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Universal crack closure integral for SIF estimation

Singh, R and Carter, BJ and Wawrzynek, PA and Ingraffea, AR (1998) Universal crack closure integral for SIF estimation. In: Engineering Fracture Mechanics, 60 (2). pp. 133-146.

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Abstract

Numerical analysis of cracked structures often involves numerical estimation of stress intensity factors (SIFs) at a crack tip/front. A newly developed formulation called universal crack closure integral (UCCI) for the evaluation of potential energy release rates (PERRs) and the corresponding SIFs is presented in this paper. Unlike the existing element dedicated forms of crack closure integrals (MCCI, VCCI) with application limited to finite element analysis, this new numerical SIF/PERR estimation technique is independent of the basic stress analysis procedure, making it universally applicable. The second merit of this procedure is that it avoids the generally error-producing zones close to the crack tip/front singularity. The UCCI procedure, based on Irwin's original CCI, is formulated and explored using a simple 2D problem of a straight crack in an infinite sheet. It is then applied to some three-dimensional crack geometries with the stresses and displacements obtained from a boundary element program.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: universal crack closure integral;3D cracks;potential energy release rate (PERR);stress intensity factor (SIF) estimation; boundary element solution.
Department/Centre: Others
Date Deposited: 09 Dec 2009 12:28
Last Modified: 02 May 2011 07:41
URI: http://eprints.iisc.ernet.in/id/eprint/19430

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