NASA NTRS · 19860062171
Crack growth direction in unidirectional off-axis graphite-epoxy
Abstract
An 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.
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Herakovich, C. T., Gregory, M. A., Beuth, J. L., Jr.. 1985-01-01. Crack growth direction in unidirectional off-axis graphite-epoxy. https://ntrs.nasa.gov/citations/19860062171
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