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Abstract
The occurrence of a crack propagating along a pipeline is a catastrophic event, which involves both economic losses and environmental damage. Therefore, the study of the fracture initiation and propagation properties of a pipeline is an essential part of its integrity assessment. Fracture prediction, however, is a challenging task, since it requires knowledge of the interaction between the dynamic forces driving crack growth, and the resistance forces opposing fracture propagation. Moreover, plenty of material properties should be taken into account. Aiming at a better understanding of the plastic hardening, damage and fracture properties of an API X70 pipeline steel, and how these are affected by the strain rate, in present contribution, a comprehensive set of test results is presented. The influence of loading conditions is studied by performing static and dynamic experiments with different stress triaxialities: tensile tests on smooth and notched samples and compression tests on cylindrical samples. The static tensile tests are carried out on a conventional electromechanical test device. The high strain rate behaviour of API X70 pipeline steel is characterised using Split Hopkinson Bar (SHB) tensile setup. The material was found to combine high strength with relatively high ductility. Positive strain rate influence was observed in terms of strength and relative increase in deformation capacity primarily in the transition from static to dynamic rates of loading. Induced high stress triaxialities in the notched samples gave rise to higher initial axial force levels resulting in a detrimental effect on the strain capacity of the material. The stress and strain distributions close to the fracture, including the loading path up to the onset of fracture are analysed using finite element modelling. As such, the study aims at providing data needed for both fundamental material research and constitutive material modelling.
Keywords
crack propagation, damage and fracture, strain rate, Split-Hopkinson Bar, stress triaxiality, material modelling

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MLA
Chandran, Sarath et al. “Dynamic Fracture of a Pipeline Steel.” International Symposium on Nano and Micro Scale Damage in Metals. Ed. Leo Kestens, Jilt Sietsma, & Hadi Pirgazi. Vol. 1. Netherlands, 2018. 33. Print.
APA
Chandran, S., Verleysen, P., Lian, J., Liu, W., Cooreman, S., & Münstermann, S. (2018). Dynamic fracture of a pipeline steel. In L. Kestens, J. Sietsma, & H. Pirgazi (Eds.), International Symposium on Nano and Micro Scale Damage in Metals (Vol. 1, p. 33). Presented at the International Symposium on Nano and Micro Scale Damage in Metals, Netherlands.
Chicago author-date
Chandran, Sarath, Patricia Verleysen, Junhe Lian, Wenqi Liu, Steven Cooreman, and Sebastian Münstermann. 2018. “Dynamic Fracture of a Pipeline Steel.” In International Symposium on Nano and Micro Scale Damage in Metals, ed. Leo Kestens, Jilt Sietsma, and Hadi Pirgazi, 1:33. Netherlands.
Chicago author-date (all authors)
Chandran, Sarath, Patricia Verleysen, Junhe Lian, Wenqi Liu, Steven Cooreman, and Sebastian Münstermann. 2018. “Dynamic Fracture of a Pipeline Steel.” In International Symposium on Nano and Micro Scale Damage in Metals, ed. Leo Kestens, Jilt Sietsma, and Hadi Pirgazi, 1:33. Netherlands.
Vancouver
1.
Chandran S, Verleysen P, Lian J, Liu W, Cooreman S, Münstermann S. Dynamic fracture of a pipeline steel. In: Kestens L, Sietsma J, Pirgazi H, editors. International Symposium on Nano and Micro Scale Damage in Metals. Netherlands; 2018. p. 33.
IEEE
[1]
S. Chandran, P. Verleysen, J. Lian, W. Liu, S. Cooreman, and S. Münstermann, “Dynamic fracture of a pipeline steel,” in International Symposium on Nano and Micro Scale Damage in Metals, Utrecht, Netherlands, 2018, vol. 1, p. 33.
@inproceedings{8603506,
  abstract     = {The occurrence of a crack propagating along a pipeline is a catastrophic event, which involves both economic losses and environmental damage. Therefore, the study of the fracture initiation and propagation properties of a pipeline is an essential part of its integrity assessment. Fracture prediction, however, is a challenging task, since it requires knowledge of the interaction between the dynamic forces driving crack growth, and the resistance forces opposing fracture propagation. Moreover, plenty of material properties should be taken into account. Aiming at a better understanding of the plastic hardening, damage and fracture properties of an API X70 pipeline steel, and how these are affected by the strain rate, in present contribution, a comprehensive set of test results is presented. The influence of loading conditions is studied by performing static and dynamic experiments with different stress triaxialities: tensile tests on smooth and notched samples and compression tests on cylindrical samples. The static tensile tests are carried out on a conventional electromechanical test device. The high strain rate behaviour of API X70 pipeline steel is characterised using Split Hopkinson Bar (SHB) tensile setup. The material was found to combine high strength with relatively high ductility. Positive strain rate influence was observed in terms of strength and relative increase in deformation capacity primarily in the transition from static to dynamic rates of loading. Induced high stress triaxialities in the notched samples gave rise to higher initial axial force levels resulting in a detrimental effect on the strain capacity of the material. The stress and strain distributions close to the fracture, including the loading path up to the onset of fracture are analysed using finite element modelling. As such, the study aims at providing data needed for both fundamental material research and constitutive material modelling.},
  author       = {Chandran, Sarath and Verleysen, Patricia and Lian, Junhe  and Liu, Wenqi  and Cooreman, Steven  and Münstermann, Sebastian},
  booktitle    = {International Symposium on Nano and Micro Scale Damage in Metals},
  editor       = {Kestens, Leo and Sietsma, Jilt and Pirgazi, Hadi},
  keywords     = {crack propagation,damage and fracture,strain rate,Split-Hopkinson Bar,stress triaxiality,material modelling},
  language     = {eng},
  location     = {Utrecht, Netherlands},
  pages        = {1},
  title        = {Dynamic fracture of a pipeline steel},
  url          = {https://www.m2i.nl/nano-micro-scale-damage-metals-international-symposium/ ; https://www.4tu.nl/htm/en/4tu-htm-news/nano-micro-scale-damage-metals/ ; https://www.tudelft.nl/evenementen/2017/3me/symposium-on-nano-and-micro-scale-damage-in-metals/},
  volume       = {1},
  year         = {2018},
}