New study of fatigue crack growth in pipes having a circumferential semi-elliptical crack prone to bending

Article type: Research Article

Authors: Amiri, M.^;

Affiliations: Research Institute of Petroleum Industry, Tehran, Iran

Note: [] Address for correspondence: M. Amiri, Research Institute of Petroleum Industry, West Blvd., Near Azadi Sports Complex, Tehran, 1485733111, Iran. Tel.: +9821 48253508; Fax: +9821 44739713; E-mail: amirimm@ripi.ir

Abstract: A peripheral crack in a steel rounded pipe beneath periodic bending loading is studied in this paper. The analysis of the fatigue crack growth is done in accordance with Paris law. The growth of fatigue crack is also analyzed with various initial crack “α” beneath periodic loading. The weight of the Paris exponent on fatigue crack propagation is presented as well. Furthermore, the “fatigue crack growth” progression of several specimens is evaluated experimentally by an invented setup. Conclusively, the experimentally achieved results are compared with the numerical results. This comparison demonstrates good compliance with the theoretical results.

Keywords: K (stress intensity factor), fatigue crack growth, semi-elliptical crack, thick-wall pipes

DOI: 10.3233/SFC-2012-0149

Journal: Strength, Fracture and Complexity, vol. 7, no. 4, pp. 341-352, 2012