SEDL / STP / STP453-EB / STP47359S

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

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

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

Pages: 13    Published: Jan 1969

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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.