Journal
COMPUTATIONAL MATERIALS SCIENCE
Volume 46, Issue 1, Pages 115-123Publisher
ELSEVIER
DOI: 10.1016/j.commatsci.2009.02.012
Keywords
Fatigue; Crack growth modeling; Critical damage model; Strain-life method; Hutchinson-Rice-Rosengren field; Crack growth algorithm
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Models are proposed to predict the fatigue crack growth (FCG) process using crack initiation properties and critical damage concepts. The crack is modeled as a sharp notch with a very small but finite tip radius to remove its singularity, using a strain concentration rule. In this way, the damage caused by each load cycle and the effects of residual stresses can be calculated at each element ahead of the crack tip using the hysteresis loops caused by the loading, without the need for adjustable parameters. A computational algorithm is introduced to calculate cycle-by-cycle crack growth using the proposed methodology. A quite good agreement between the epsilon N-based crack growth predictions and experiments is obtained both for constant and for variable amplitude load histories. (C) 2009 Elsevier B.V. All rights reserved.
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