Practical formula of the shape evolution of a surface crack under fatigue loading

Yosuke Anai, Toshio Niwa, Koji Gotoh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

Fatigue life estimation for planar cracks, e.g. part-through surface cracks or embedded cracks is very important because most of fatigue cracks found in welded built-up structures show planar crack morphologies. Although authors had proposed the estimation procedure of crack shape evolution for a planar crack based on the fracture mechanics approach, this method cannot apply if the values of stress intensity factor at the vertices of the surface crack approximated as an ellipse cannot calculated. Then, development of the shape evolution procedure of a planer crack under the stress field with arbitrary gradient, because fatigue cracks in welded built-up structures exist near the stress concentrated region. A Practical estimation formula the shape evolution of a surface crack under stress field with the gradient is proposed in this study. This formula is established by considering the stress field under no crack condition and some former proposed formulae under uniform and pure bending stress fields. The validity of the proposed formula are confirmed by comparing some measured surface crack shape evolutions under some stress gradient conditions.

Original languageEnglish
Title of host publicationMaterials Technology
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791856505
DOIs
Publication statusPublished - 2015
EventASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2015 - St. John's, Canada
Duration: May 31 2015Jun 5 2015

Publication series

NameProceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE
Volume4

Other

OtherASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2015
CountryCanada
CitySt. John's
Period5/31/156/5/15

All Science Journal Classification (ASJC) codes

  • Ocean Engineering
  • Energy Engineering and Power Technology
  • Mechanical Engineering

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