Prediction of fatigue crack initiation under biaxial loading

This investigation revisits biaxial fatigue experiments carried out with the nickel-based superalloy termed Waspaloy. Recently, yield criteria extended to multiaxial fatigue and stress based approaches were analysed and their performance to correlate the biaxial test data was evaluated. It was concl...

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Bibliographic Details
Published in:Frattura ed integritá strutturale 2017-07, Vol.11 (41), p.106-113
Main Authors: Sahadi, J.V., Nowell, D., Paynter, R.J.H.
Format: Article
Language:English
Subjects:
Alloys
Axial stress
Biaxial fatigue
Biaxial loads
Biaxial tests
Correlation analysis
Crack initiation
Crack propagation
Critical Plane Approach
Fatigue
Fatigue failure
Fatigue Life
Fracture mechanics
Load
Metal fatigue
Nickel
Nickel base alloys
Scattering
Strain
Superalloys
Waspaloy
Yield criteria
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Summary:This investigation revisits biaxial fatigue experiments carried out with the nickel-based superalloy termed Waspaloy. Recently, yield criteria extended to multiaxial fatigue and stress based approaches were analysed and their performance to correlate the biaxial test data was evaluated. It was concluded that despite their reliable results, the parameters did not properly represent the physical behaviour of the material. In this context, an extension of this study was executed considering the strain based critical plane approaches proposed by Fatemi-Socie (FS) and Smith- Watson-Topper (SWT). The first parameter presented overly conservative predictions with large scatter of results. In contrast, more accurate predictions were obtained with the SWT parameter.
ISSN:1971-8993
1971-8993
DOI:10.3221/IGF-ESIS.41.15