Fatigue Analysis of Crack Growing Rate and Stress Intensity Factor for Stress Corrosion Cracking in a Pipeline System
Environment-assisted cracking (EAC) is one of the most serious causes of structural failure over a broad range of industrial applications including offshore structures. In EAC condition there is not a definite relation such as Paris equation in Linear Elastic Fracture Mechanics (LEFM). According to studying and searching a lot what the researchers said either a material has contact with hydrogen or any other corrosive environment, phenomenon of electrical and chemical reactions of material with its environment will be happened. In the literature, there are many different works to consider fatigue crack growing and solve it but they are experimental works. Thus, in this paper, authors have an aim to evaluate mathematically the pervious works in LEFM. Obviously, if an environment is more sour and corrosive, the changes of stress intensity factor is more and the calculation of stress intensity factor is difficult. A mathematical relation to deal with the stress intensity factor during the diffusion of sour environment especially hydrogen in a marine pipeline is presented. By using this relation having and some experimental relation an analytical formulation will be presented which enables the fatigue crack growth and critical crack length under cyclic loading to be predicted. In addition, we can calculate KSCC and stress intensity factor in the pipeline caused by EAC.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1328102Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 2005
 R. N. Ibrahim, R. Rihan, R.K. Singh Raman, Validity of a new fracture mechanics technique for the determination of the threshold stress intensity factor for stress corrosion cracking and crack growth rate, Engineering fracture mechanics, Vol. 75, No.6, 2008, pp. 1623-1634.
 S. Ritter, H. P. Seifert, Effect of corrosion potential on the corrosion fatigue crack growth behavior of low-alloy steels in high-temperature water, Journal of Nuclear Materials, Vol. 375, No.1, 2008, pp. 72-79.
 Y. Bai, Pipelines and Risers, Elsevier Ocean Engineering Book Series, Vol. 3, New York; 2003.
 A. Turnbull, D. H. Ferriss, H. Anzai, Modeling of hydrogen distribution at a crack tip, Materials Science and Engineering, Vol. 206, No.1, 1996, pp. 1-13.
 U. Krupp, Fatigue crack propagation in metals and alloys: microstructure aspects and modelling concepts" WILEY-VCH Verlag GmbH & Co. KGaA, Germany; 2007.
 R. O. Ritchie, V. Schroeder, C. J. Gilbert, Fracture, fatigue and environmentally-assisted failure of a Zr-based bulk amorphous metal, Intermetallics, Vol. 8, , No. 5-6, 2000, pp. 469-475.
 X. Wu, Y. Katada, Cyclic cracking behavior of low-alloy pressure vessel teel in simulated BWR water, Journal of Nuclear Materials, Vol. 328, No. 2-3, 2004, pp. 115-123.
 Z. Sterjovski, D. G. Carr, D. P. Dunne, S. Ambrose, effect of PWHT cycles on fatigue crack growth and toughness of quenched and tempered pressure vessel steels, Material Science and Engineering, Vol. 391, No.1-2, 2005, pp.256-263.
 Y. Kim, Y. J. Chao, M. J. Pechersky, M. J. Morgan, On the effect of hydrogen on fracture toughness of steel, International Journal of Fracture, Vol. 134, No. 3-4, 2005, pp. 339-347.
 J. M. Smith, H. C. V. Ness, Introduction to chemical engineering thermodynamics, McGraw-Hill Inc., Fourth Edition, New York; 1916.