Mechanics of crack curving and branching — a dynamic fracture analysis

A comparative study on crack curving and branching criteria in dynamic fracture mechanics shows that the criteria based on “advanced cracking” concept correlated best with available experimental data. The crack branching criterion requires as a necessary condition, a critical dynamic stress intensity factor, KIb, and a sufficient condition involving the crack curving criterion. The criteria are used to predict crack curving and crack branching in dynamic photoelastic experiments involving Homalite-100 and polycarbonate fracture specimens, as well as bursting steel and aluminum pipes.RésuméUne étude comparative sur les eritères d'incurvation et d'arborescence d'une fissure en mécanique de rupture dynamique montre qu'un critère basé sur le concept de “fissuration avancée” présente la meilleure corrélation avec les données expérimentales disponibles. Le critère d'arborescence d'une fissure requiert comme condition nécessaire un facteur d'intensité de contrainte dynamique critique, KIb, et comme condition suffisante un critère tenant compte de l'incurvation de la fissure. Les critères sont utilisés pour prédire l'incurvation et l'arborescence d'une fissure au cours d'expériences photo-élastiques en condition dynamique mettant en oeuvre de l'Homalite 100 et du polycarbonate ainsi que des tubes d'acier et d'aluminium en cours d'explosion.

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