Study of the Effects of Metallurgical Factors on the Growth of Fatigue Microcracks.
Final rept. 1 Nov 80-31 Oct 83,
SOUTHWEST RESEARCH INST SAN ANTONIO TX
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The micromechanics of crack tip yielding are characterized for large and small fatigue cracks in aluminum alloys. Techniques used included selected area electron channeling and stereoimaging strain analysis. The anomalous fast growth of small fatigue cracks correlated with greater crack tip strains and displacements, and lower crack opening loads, for microcracks as compared with large cracks. Microcrack growth rate perturbations were modeled in terms of grain boundary induced reductions in crack tip strain. Author
- Properties of Metals and Alloys