Influence of crack tip constraint on void growth in ductile FCC single crystals

Biswas, P and Narasimhan, R and Tewari, A (2011) Influence of crack tip constraint on void growth in ductile FCC single crystals. In: Materials Science and Engineering A, 528 (3). pp. 823-831.

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Abstract

Effect of constraint (stress triaxiality) on void growth near a notch tip in a FCC single crystal is investigated. Finite element simulations within the modified boundary layer framework are conducted using crystal plasticity constitutive equations and neglecting elastic anisotropy. Displacement boundary conditions based on model, elastic, two term K-T field are applied on the outer boundary of a large circular domain. A pre-nucleated void is considered ahead of a stationary notch tip. The interaction between the notch tip and the void is studied under different constraints (T-stress levels) and crystal orientations. It is found that negative T-stress retards the mechanisms of ductile fracture. However, the extent of retardation depends on the crystal orientation. Further, it is found that there exists a particular orientation which delays the ductile fracture processes and hence can potentially improve ductility. This optimal orientation depends on the constraint level. (C) 2010 Published by Elsevier B.V.

Item Type:	Journal Article
Publication:	Materials Science and Engineering A
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Fracture; Crystal plasticity; Ductility; Finite element analysis
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	25 Mar 2011 06:29
Last Modified:	25 Mar 2011 06:29
URI:	http://eprints.iisc.ac.in/id/eprint/35995

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