Decomposed crack closure integrals for estimation of SIF variations

Singh, Ripudaman and Patel, SK and Dattaguru, B (1999) Decomposed crack closure integrals for estimation of SIF variations. In: Engineering Fracture Mechanics, 63 (2). pp. 165-178.

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Abstract

The Modified Crack Closure Integral is a popular, convenient and very effective post-processing tool for extracting the stress intensity factors (SIF) from finite element analysis (FEA) of cracked structures in individual or mixed-mode situations. In 3D, the current practice is to estimate the strain energy release rate over the brick element and mark the corresponding SIF to the center of the brick edge representing the crack front. This suppresses the information regarding SIF variations within the element. This paper presents a novel concept of decomposing the nodal forces, nodal displacements and the strain energy release rate into their constituent parts for extracting the SIF variations consistent with the element shape functions. Decomposed Crack Closure Integral (DCCI) has been formulated for linearly varying SIF in an 8-noded brick and parabolically varying SIF in a 20-noded brick element.

Item Type:	Journal Article
Publication:	Engineering Fracture Mechanics
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Finite element methods;Brick elements;3D Crack closure integrals;Stress intensity factor variation.
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	05 Mar 2009 09:47
Last Modified:	19 Sep 2010 05:01
URI:	http://eprints.iisc.ac.in/id/eprint/18310

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