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Crack growth direction in unidirectional off-axis graphite-epoxyAn anisotropic elasticity crack tip stress analysis is implemented using three crack extension direction criteria (the normal stress ratio, the tensor polynominal and the strain energy density) to predict the direction of crack extension in unidirectional off axis graphite-epoxy. The theoretical predictions of crack extension direction are then compared with experimental results for 15 deg off axis tensile coupons with center cracks. Specimens of various aspect ratios and crack orientations are analyzed. It is shown that only the normal stress ratio criterion predicts the correct direction of crack growth.
Document ID
19860062171
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Herakovich, C. T. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Gregory, M. A. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Beuth, J. L., Jr. (Virginia Polytechnic Institute and State University Blacksburg, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1985
Subject Category
Composite Materials
Accession Number
86A46909
Funding Number(s)
CONTRACT_GRANT: NAG1-343
Distribution Limits
Public
Copyright
Other

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