Abstract
Slow crack propagation data in PMMA previously published by Atkins et al. are reanalyzed in terms of a thermodynamic model in which the activation area is inversely proportional to the crack extension force. Important thermodynamic activation parameters are derived from the data. A correlation between the activation area and the crack extension force is observed in many brittle materials; it is compared to Li's general correlation for activation areas in creep.
Résumé
Les résultats expérimentaux sur la propagation lente d'une fissure dans le polyméthacrylate de méthyle, publiés préalablement par Atkins et col, sont analysés de nouveau en fonction d'un modèle thermodynamique dans lequel l'aire d'activation est inversement proportionnelle à la force d'extension de la fissure. Les importants paramètres thermodynamiques d'activation sont derivés à partir des données expérimentales. Pour de nombreux matériaux fragiles, on observe une corrélation entre l'aire d'activation et la force d'extension de la fissure; cette corrélation est comparée à celle de Li pour les aires d'activation en fluage.
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Pollet, J.C., Burns, S.J. An analysis of slow crack propagation data in PMMA and brittle materials. Int J Fract 13, 775–786 (1977). https://doi.org/10.1007/BF00034322
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DOI: https://doi.org/10.1007/BF00034322