STP1157

    Nondestructive Evaluation of a Ceramic Matrix Composite Material

    Published: Jan 1992


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    Abstract

    Monolithic ceramic materials have proven their usefulness in many applications, yet, their potential for critical structural applications is limited because of their sensitivity to small imperfections. To overcome this extreme sensitivity to small imperfections, ceramic matrix composite materials have been developed that have the ability to withstand some distributed damage. A borosilicate glass reinforced with several layers of silicon-carbide fiber mat has been studied. Four-point flexure and tension tests were performed not only to determine some of the material properties, but also to initiate a controlled amount of damage within each specimen. Acousto-ultrasonic (AU) measurements were performed periodically during mechanical testing. This paper will compare the AU results to the mechanical test results and data from other nondestructive methods including acoustic emission monitoring and X-ray radiography. It was found that the AU measurements were sensitive to the damage that had developed within the material.

    Keywords:

    composite materials, ceramic matrix composite materials, nondestructive evaluation, acousto-ultrasonics, advanced materials, fatigue (materials)


    Author Information:

    Grosskopf, PP
    Graduate student and professor, Virginia Polytechnic Institute and State UniversityMichelin Americas R&D Corporation, BlacksburgGreenville, VASC

    Duke, JC
    Graduate student and professor, Virginia Polytechnic Institute and State UniversityMichelin Americas R&D Corporation, BlacksburgGreenville, VASC


    Paper ID: STP15353S

    Committee/Subcommittee: E08.09

    DOI: 10.1520/STP15353S


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