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Fatigue Crack Retardation by Concurrent Cold-Expansion and Ring-indentation
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 Title & Authors
Fatigue Crack Retardation by Concurrent Cold-Expansion and Ring-indentation
Yu, Jin-Sang;
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 Abstract
A more efficient method for obtaining the fatigue life enhancement of a structure member with fastener holes is described. It is based on the combined process of cold-expansion and ring-indentation. Residual stresses were induced onto premachined holes using ring-indentation process near the fastener hole combined with cold-expansion. And residual stresses at the vicinity of a hole were evaluated using a fracture mechanics approach. The compressive residual stresses were larger using the combined process than is in the case of simple cold-expansion. Fatigue testing of aluminum specimens showed that the fatigue crack growth retardation emanating from a circular hole was greater for the combined process than for a simple cold-expansion alone.
 Keywords
Fastener Hole;Cold-Expansion;Ring-Indentation;Residual Stress;Stress Intensity Factor;Fatigue Crack Retardation;Weight Function;
 Language
Korean
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