Abstract
A physical model of wedge crack formation at triple junctions in polycrystalline materials is analyzed in this paper. The origin of the crack formation is the sliding of grain boundaries meeting at triple junctions. Based on the dislocation model of grain boundaries, the sliding is attributed to the gliding of grain boundary dislocations (GBDs). Consequently, the resulting crack formation can be analyzed theoretically in terms of the energetics of the piling up of interacting GBDs. The model permits the determination of crack stability or instability as well as the length of the stable crack. Results are obtained in this paper for polycrystalline ice and aluminium.
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