STP1253: The Role of Frictional Sliding in Transverse Failure of a Titanium Aluminide Composite

    Marshall, DB
    Members of the Technical Staff, Rockwell International Science Center, Thousand Oaks, CA

    Morris, WL
    Members of the Technical Staff, Rockwell International Science Center, Thousand Oaks, CA

    Cox, BN
    Members of the Technical Staff, Rockwell International Science Center, Thousand Oaks, CA

    Kouris, DA
    Professor, Arizona State University, Tempe, AZ

    Pages: 8    Published: Jan 1996


    Abstract

    Circumferential frictional sliding between the matrix and fibers in a titanium aluminide matrix composite has been measured during transverse loading using a displacement mapping method based on differential image analysis. Sliding was detected over all of the interface before initiation of the cracks that eventually caused failure. The results are compared with recent analytical solutions for the interfacial stresses that account for near-neighbor fiber interactions. The location at which sliding initiated coincided with the predicted position of maximum shear stress, while the calculated magnitude of the shear stress when sliding began was equal to the previously measured resistance to frictional sliding in the longitudinal direction. The results indicate that circumferential sliding has a strong influence on the local stress concentrations that lead to failure.

    Keywords:

    interface, sliding, debonding, transverse failure, friction (materials), strain mapping, roughness, crack initiation, titanium, titanium matrix composites, life prediction, titanium alloys, fatigue (materials), modeling


    Paper ID: STP18218S

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP18218S


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