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Treatment of singularities in a middle-crack tension specimenA three-dimensional finite-element analysis of a middle-crack tension specimen subjected to mode I loading was performed to study the stress singularity along the crack front. The specimen was modeled using 20-node isoparametric elements with collapsed nonsingular elements at the crack front. The displacements and stresses from the analysis were used to estimate the power of singularities, by a log-log regression analysis, along the crack front. Analyses showed that finite-sized cracked bodies have two singular stress fields. Because of two singular stress fields near the free surface and the classical square root singularity elsewhere, the strain energy release rate appears to be an appropriate parameter all along the crack front.
Document ID
19900063508
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Shivakumar, K. N.
(Analytical Services and Materials, Inc. Hampton, VA, United States)
Raju, I. S.
(Analytical Services and Materials, Inc. Hampton, VA, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1990
Subject Category
Structural Mechanics
Meeting Information
Meeting: ASTM National Symposium on Fracture Mechanics
Location: Annapolis, MD
Country: United States
Start Date: June 28, 1988
End Date: June 30, 1988
Sponsors: ASTM
Accession Number
90A50563
Funding Number(s)
CONTRACT_GRANT: NAS1-18599
CONTRACT_GRANT: NAS1-18256
Distribution Limits
Public
Copyright
Other

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