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Effect of mixed mode loading induced by asymmetrical stress upon crack initiation from corrosion pits

*Corresponding author for this work
Research Output:
Chapter in Book/Report/Conference proceeding
Conference contribution
 Peer-review

Open access

Publication Information

Output type

Research Output:
Chapter in Book/Report/Conference proceeding
Conference contribution
 Peer-review

Original language

English

Pages from-to (Number of pages)

Pages 39-46 (8 pages)

Publication milestones

  • Published - 01/01/2009

Publication status

Published - 01/01/2009

Publisher

Trans Tech Publications

Publication series

  • Publication series name: Advanced Materials Research
    ISSN (Print): 1022-6680
    Volume: 65

ISBN (Print)

9780878493302

Publication IDs

  • Scopus: 70349266089

Host publication title

17th International Materials Research Congress; from the 17th International Materials Research Congress, Symposium 11, Fracture Mechanics

Abstract

This work focuses on determining the influence of mixed stress conditions on the initiation of fatigue cracks from corrosion pits in a UNS S3 1603 stainless steel. Fatigue limit was established as a threshold stress criteria for fatigue crack initiation from semi-elliptic surface pits. The strain energy release rate range (ΔG) around semi-elliptic surface pits was determined as a function of the pit aspect ratio (depth/major width axes: a/c), pit contour and the orientation of the nominal stress from a linear elastic fracture mechanics approach. Results indicated that stress conditions for crack initiation in mixed mode overcome the minimum stress level or single threshold stress established from the fatigue limit concept. Under mixed mode condition a crack will grow at the surface zone (φ = 0°) when a/c≥0.60 and for orientation angles from 5 to 75°.

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