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Calibrating a ductile damage model for two pipeline steels : method and challenges

Robin Depraetere (UGent) , Margo Cauwels (UGent) , Wim De Waele (UGent) , Tom Depover (UGent) , Kim Verbeken (UGent) and Stijn Hertelé (UGent)
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Abstract
This work is part of a project that aims to develop a micromechanics based damage law taking into account hydrogen assisted degradation. A 'vintage' API 5L X56N and a 'modern' API 5L X70M pipeline steel have been selected for this purpose. The paper focuses on an experimental calibration of ductile damage properties of the well known complete Gurson model for the two steels in absence of hydrogen. A basic microstructural characterization is provided, showing a banded ferrite-pearlite microstructure for both steels. Charpy impact tests showed splits at the fracture surface for the X70 steel. Double-notched round bar tensile tests are performed, aiming to provide the appropriate input for damage model calibration. The double-notched nature of the specimens allows to examine the material state at maximum load in the unfailed notch, and the final material state in the failed notch. Different notch radii are used, capturing a broad range of positive stress triaxialities. The notches are optically monitored for transverse necking in two perpendicular directions (transverse to rolling and through thickness) to reveal any anisotropy in plastic deformation and/or damage. It is explained how the occurrence of splits at the segregation zone, and anisotropy complicate the calibration procedure. Calibration is done for each steel and acceptable results are obtained. However, the occurrence of splits did not allow to evaluate the damage model for the highest levels of tested stress triaxiality.
Keywords
Complete Gurson model, Pipeline steel, Notched round bar, Splits, Anisotropy

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MLA
Depraetere, Robin, et al. “Calibrating a Ductile Damage Model for Two Pipeline Steels : Method and Challenges.” 1st Virtual European Conference On Fracture - VECF1, edited by F Lacoviello et al., vol. 28, Elsevier, 2020, pp. 2267–76, doi:10.1016/j.prostr.2020.11.072.
APA
Depraetere, R., Cauwels, M., De Waele, W., Depover, T., Verbeken, K., & Hertelé, S. (2020). Calibrating a ductile damage model for two pipeline steels : method and challenges. In F. Lacoviello, A. Sedmak, L. Marsavina, B. Blackman, G. Ferro, V. Shlyannikov, … L. BanksSills (Eds.), 1st Virtual European Conference On Fracture - VECF1 (Vol. 28, pp. 2267–2276). https://doi.org/10.1016/j.prostr.2020.11.072
Chicago author-date
Depraetere, Robin, Margo Cauwels, Wim De Waele, Tom Depover, Kim Verbeken, and Stijn Hertelé. 2020. “Calibrating a Ductile Damage Model for Two Pipeline Steels : Method and Challenges.” In 1st Virtual European Conference On Fracture - VECF1, edited by F Lacoviello, A Sedmak, L Marsavina, B Blackman, GA Ferro, V Shlyannikov, P Stahle, et al., 28:2267–76. Elsevier. https://doi.org/10.1016/j.prostr.2020.11.072.
Chicago author-date (all authors)
Depraetere, Robin, Margo Cauwels, Wim De Waele, Tom Depover, Kim Verbeken, and Stijn Hertelé. 2020. “Calibrating a Ductile Damage Model for Two Pipeline Steels : Method and Challenges.” In 1st Virtual European Conference On Fracture - VECF1, ed by. F Lacoviello, A Sedmak, L Marsavina, B Blackman, GA Ferro, V Shlyannikov, P Stahle, Z Zhang, PMGP Moreira, Z Bozic, and L BanksSills, 28:2267–2276. Elsevier. doi:10.1016/j.prostr.2020.11.072.
Vancouver
1.
Depraetere R, Cauwels M, De Waele W, Depover T, Verbeken K, Hertelé S. Calibrating a ductile damage model for two pipeline steels : method and challenges. In: Lacoviello F, Sedmak A, Marsavina L, Blackman B, Ferro G, Shlyannikov V, et al., editors. 1st Virtual European Conference On Fracture - VECF1. Elsevier; 2020. p. 2267–76.
IEEE
[1]
R. Depraetere, M. Cauwels, W. De Waele, T. Depover, K. Verbeken, and S. Hertelé, “Calibrating a ductile damage model for two pipeline steels : method and challenges,” in 1st Virtual European Conference On Fracture - VECF1, Online, 2020, vol. 28, pp. 2267–2276.
@inproceedings{8683466,
  abstract     = {{This work is part of a project that aims to develop a micromechanics based damage law taking into account hydrogen assisted degradation. A 'vintage' API 5L X56N and a 'modern' API 5L X70M pipeline steel have been selected for this purpose. The paper focuses on an experimental calibration of ductile damage properties of the well known complete Gurson model for the two steels in absence of hydrogen. A basic microstructural characterization is provided, showing a banded ferrite-pearlite microstructure for both steels. Charpy impact tests showed splits at the fracture surface for the X70 steel. Double-notched round bar tensile tests are performed, aiming to provide the appropriate input for damage model calibration. The double-notched nature of the specimens allows to examine the material state at maximum load in the unfailed notch, and the final material state in the failed notch. Different notch radii are used, capturing a broad range of positive stress triaxialities. The notches are optically monitored for transverse necking in two perpendicular directions (transverse to rolling and through thickness) to reveal any anisotropy in plastic deformation and/or damage. It is explained how the occurrence of splits at the segregation zone, and anisotropy complicate the calibration procedure. Calibration is done for each steel and acceptable results are obtained. However, the occurrence of splits did not allow to evaluate the damage model for the highest levels of tested stress triaxiality.}},
  author       = {{Depraetere, Robin and Cauwels, Margo and De Waele, Wim and Depover, Tom and Verbeken, Kim and Hertelé, Stijn}},
  booktitle    = {{1st Virtual European Conference On Fracture - VECF1}},
  editor       = {{Lacoviello, F and Sedmak, A and Marsavina, L and Blackman, B and Ferro, GA and Shlyannikov, V and Stahle, P and Zhang, Z and Moreira, PMGP and Bozic, Z and BanksSills, L}},
  issn         = {{2452-3216}},
  keywords     = {{Complete Gurson model,Pipeline steel,Notched round bar,Splits,Anisotropy}},
  language     = {{eng}},
  location     = {{Online}},
  pages        = {{2267--2276}},
  publisher    = {{Elsevier}},
  title        = {{Calibrating a ductile damage model for two pipeline steels : method and challenges}},
  url          = {{http://dx.doi.org/10.1016/j.prostr.2020.11.072}},
  volume       = {{28}},
  year         = {{2020}},
}

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