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Weld strength mismatch in strain based flaw assessment: which definition to use?

Stijn Hertelé UGent, Wim De Waele UGent, Rudi Denys UGent, Matthias Verstraete UGent, Koen Van Minnebruggen UGent and Anthony Horn (2012) Pressure Vessels & Piping Conference, Proceedings. 6. p.857-866
abstract
Weld strength mismatch is a key factor in the strain based assessment of flawed girth welds under tension. A strength overmatching weld shields potential flaws within the weld itself from remotely applied deformations and consequently reduces crack driving force. Although this effect has been recognized for decades, different weld strength overmatch definitions exist and it is not yet fully established which of those is most relevant to a strain based flaw assessment. In an effort to clarify this unsolved question, the authors have performed a large series of parametric finite element analyses of curved wide plate tests. This paper provides an experimental validation of the model and subsequently discusses representative results. It is found that crack driving force is influenced by the shape of the pipe metals' stress-strain curves, which influences the representativeness of two common mismatch definitions (based on yield strength and on ultimate tensile strength). It can be concluded from further observations that effects of strength mismatch on strain capacity of a flawed girth weld are best described on the basis of a flow stress, defined as the average of yield and ultimate tensile strength. Based on the observations, a framework for a new strain capacity equation is proposed.
Please use this url to cite or link to this publication:
author
organization
year
type
conference
publication status
published
subject
keyword
GIRTH WELDS, PLASTIC YIELD LOADS, CRACKS, PIPELINES, DESIGN
in
Pressure Vessels & Piping Conference, Proceedings
volume
6
pages
857 - 866
publisher
ASME International
conference name
ASME 2012 Pressure Vessels and Piping Conference (PVP - 2012)
conference location
Toronto, Canada
conference start
2012-07-15
conference end
2012-07-19
Web of Science type
Proceedings Paper
Web of Science id
000323916100107
ISBN
9780791855058
language
English
UGent publication?
yes
classification
P1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2963639
handle
http://hdl.handle.net/1854/LU-2963639
date created
2012-07-19 23:12:26
date last changed
2013-11-26 15:36:40
@inproceedings{2963639,
  abstract     = {Weld strength mismatch is a key factor in the strain based assessment of flawed girth welds under tension. A strength overmatching weld shields potential flaws within the weld itself from remotely applied deformations and consequently reduces crack driving force. Although this effect has been recognized for decades, different weld strength overmatch definitions exist and it is not yet fully established which of those is most relevant to a strain based flaw assessment. In an effort to clarify this unsolved question, the authors have performed a large series of parametric finite element analyses of curved wide plate tests. This paper provides an experimental validation of the model and subsequently discusses representative results. It is found that crack driving force is influenced by the shape of the pipe metals' stress-strain curves, which influences the representativeness of two common mismatch definitions (based on yield strength and on ultimate tensile strength). It can be concluded from further observations that effects of strength mismatch on strain capacity of a flawed girth weld are best described on the basis of a flow stress, defined as the average of yield and ultimate tensile strength. Based on the observations, a framework for a new strain capacity equation is proposed.},
  author       = {Hertel{\'e}, Stijn and De Waele, Wim and Denys, Rudi and Verstraete, Matthias and Van Minnebruggen, Koen and Horn, Anthony},
  booktitle    = {Pressure Vessels \& Piping Conference, Proceedings},
  isbn         = {9780791855058},
  keyword      = {GIRTH WELDS,PLASTIC YIELD LOADS,CRACKS,PIPELINES,DESIGN},
  language     = {eng},
  location     = {Toronto, Canada},
  pages        = {857--866},
  publisher    = {ASME International},
  title        = {Weld strength mismatch in strain based flaw assessment: which definition to use?},
  volume       = {6},
  year         = {2012},
}

Chicago
Hertelé, Stijn, Wim De Waele, Rudi Denys, Matthias Verstraete, Koen Van Minnebruggen, and Anthony Horn. 2012. “Weld Strength Mismatch in Strain Based Flaw Assessment: Which Definition to Use?” In Pressure Vessels & Piping Conference, Proceedings, 6:857–866. ASME International.
APA
Hertelé, S., De Waele, W., Denys, R., Verstraete, M., Van Minnebruggen, K., & Horn, A. (2012). Weld strength mismatch in strain based flaw assessment: which definition to use? Pressure Vessels & Piping Conference, Proceedings (Vol. 6, pp. 857–866). Presented at the ASME 2012 Pressure Vessels and Piping Conference (PVP - 2012), ASME International.
Vancouver
1.
Hertelé S, De Waele W, Denys R, Verstraete M, Van Minnebruggen K, Horn A. Weld strength mismatch in strain based flaw assessment: which definition to use? Pressure Vessels & Piping Conference, Proceedings. ASME International; 2012. p. 857–66.
MLA
Hertelé, Stijn, Wim De Waele, Rudi Denys, et al. “Weld Strength Mismatch in Strain Based Flaw Assessment: Which Definition to Use?” Pressure Vessels & Piping Conference, Proceedings. Vol. 6. ASME International, 2012. 857–866. Print.