STP601

    Application of Fracture Mechanics to the Thermostructural Failure of Graphite

    Published: Jan 1976


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    Abstract

    Thermostructural failure of materials used in reentry vehicles is an important problem. This paper is an experimental and analytical study of a testing facility in which these materials are thermostructurally evaluated. Radio frequency energy is used to induce a steep, radial temperature gradient in a disk-shaped specimen. A KI solution for this specimen is developed by a semiempirical procedure; it is used to analyze the experimental data. Experiments were performed on ATJ-S (WS) graphite. Comparison of the results from the KI solution are compared to contemporary KI values for this graphite. Currently, the KI solution is inadequate for design purposes; however, it shows the potential of providing a better understanding of the thermostructural fracture process.

    Keywords:

    crack propagation, fracture tests, thermostructural failure, graphite, K, I, solution


    Author Information:

    Starrett, HS
    Head and research engineer, Analytical Mechanics Section, Southern Research Institute, Birmingham, Ala.

    Cull, AD
    Head and research engineer, Analytical Mechanics Section, Southern Research Institute, Birmingham, Ala.

    Irwin, GR
    Visiting professor, University of Maryland, College Park, Md.


    Paper ID: STP28639S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP28639S


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