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Effects of weld strength heterogeneity on crack driving force in stress and strain based design scenarios

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Abstract
Weld strength mismatch is a key factor with respect to the assessment of a flawed girth weld. However, it is challenging to assign a single strength mismatch value to girth welds, which are generally heterogeneous in terms of constitutive behavior. The authors have recently developed a method ('homogenization') to account for weld strength property variations in the estimation of crack driving force response and the corresponding tensile limit state. This paper separately validates the approach for stress based and strain based assessments. Whereas homogenization is reliably applicable for stress based assessments, the strain based crack driving force response is highly sensitive to effects of actual heterogeneous weld properties. The sensitivity increases with increased weld width and decreased strain hardening behavior. For strain based design, a more accurate methodology is desirable, and large scale testing and/or advanced numerical modeling remain essential.
Keywords
TENSION, GIRTH WELDS, MODEL, SPECIMENS, PLATES, TESTS, LOADS

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MLA
Hertelé, Stijn, et al. “Effects of Weld Strength Heterogeneity on Crack Driving Force in Stress and Strain Based Design Scenarios.” PROCEEDINGS OF THE 10TH INTERNATIONAL PIPELINE CONFERENCE - 2014, VOL 4, 2014.
APA
Hertelé, S., O’Dowd, N., Verstraete, M., Van Minnebruggen, K., & De Waele, W. (2014). Effects of weld strength heterogeneity on crack driving force in stress and strain based design scenarios. PROCEEDINGS OF THE 10TH INTERNATIONAL PIPELINE CONFERENCE - 2014, VOL 4. Presented at the 10th ASME International Pipeline Conference, Calgary, Alberta, Canada.
Chicago author-date
Hertelé, Stijn, Noel O’Dowd, Matthias Verstraete, Koen Van Minnebruggen, and Wim De Waele. 2014. “Effects of Weld Strength Heterogeneity on Crack Driving Force in Stress and Strain Based Design Scenarios.” In PROCEEDINGS OF THE 10TH INTERNATIONAL PIPELINE CONFERENCE - 2014, VOL 4.
Chicago author-date (all authors)
Hertelé, Stijn, Noel O’Dowd, Matthias Verstraete, Koen Van Minnebruggen, and Wim De Waele. 2014. “Effects of Weld Strength Heterogeneity on Crack Driving Force in Stress and Strain Based Design Scenarios.” In PROCEEDINGS OF THE 10TH INTERNATIONAL PIPELINE CONFERENCE - 2014, VOL 4.
Vancouver
1.
Hertelé S, O’Dowd N, Verstraete M, Van Minnebruggen K, De Waele W. Effects of weld strength heterogeneity on crack driving force in stress and strain based design scenarios. In: PROCEEDINGS OF THE 10TH INTERNATIONAL PIPELINE CONFERENCE - 2014, VOL 4. 2014.
IEEE
[1]
S. Hertelé, N. O’Dowd, M. Verstraete, K. Van Minnebruggen, and W. De Waele, “Effects of weld strength heterogeneity on crack driving force in stress and strain based design scenarios,” in PROCEEDINGS OF THE 10TH INTERNATIONAL PIPELINE CONFERENCE - 2014, VOL 4, Calgary, Alberta, Canada, 2014.
@inproceedings{5713523,
  abstract     = {{Weld strength mismatch is a key factor with respect to the assessment of a flawed girth weld. However, it is challenging to assign a single strength mismatch value to girth welds, which are generally heterogeneous in terms of constitutive behavior. The authors have recently developed a method ('homogenization') to account for weld strength property variations in the estimation of crack driving force response and the corresponding tensile limit state. This paper separately validates the approach for stress based and strain based assessments. Whereas homogenization is reliably applicable for stress based assessments, the strain based crack driving force response is highly sensitive to effects of actual heterogeneous weld properties. The sensitivity increases with increased weld width and decreased strain hardening behavior. For strain based design, a more accurate methodology is desirable, and large scale testing and/or advanced numerical modeling remain essential.}},
  articleno    = {{IPC2014-33454}},
  author       = {{Hertelé, Stijn and O'Dowd, Noel and Verstraete, Matthias and Van Minnebruggen, Koen and De Waele, Wim}},
  booktitle    = {{PROCEEDINGS OF THE 10TH INTERNATIONAL PIPELINE CONFERENCE - 2014, VOL 4}},
  isbn         = {{978-0-7918-4613-1}},
  keywords     = {{TENSION,GIRTH WELDS,MODEL,SPECIMENS,PLATES,TESTS,LOADS}},
  language     = {{eng}},
  location     = {{Calgary, Alberta, Canada}},
  pages        = {{9}},
  title        = {{Effects of weld strength heterogeneity on crack driving force in stress and strain based design scenarios}},
  year         = {{2014}},
}

Web of Science
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