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The dynamic energy release rate for two parallel steadily propagating mode III cracks in a viscoelastic body

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Abstract

The dynamic steady-state propagation of two parallel semi-infinite, mode III cracks is considered for a general, infinite, homogeneous, and isotropic linearly viscoelastic body. A Barenblatt type failure zone is assumed to exist at the crack tip and a formula for the energy release rate is derived which provides immediate comparisons with the corresponding single crack problem. The influence of crack speed, crack separation, and material properties upon the energy release rate are illustrated with numerical calculations for both power-law material and a standard linear solid. Results for the elastic and quasi-static viscoelastic problems are deduced as limiting cases of the analysis.

Résumé

On reconsidère le problème d'une fissuration de Mode I dans des plaques soumises à une contrainte de membrane et à flexion. Le but est d'examiner de manière plus approfondie certaines caractéristiques analytiques du problème et de fournir de nouveaux résultats. On compare la formulation et les résultats fournis par la théorie classique et par la théorie des plaques de Reissner dans le cas de fissures traversantes ou partiellement traversantes. Pour les fissures de surface, on emploie une solution par éléments finis à trois dimensions comme base de comparaison.

On obtient la solution et on fournit les résultats pour un problème d'interaction fissure-contact dans une plaque comportant une fissure traversante soumise à flexion pure et pour le problème d'interaction de fissures. Une procédure est également développée pour traiter le problème de la croissance subcritique d'une fissure et pour suivre l'évolution d'une fissure en propagation.

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Schovanec, L., Walton, J.R. The dynamic energy release rate for two parallel steadily propagating mode III cracks in a viscoelastic body. Int J Fract 41, 133–155 (1989). https://doi.org/10.1007/BF00018481

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  • DOI: https://doi.org/10.1007/BF00018481

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