Stresses in fibers bridging a crack growing in center-cracked unidirectional SCS-6/TIMETAL21{reg_sign}S composite subjected to fatigue loading
- Univ. of Dayton Research Institute, OH (United States). Structural Integrity Division
This paper discusses the results of an experimental and analytical investigation of bridging fiber stress distribution for a crack growing in a TIMETAL{reg_sign}21S metal matrix composite reinforced with silicon-carbide (SCS-6) fibers. The fatigue crack growth tests were conducted at room temperature using the center-cracked tension geometry with the fibers oriented parallel to the loading direction. During the crack growth tests, crack opening displacement ranges were measured at different locations along the crack using a laser interferometric displacement gage (IDG) system. At the end of the test, residual crack opening displacements (at zero applied load) were measured using a scanning electron microscope. A procedure was developed to generate the absolute crack opening displacement profiles at different stress levels using the measured residual and laser IDG displacements. Using the weight function method, the bridging fiber stress distributions were determined by correlating the predicted and measured crack opening displacements. The results show that the absolute bridging stress and the bridging stress range distributions have different shapes. The bridging fiber stress distribution at the maximum applied fatigue stresses are non-uniform, increasing rapidly from a low value at the crack tip to near-constant away from the crack tip. The bridging fiber stress range is near-linear with non-zero stresses at the crack tip. The magnitude of the bridging stress range is proportional to the applied load.
- OSTI ID:
- 89828
- Report Number(s):
- CONF-9409291-; ISBN 1-56676-220-0; TRN: IM9536%%258
- Resource Relation:
- Conference: 9. technical conference of the American Society for Composites, Newark, DE (United States), 20-22 Sep 1994; Other Information: PBD: 1994; Related Information: Is Part Of Proceedings of the American Society for Composites: Ninth technical conference; PB: 1319 p.
- Country of Publication:
- United States
- Language:
- English
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