Predicting fatigue crack growth under irregular loading
The authors describe a model for predicting fatigue crack growth (FCG) with the presence in the loading spectrum of peak and block tensile overloads. The model is based on account for the following factors influencing crack growth retardation: change of the quantity K{sub op} as a consequence of the induction of a system of residual compressive stresses at the crack tip and increase of the degree of crack closure that is due to plastic deformation of the material in the {open_quotes}wake{close_quotes} of the tip of the growing crack; plastic blunting of the crack tip. They propose a technique for quantitative prediction of the residual crack tip opening (radius of the blunted tip) after a peak tensile overload. Experimental verification of the proposed FCG model with differing applied load irregularity showed that the model may serve as the basis of a method for predicting the service life of cracked members operating in irregular loading regimes.
- OSTI ID:
- 376978
- Journal Information:
- Strength of Materials, Journal Name: Strength of Materials Journal Issue: 8 Vol. 26; ISSN 0039-2316; ISSN SMTLB5
- Country of Publication:
- United States
- Language:
- English
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