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The Effect of Fatigue Loading on the Interfacial Shear Properties of SCS-6/Ti-Based MMCS

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Abstract

Fractographic analysis of SCS-6/Ti-24Al-11 Nb(a/o) (Ti-24-11 hereafter) and SCS-6/Ti-1 5V- 3Cr-3Al-3Sn(w/o) (Ti-15-3 hereafter) composites subjected to fatigue crack growth conditions indicates that the interface is prone to wear damage as a result of fiber/matrix sliding. In this study, the effect of fatigue loading on the integrity of the Interface was studied by using fiber pushout testing to compare the interfacial shear strength of composite specimens in the asreceived condition with specimens that were previously subjected to fatigue loading. Fatigue loading was also simulated by pushing fibers back and forth (multiple reverse pushouts). It was concluded that interfacial sliding during fatigue loading results in interfacial damage and degradation of the interfacial shear strength. Tensile testing of extracted fibers exposed to fatigue-induced interfacial damage was also performed to determine the effect of interface damage on the fiber strength. Interfacial damage also resulted in decreased fiber strength of the SCS-6 fiber. Fracture and wear of the outer carbon coatings on the SCS-6 fiber is the main contributing factor in the deterioration of these interfaces.

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References

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Authors and Affiliations

  1. Ohio Aerospace Institute, Brook Park, OH, 44135, USA

    Pete Kantzos

  2. NASA Lewis Research Center, Cleveland, OH, 44135, USA

    J. Eldridge

  3. Pennsylvania State University, University Park, PA, 16802, USA

    D. A. Koss

  4. Sverdrup, Brook Park, OH, 44142, USA

    L. J. Ghosn

Authors
  1. Pete Kantzos
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  2. J. Eldridge
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  3. D. A. Koss
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  4. L. J. Ghosn
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Kantzos, P., Eldridge, J., Koss, D.A. et al. The Effect of Fatigue Loading on the Interfacial Shear Properties of SCS-6/Ti-Based MMCS. MRS Online Proceedings Library 273, 135–142 (1992). https://doi.org/10.1557/PROC-273-135

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  • DOI: https://doi.org/10.1557/PROC-273-135

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