Characterization of interface sliding damage in SiC fiber-reinforced Ti-15-3 matrix composite by cyclic fatigue
Journal Article
·
· Acta Materialia
- Univ. of Tokyo (Japan). Inst. of Industrial Science
An experimental investigation was made on the effect of fatigue on the change of interface shear friction stress in SiC (SCS-6) fiber-reinforced Ti-15-3 composite. An unnotched composite was subjected to a tension-tension fatigue test (R = 0.1, f = 2 Hz) with applied stresses of 450 and 670 MPa. Thin specimen push-out and push-back tests were carried out for both pristine and fatigued composites to examine the change of interface shear friction stress. A change of morphology and roughness of the extracted fiber surface were observed by AFM. The surface roughness became smoother as the fatigue progressed while the shear frictional stress decreased. The number of cycles loaded and stress applied significantly affected the shear friction stress, respectively. Increasing the number of cyclic loading and applied stress, respectively, resulted in a reduction in the shear friction resistance. The dominant mechanisms for the reduction in interface shear friction stress were: (i) asperity wear of the SCS coating layer, and (ii) relaxation of radial residual thermal stress in the matrix. A model prediction was made incorporating both factors and the result explained the reduction of the interface shear friction stress by the fatigue test.
- Sponsoring Organization:
- Ministry of Education, Science and Culture (Japan); Japanese Science and Technology Agency (Japan)
- OSTI ID:
- 514651
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 6 Vol. 45; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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