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A numerical study of crack tip constraint in ductile single crystals

Patil, Swapnil D and Narasimhan, R and Mishra, RK (2008) A numerical study of crack tip constraint in ductile single crystals. In: Journal of the Mechanics and Physics of Solids, 56 (6). pp. 2265-2286.

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Abstract

In this work, the effect of crack tip constraint on near-tip stress and deformation fields in a ductile FCC single crystal is studied under mode I, plane strain conditions. To this end, modified boundary layer simulations within crystal plasticity framework are performed, neglecting elastic anisotropy. The first and second terms of the isotropic elastic crack tip field, which are governed by the stress intensity factor K and T-stress, are prescribed as remote boundary conditions and solutions pertaining to different levels of T-stress are generated. It is found that the near-tip deformation field, especially, the development of kink or slip shear bands, is sensitive to the constraint level. The stress distribution and the size and shape of the plastic zone near the crack tip are also strongly influenced by the level of T-stress, with progressive loss of crack tip constraint occurring as T-stress becomes more negative. A family of near-tip fields is obtained which are characterized by two terms (such as K and T or J and a constraint parameter Q) as in isotropic plastic solids.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Single crystal;Constraint effects;Crack tip fields;Modified boundary layer analysis;Finite elements.
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 08 Mar 2010 13:39
Last Modified: 19 Sep 2010 05:56
URI: http://eprints.iisc.ernet.in/id/eprint/25918

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