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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
19850017122
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
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 Inst. and State Univ. Blacksburg, VA, United States)
Date Acquired
September 5, 2013
Publication Date
December 1, 1984
Subject Category
Composite Materials
Report/Patent Number
IR-48
CCMS-84-17
NAS 1.26:175752
NASA-CR-175752
VPI-E-84-34
Report Number: IR-48
Report Number: CCMS-84-17
Report Number: NAS 1.26:175752
Report Number: NASA-CR-175752
Report Number: VPI-E-84-34
Accession Number
85N25433
Funding Number(s)
CONTRACT_GRANT: NAG1-343
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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