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    STP453

    Use of Electron Microfractography in Interpreting the Mechanisms of Fatigue Crack Propagation

    Published: 0


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    Abstract

    Electron microfractography has been used in elucidating the mechanisms of fatigue crack propagation in two face-centered-cubic (fcc) sheet metals which had been treated to produce different preferred orientations or textures. Comparison of the striations on the fatigue fracture surfaces of cold-rolled material with those of the same material, annealed to give a different texture and a high ductility, showed the morphology of the striations to be dependent on ductility and texture. A qualitative mechanism is suggested for fatigue crack growth by the Stage II process, involving the formation of striations.

    Keywords:

    fatigue (materials), fractures (materials), ductile, brittle fracturing, face centered cubic tattices, lattices, fractography, crack propagation, evaluation, tests


    Author Information:

    Nair, K. D.
    graduate studentPersonal member ASTM, University of Saskatchewan, Saskatoon, Sask.

    Le May, I.
    Associate professor, University of Saskatchewan, Saskatoon, Sask.


    Committee/Subcommittee: E08.03

    DOI: 10.1520/STP47359S