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Convergence of strain energy release rate components for edge-delaminated composite laminatesStrain energy release rates for edge delaminated composite laminates were obtained using quasi 3 dimensional finite element analysis. The problem of edge delamination at the -35/90 interfaces of an 8-ply composite laminate subjected to uniform axial strain was studied. The individual components of the strain energy release rates did not show convergence as the delamination tip elements were made smaller. In contrast, the total strain energy release rate converged and remained unchanged as the delamination tip elements were made smaller and agreed with that calculated using a classical laminated plate theory. The studies of the near field solutions for a delamination at an interface between two dissimilar isotropic or orthotropic plates showed that the imaginary part of the singularity is the cause of the nonconvergent behavior of the individual components. To evaluate the accuracy of the results, an 8-ply laminate with the delamination modeled in a thin resin layer, that exists between the -35 and 90 plies, was analyzed. Because the delamination exists in a homogeneous isotropic material, the oscillatory component of the singularity vanishes.
Document ID
19880057797
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Raju, I. S.
(NASA Langley Research Center Hampton, VA, United States)
Crews, J. H., Jr.
(NASA Langley Research Center Hampton, VA, United States)
Aminpour, M. A.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1988
Publication Information
Publication: Engineering Fracture Mechanics
Volume: 30
Issue: 3 19
ISSN: 0013-7944
Subject Category
Structural Mechanics
Accession Number
88A45024
Funding Number(s)
CONTRACT_GRANT: NAS1-18256
Distribution Limits
Public
Copyright
Other

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