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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.
fatigue (materials), fractures (materials), ductile, brittle fracturing, face centered cubic tattices, lattices, fractography, crack propagation, evaluation, tests
Nair, K. D.
graduate studentPersonal member ASTM, University of Saskatchewan, Saskatoon, Sask.
Le May, I.
Associate professor, University of Saskatchewan, Saskatoon, Sask.