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Energy dissipation associated with crack extension in an elastic-plastic materialCrack extension in elastic-plastic material involves energy dissipation through the creation of new crack surfaces and additional yielding around the crack front. An analytical procedure, using a two-dimensional elastic-plastic finite element method, was developed to calculate the energy dissipation components during a quasi-static crack extension. The fracture of an isotropic compact specimen was numerically simulated using the critical crack-tip-opening-displacement (CTOD) growth criterion. Two specimen sizes were analyzed for three values of critical CTOD. Results from the analysis showed that the total energy dissipation rate consisted of three components: the crack separation energy rate, the plastic energy dissipation rate, and the residual strain energy rate. All three energy dissipation components and the total energy dissipation rate initially increased with crack extension and finally reached constant values.
Document ID
19880033442
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Shivakumar, K. N.
(NASA Langley Research Center Hampton, VA, United States)
Crews, J. H., Jr.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Publication Information
Publication: Engineering Fracture Mechanics
Volume: 28
Issue: 3, 19
ISSN: 0013-7944
Subject Category
Structural Mechanics
Accession Number
88A20669
Distribution Limits
Public
Copyright
Other

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