Temperature dependence of tensile mechanical properties in SiC fiber-reinforced Ti matrix composite
- Univ. of Tokyo (Japan). Inst. of Industrial Science
Temperature dependence of longitudinal Young's modulus, tensile strength, and interfacial shear stress in SiC(SCS-6) fiber-reinforced commercially pure Ti matrix composites have been examined experimentally in the temperature range from room temperature to 873 K. Young's modulus and tensile strength of the composite was discussed in relation to the interfacial shear stress transfer mechanism. Young's modulus was independent of interfacial shear stress, however, the tensile strength depended strongly on the interfacial shear stress. With increasing test temperature, the interfacial shear stress decreased, a behavior which originated from an insufficient stress transfer between fiber and matrix due to decrease of shear yield stress of the matrix. The tensile strength of the composite depended on the potential of shear stress transfer at the interface, and the temperature dependence of the tensile strength was quantitatively explained by the proposed in-direct stress transfer model.'' The model suggests when the length of the composite in the longitudinal direction was sufficiently long, R[sub f][bar [sigma]][sub fu]/[sigma][sub my]L[sub g][approx]0 where R[sub f] is the radius of fiber, [bar [sigma]][sub fu] is the mean tensile strength of fiber, [sigma][sub my] is the yield stress of matrix, L[sub g] is the length of composite, the tensile strength of the composite approaches the rule of mixture prediction for continuous fiber-reinforced metals even at elevated temperatures. This result also indicated that the tensile strength of the composite depended strongly on the gage length of the composite L[sub g], and this tendency increased with decrease in the shear yield stress of the matrix.
- OSTI ID:
- 6915870
- Journal Information:
- Acta Metallurgica et Materialia; (United States), Vol. 42:9; ISSN 0956-7151
- Country of Publication:
- United States
- Language:
- English
Similar Records
Interfacial characterization of carbon fiber/epoxy composites
Influence of interfacial shear strength on the mechanical properties of SiC fiber reinforced reaction-bonded silicon nitride matrix composites