Fatigue of notched fiber composite laminates. Part 2: analytical and experimental evaluation
The analytical/experimental correlation study was performed to develop an understanding of the behavior of notched boron/epoxy laminates subjected to tension/tension fatigue loading. It is postulated that the fatigue induced property changes (stiffness as well as strength) of the laminate can be obtained from the lamina fatigue properties. To that end, the boron/epoxy lamina static and fatigue data (lifetime, residual stiffness and strength) were obtained initially. The longitudinal and transverse tension data were determined from the (0) and (90) laminate tests, while the in-plane shear data were obtained from the (+ or - 45) sub s/ laminates. The static tests obtained the notched strength and mode of failure while the fatigue tests determined lifetime, damage propagation and residual strength. The failure in static tension occurred in a transverse crack propagation mode.
- Research Organization:
- Materials Sciences Corp., Blue Bell, PA (USA)
- OSTI ID:
- 7320013
- Report Number(s):
- N-77-12133; NASA-CR-145039
- Country of Publication:
- United States
- Language:
- English
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