Abstract
The purpose of this research is to investigate the interaction of two adjacent cracks under cyclic loading. A series of tests at different loads and frequencies were conducted under uniaxial constant amplitude fatigue loads on API-5L grade B steel samples. Crack growth rate of two initial semi-elliptical cracks was investigated. Marker band testing technique was employed to study the crack growth rate before and after interaction. Real time optical microscopy was used to observe crack coalescence on the specimens’ surface. Moreover, SEM analysis of the fracture surface was performed for comprehensive understanding of cracks behavior.
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NTSB (2002) Rupture of enbridge pipeline and release of crude oil near Cohasset. NTSB/PAR-04/01, Washington, DC
Bayley C (1997) Parametric investigation on the coalescence of coplanar fatigue cracks. Masters’ thesis, Carleton University, Ottawa
Harrington D (1995) Fatigue crack coalescence and shape development and experimental investigation. Masters Thesis, Carleton University, Department of Mechanical and Aerospace Engineering
Leek T, Howard I (1994) Rules for the assessment of interacting surface cracks under mode I load. Int J Press Vessel Pip 60:323–339
Leek T, Howard I (1996) An examination of methods of assessing interacting surface cracks by comparison with experimental data. Int J Press Vessel Pip 68:181–201
Leek T (1990) The interaction and growth of two surface cracks under fatigue loading. PhD Thesis, University of Sheffield, UK
Soboyejo W, Knott J (1990) Fatigue crack propagation of coplanar semi-elliptical cracks in pure bending. Eng Fract Mech 37(2):323–340
Kishimoto K, Soboyejo W, Smith R, Knott J (1989) A numerical investigation of the interaction and coalescence of twin coplanar semi elliptical fatigue cracks. Int J Fatigue 11(2):91–96
Twaddle J, Hancock B (1988) The development of cracks by defect coalescence. Engineering Materials Advisory Service, Warrington, pp 185–198
O’Donoghure T, Nishioka P, Atluris N (1984) Multiple surface cracks in pressure vessels. Eng Fract Mech 20(3):545–560
DeBartolo E, Hillberry B (1998) Effects of constituent particle clusters on fatigue behavior of 2024-T3 aluminum alloy. Int J Fatigue 20: 727–735
Terrell J (1988) Effect of cyclic frequency on the fatigue life of ASME SA-106-B piping steel in BWR environments. J Mater Eng 10:193–203
Willard SA (1997) Use of marker bands for determination of fatigue crack growth rates and crack front shapes in pre-corroded coupons. NASA, Hampton, VA
Ritchie R (1999) Mechanisms of fatigue-crack propagation in ductile and brittle solids. Int J Fract 100:55–83
Acknowledgments
The authors would like to thank Abu Dhabi National Oil Company (ADNOC), Abu Dhabi Company for Onshore Oil Operations (ADCO) and the Petroleum Institute (PI). Also, we would like to thank Dr. Mehdi Amiri for his efforts and support.
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© 2015 The Society for Experimental Mechanics, Inc.
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Al Tamimi, A., Modarres, M. (2015). Coalescence and Growth of Two Semi-Elliptical Coplanar Cracks in API-5L Grade B Steel. In: Carroll, J., Daly, S. (eds) Fracture, Fatigue, Failure, and Damage Evolution, Volume 5. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-06977-7_8
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DOI: https://doi.org/10.1007/978-3-319-06977-7_8
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