Effect of temperature on fiber/matrix interface sliding stress in SCS-6/Timetal{reg_sign}21S
- Univ. of Dayton Research Inst., OH (United States)
- Air Force Research Lab., Wright Patterson AFB, OH (United States). Materials and Mfg. Directorate
Many potential applications exist for components manufactured using Titanium Matrix Composites (TMC) because of the high specific strength and stiffness the material exhibits at elevated temperature. Several methods have been employed to determine or deduce the fiber/matrix interfacial shear stress, {tau}. Fiber push-out and pull-out techniques have been used to measure {tau}, but efforts to apply these values to accurate fatigue crack growth prediction have failed. Other methods include determination of {tau} as a fitting parameter based on correlation with parameters measured during fatigue crack growth tests. A common approach is to calibrate {tau} using the crack length versus cycles data (a-N) from a fully bridged crack growth test at a given applied stress. Subsequently, this value of {tau} has been shown to have predictive capabilities for crack opening displacements (COD), slip lengths, and a-N at other stress levels and volume fractions. Application of fiber bridging models to components under service loading conditions requires {tau} as a function of temperature over a wide range of crack lengths. Hence, this paper discusses the determination of {tau} as a function of temperature from COD measured in situ during crack growth along long fully-bridged cracks in SCS-6/TIMETAL{reg_sign}21S. Two commonly used shear lag models were evaluated during this study.
- OSTI ID:
- 338405
- Journal Information:
- Scripta Materialia, Vol. 42, Issue 5; Other Information: PBD: 5 Feb 1999
- Country of Publication:
- United States
- Language:
- English
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