Journal of the Society of Materials Science, Japan
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
Original Papers
Fracture Mechanics Approach to Small Fatigue Crack Growth and Coalescence under Low Cycle Fatigue
Shota HASUNUMATakeshi OGAWAMasanori KIKUCHI
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2011 Volume 60 Issue 12 Pages 1060-1065

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Abstract
Under low cycle fatigue condition, small cracks initiate on the specimen surface, and then they grow and coalesce with each other. The coalescence of small cracks is an important factor in evaluating fatigue life based on the fracture mechanics approach. However, surface observation of the coalescence is not sufficient in order to understand the mechanism and the influence on the fatigue life. Present study performed numerical simulations of the crack coalescence using the S-FEM based on the linear elastic fracture mechanics. The results revealed that the fatigue life was reduced when the main crack coalesces with a crack of comparative size, while the effect of fatigue life reduction was small when the main crack coalesces with a crack of less than half size. Experimental results were compared with the simulated results.
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© 2011 by The Society of Materials Science, Japan
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