux viscoelastiques, en se basant sur deux approches. L'une, théorique, développée par Schapery, suppose l'application à l'extrémité de la fissure d'un critère de ruine locale du matériau. L'autre, théorique également, déduit par Christensen, élargit le principle général de conservation de l'energie aux systèmes qui dissipent une énergie à cause des effets viscoélastiques.
Le comportement observé est en accord qualitatif avec les prédictions théoriques.
Des divergences quantitatives, toutefois, appellent quelques affinements théoriques.
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Frassine, R., Pavan, A. An application of viscoelastic fracture criteria to steady crack propagation in a polymeric material under fixed deformation. Int J Fract 43, 303–317 (1990). https://doi.org/10.1007/BF00035089
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DOI: https://doi.org/10.1007/BF00035089