STP1157

    Acoustic Emission Monitoring of Fatigue in Titanium Aluminide XD Composite

    Published: Jan 1992


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    Abstract

    The feasibility of acoustic emission (AE) monitoring of fatigue crack growth in titanium aluminide XD composites was investigated. Under tension-tension and compression-compression loading, the total accumulated number of AE events corresponds closely to the fatigue crack growth. The majority of the AE occurs near the maximum load during uploading. In the tension fatigue test, the AE is controlled by the stress intensity factor, and its relationship is given by the equations An=(1.1×103)·(Kmax)6.3 An=(1.1×103)·(ΔK)6.3 where An is the total number of AE events, Kmax the maximum stress intensity factor, and ΔK the range of stress intensity factor.

    Keywords:

    acoustic emission, elastic wave, piezoelectric sensor, titanium aluminides, exothermic dispersion (XD) composite, matrix, reinforcement, fatigue (materials), crack growth, stress intensity factor, plastic deformation, fracture (materials), microstructure, fractographs, advanced materials


    Author Information:

    Lee, EU
    Materials engineer, mechanical engineer, and physicist, Naval Air Warfare Center, Warminster, PA

    Granata, DM
    Materials engineer, mechanical engineer, and physicist, Naval Air Warfare Center, Warminster, PA

    Scott, WR
    Materials engineer, mechanical engineer, and physicist, Naval Air Warfare Center, Warminster, PA


    Paper ID: STP15354S

    Committee/Subcommittee: E08.09

    DOI: 10.1520/STP15354S


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