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    Examination of the Correlation Between NDE-Detected Manufacturing Abnormalities in MMCs and Ultimate Tensile Strength or Thermomechanical Fatigue Life

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    Titanium matrix composites containing manufacturing abnormalities were examined using ultrasonic and X-ray nondestructive evaluation techniques. The [0/90]s and [0/90]2s SCS-6/β21-S specimens were subjected to 650°C tension or thermomechanical fatigue tests to assess any degradation in strength or fatigue life due to the abnormalities. The usefulness of ultrasonic nondestructive evaluation to assess the integrity of the composites containing manufacturing abnormalities was shown through the correlation of the ultrasonic data with ultimate tensile strength and thermomechanical fatigue life. Additionally, the use of X-ray radiographic nondestructive evaluation appears to complement the ultrasonic data and is useful for analyzing fiber displacement, orientation, and nonparallelism. A simple damage parameter was developed to help quantify the ultrasonic NDE data from manufacturing abnormalities within the material. The test results on the specimens containing manufacturing abnormalities are presented with analysis of the degree of correlation between the NDE results and tensile strength and/or thermomechanical fatigue life.


    metal matrix composites, nondestructive evaluation, ultrasonics, X-ray, thermomechanical fatigue, manufacturing defects

    Author Information:

    Stubbs, DA
    University of Dayton, Dayton, OH

    Russ, SM
    Wright Laboratories/Materials Directorate, Wright-Patterson AFB, OH

    MacLellan, PT
    University of Dayton, Dayton, OH

    Committee/Subcommittee: E08.09

    DOI: 10.1520/STP18133S