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Internal state variable approach for predicting stiffness reductions in fibrous laminated composites with matrix cracksA mathematical model utilizing the internal state variable concept is proposed for predicting the upper bound of the reduced axial stiffnesses in cross-ply laminates with matrix cracks. The axial crack opening displacement is explicitly expressed in terms of the observable axial strain and the undamaged material properties. A crack parameter representing the effect of matrix cracks on the observable axial Young's modulus is calculated for glass/epoxy and graphite/epoxy material systems. The results show that the matrix crack opening displacement and the effective Young's modulus depend not on the crack length, but on its ratio to the crack spacing.
Document ID
19900030909
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lee, Jong-Won
(Texas A&M Univ. College Station, TX, United States)
Allen, D. H.
(Texas A & M University College Station, United States)
Harris, C. E.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 14, 2013
Publication Date
December 1, 1989
Publication Information
Publication: Journal of Composite Materials
Volume: 23
ISSN: 0021-9983
Subject Category
Composite Materials
Accession Number
90A17964
Distribution Limits
Public
Copyright
Other

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