Slow crack growth : models and experiments

Abstract : The properties of slow crack growth in brittle materials are analyzed both theoretically and experimentally. We propose a model based on a thermally activated rupture process. Considering a 2D spring network submitted to an external load and to thermal noise, we show that a preexisting crack in the network may slowly grow because of stress fluctuations. An analytical solution is found for the evolution of the crack length as a function of time, the time to rupture and the statistics of the crack jumps. These theoretical predictions are verified by studying experimentally the subcritical growth of a single crack in thin sheets of paper. A good agreement between the theoretical predictions and the experimental results is found. In particular, our model suggests that the statistical stress fluctuations trigger rupture events at a nanometric scale corresponding to the diameter of cellulose microfibrils.
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Pré-publication, Document de travail
published in EPJ (European Physical Journal). 2007
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Contributeur : Sergio Ciliberto <>
Soumis le : mardi 27 mars 2007 - 13:43:46
Dernière modification le : jeudi 8 février 2018 - 11:07:36
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Stéphane Santucci, Loïc Vanel, Sergio Ciliberto. Slow crack growth : models and experiments. published in EPJ (European Physical Journal). 2007. 〈ensl-00138774〉

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