Interfacial fatigue in a fiber reinforced metal matrix composite
- Univ. of California, Santa Barbara, CA (United States). Materials Dept.
An experimental investigation of interfaces fatigue in a fiber reinforced metal matrix composite has been conducted. For this purpose, the cyclic traction law (the relationship between the fiber stress and the pullout displacement) was measured using fiber pullout tests. On the first loading cycle, the traction law was found to be parabolic, in accord with predictions of a micromechanical model based on a constant interfaces sliding stress. Upon subsequent unloading and re-loading, the relationship changed, following trends which suggest that the sliding resistance degrades with cyclic sliding. Such effects have been confirmed through SEM examinations of the fiber coatings following fatigue testing. Furthermore, the degradation was found to be greatest near the plane of the matrix crack. The results are consistent with the notion that the degradation in sliding stress occurs most rapidly in regions where the relative sliding distance (fiber/matrix) is greatest. A phenomenological model incorporating such degradation is presented and compared with the experimental measurements.
- OSTI ID:
- 7180788
- Journal Information:
- Acta Metallurgica et Materialia; (United States), Vol. 42:8; ISSN 0956-7151
- Country of Publication:
- United States
- Language:
- English
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