Abstract
The purpose of this research was to examine problems associated with the propagation of cracks near a free surface and near the interface of a glass/epoxy bonded system. Crack propagation was induced by placing Knoop indentations in the glass at various sites adjacent to and remote from the surface or interface. These experimental studies were supplemented by finite element stress analysis. Experiments show that for an indent parallel to the surface or interface, the initial direction of crack propagation from the indent is always toward the surface or interface and then as the crack approaches the surface or interface, the crack path deviates away from the surface. Results of finite element analysis show that the initial direction of crack propagation is in the direction normal to the maximum principal stress at the crack tip.
Résumé
Le but de cette recherche a été d'examiner les problèmes associés à la propagation des fissures près d'une surface libre et au voisinage de l'interface d'un assemblage verre-époxy collé. La propagation d'une fissure était blovoquée par des empreites Knoop en divers endroits adjacents ou éloignés de la surface ou de l'interface. Ces tudes expérimentales ont été complétées par une analyse des contraintes par éléments finis. Les essais ont montré The pour une empreinte parallèle à la surface ou à l'interface, la direction initiale de la propagation d'une fissure depuis cette empreinte est toujours orientée vers la surface libre ou vers l'interface. Ensuite, au fur et à mesure que fissure se rapproche de la surface libre ou de l'interface, son chemin s'en détourne. Les résultats de l'analyse par Sléments finis montrent que la direction initiale de propagation de la fissure est normale à la tension principale maximum à l'extrémité de la fissure.
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Lardner, T.J., Ritter, J.E., Shiao, M.L. et al. Behavior of indentation cracks near free surfaces and interfaces. Int J Fract 44, 133–143 (1990). https://doi.org/10.1007/BF00047064
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DOI: https://doi.org/10.1007/BF00047064