Crack dislocation interactions in ionic crystals with rock-salt structure
by K. Higashida, N. Narita
International Journal of Materials and Product Technology (IJMPT), Vol. 14, No. 2/3/4, 1999

Abstract: The modification of the local stress intensity factor due to dislocations near a crack tip has been analysed using 2-D and 3-D potential function methods. Observations of dislocation configurations in ionic crystals with a rock-salt structure have also been made using the etch-pit technique, photoelasticity and high-voltage electron microscopy (HVEM). In thick crystals, hinge-type structures of slip bands were formed along {100} planes ahead of a {100} crack, while in thin crystals dislocation structures corresponding to the 45°-shear-type plastic zone were commonly observed. Based on the observed geometry of the crack tip dislocations, interactions between a crack and dislocations were calculated, and it was found that mode I shielding was induced by the dislocations in both structures.

Online publication date: Mon, 01-Nov-2010

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