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Evaluation of ductile tearing for API-5L X70 pipeline grade steel using sent specimens

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Abstract
Pipelines in harsh environments may be subjected to large deformations. Classic stress-based design needs to be complemented with strain-based design. An important parameter in the design is the crack growth resistance. SENT testing (Single Edge Notch Tension) allows to determine the so-called material’s tearing resistance curve. Very recently the first standard on SENT testing, BS 8571:2014, has been published. SENT testing is however still subject to extensive research and different approaches with respect to e.g. notch placement, crack extension measurement and analysis exist. In this paper two methods for calculating crack extension based on the unloading compliance procedure are used and compared, proving that they show little difference. This is performed on an API-5L X70 steel grade and this for different configurations, namely an inner diameter notch and a through thickness notch. The results showed little difference between the different configurations, although the inner diameter showed higher crack growth resistance. Furthermore, the results are compared to visual observations of the fracture surfaces and a hardness map. The fracture surfaces corresponded to the obtained resistance curves. However, no real correlation between the hardness map and the other results could be seen.
Keywords
SENT, Unloading Compliance, Resistance Curves, Crack Growth, CTOD

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Please use this url to cite or link to this publication:

Chicago
Ohms, Nicholas, Diego Belato Rosado, and Wim De Waele. 2015. “Evaluation of Ductile Tearing for API-5L X70 Pipeline Grade Steel Using Sent Specimens.” Ed. Stijn Hertelé and Jeroen Van Wittenberghe. Sustainable Construction and Design 6 (3).
APA
Ohms, N., Belato Rosado, D., & De Waele, W. (2015). Evaluation of ductile tearing for API-5L X70 pipeline grade steel using sent specimens. (S. Hertelé & J. Van Wittenberghe, Eds.)SUSTAINABLE CONSTRUCTION AND DESIGN, 6(3).
Vancouver
1.
Ohms N, Belato Rosado D, De Waele W. Evaluation of ductile tearing for API-5L X70 pipeline grade steel using sent specimens. Hertelé S, Van Wittenberghe J, editors. SUSTAINABLE CONSTRUCTION AND DESIGN. Ghent, Belgium: Ghent University, Laboratory Soete; 2015;6(3).
MLA
Ohms, Nicholas, Diego Belato Rosado, and Wim De Waele. “Evaluation of Ductile Tearing for API-5L X70 Pipeline Grade Steel Using Sent Specimens.” Ed. Stijn Hertelé & Jeroen Van Wittenberghe. SUSTAINABLE CONSTRUCTION AND DESIGN 6.3 (2015): n. pag. Print.
@article{6865011,
  abstract     = {Pipelines in harsh environments may be subjected to large deformations. Classic stress-based design needs to be complemented with strain-based design. An important parameter in the design is the crack growth resistance. SENT testing (Single Edge Notch Tension) allows to determine the so-called material{\textquoteright}s tearing resistance curve. Very recently the first standard on SENT testing, BS 8571:2014, has been published. SENT testing is however still subject to extensive research and different approaches with respect to e.g. notch placement, crack extension measurement and analysis exist. In this paper two methods for calculating crack extension based on the unloading compliance procedure are used and compared, proving that they show little difference. This is performed on an API-5L X70 steel grade and this for different configurations, namely an inner diameter notch and a through thickness notch. The results showed little difference between the different configurations, although the inner diameter showed higher crack growth resistance. Furthermore, the results are compared to visual observations of the fracture surfaces and a hardness map. The fracture surfaces corresponded to the obtained resistance curves. However, no real correlation between the hardness map and the other results could be seen.},
  author       = {Ohms, Nicholas and Belato Rosado, Diego and De Waele, Wim},
  editor       = {Hertel{\'e}, Stijn and Van Wittenberghe, Jeroen},
  issn         = {2032-7471},
  journal      = {SUSTAINABLE CONSTRUCTION AND DESIGN},
  language     = {eng},
  number       = {3},
  pages        = {8},
  publisher    = {Ghent University, Laboratory Soete},
  title        = {Evaluation of ductile tearing for API-5L X70 pipeline grade steel using sent specimens},
  url          = {http://dx.doi.org/10.13140/RG.2.1.3610.7361},
  volume       = {6},
  year         = {2015},
}

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