The design of welded structures for the fatigue limit state is normally carried out by means of either linear or bilinear S-N curves, which have been found adequate to predict crack initiation only. To properly assess the effects of the design, fabrication, inspection, and repair strategy for structure degradation due to crack growth, fracture mechanics (FM) models need to be applied. In this paper, alternative S-N and FM formulations of fatigue are investigated. The probabilistic fracture mechanics approach predicts the fatigue life of welded steel structures in the presence of cracks under random spectrum loading. It is based on a recently proposed bi-linear relationship to model fatigue crack growth. Uncertainty modeling, especially on fatigue crack growth parameters, is undertaken with the aid of recently published data in support of the bilinear crack growth relationship. Results pertaining to the fatigue reliability and fatigue crack size evolution are presented using the Monte Carlo simulation technique and the emphasis is placed on a comparison between the linear and bilinear crack growth models. Variations in the system configuration, service life, and coefficients of crack growth laws have been studied on the parametric basis
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May 2014
Research-Article
Bi-Linear Fatigue and Fracture Approach for Safety Analysis of an Offshore Structure
Rizwan A. Khan,
Rizwan A. Khan
1
Assistant Professor
National Institute of Technology,
e-mail: rizwan_iitd@yahoo.co.in
Department of Civil Engineering
,National Institute of Technology,
Jalandhar, Punjab 144011
, India
e-mail: rizwan_iitd@yahoo.co.in
1Corresponding author.
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Suhail Ahmad
Suhail Ahmad
Professor
Indian Institute of Technology,
Department of Applied Mechanics
,Indian Institute of Technology,
Delhi, New Delhi 110016
, India
Search for other works by this author on:
Rizwan A. Khan
Assistant Professor
National Institute of Technology,
e-mail: rizwan_iitd@yahoo.co.in
Department of Civil Engineering
,National Institute of Technology,
Jalandhar, Punjab 144011
, India
e-mail: rizwan_iitd@yahoo.co.in
Suhail Ahmad
Professor
Indian Institute of Technology,
Department of Applied Mechanics
,Indian Institute of Technology,
Delhi, New Delhi 110016
, India
1Corresponding author.
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received March 26, 2012; final manuscript received January 30, 2014; published online March 18, 2014. Assoc. Editor: Bernt J. Leira.
J. Offshore Mech. Arct. Eng. May 2014, 136(2): 021602 (7 pages)
Published Online: March 18, 2014
Article history
Received:
March 26, 2012
Revision Received:
January 30, 2014
Citation
Khan, R. A., and Ahmad, S. (March 18, 2014). "Bi-Linear Fatigue and Fracture Approach for Safety Analysis of an Offshore Structure." ASME. J. Offshore Mech. Arct. Eng. May 2014; 136(2): 021602. https://doi.org/10.1115/1.4026669
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