Modified Crack Closure Integral Using Six-Noded Isoparametric Quadrilateral Singular Elements

Narayana, Badari K and Dattaguru, B and Ramamurthy, TS and Vijayakumar, K (1990) Modified Crack Closure Integral Using Six-Noded Isoparametric Quadrilateral Singular Elements. In: Engineering Fracture Mechanics, 36 (6). pp. 945-955.

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Abstract

Six-noded, isoparametric serendipity type quadrilateral regular/singular elements are used for the estimation of stress intensity factors (SIF) in linear elastic fracture mechanics (LEFM) problems involving cracks in two-dimensional structural components. The square root singularity is achieved in the six-noded elements by moving the in-side nodes to the quarter point position. The modified crack closure integral (MCCI) method is adopted which could generate accurate estimates of SIF for a relatively coarse mesh. The equations for strain energy release rate and SIF are derived for mixed mode situations using six-noded quadrilateral elements at the crack tip. The model is validated by numerical studies for a centre crack in a finite plate under uniaxial tension. a single edge notched specimen under uniaxial tension, an inclined crack in a finite rectangular plate and cracks emanating from a pin-loaded lug (or lug attachment). The results compare very well with reference solutions available in the literature.

Item Type:	Journal Article
Publication:	Engineering Fracture Mechanics
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	02 Jul 2007
Last Modified:	18 Jan 2012 07:13
URI:	http://eprints.iisc.ac.in/id/eprint/11344

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