TY - GEN
T1 - Effects of weld strength heterogeneity on crack driving force in stress and strain based design scenarios
AU - Hertelé, Stijn
AU - O'Dowd, Noel
AU - Verstraete, Matthias
AU - Van Minnebruggen, Koen
AU - De Waele, Wim
N1 - Publisher Copyright:
Copyright © 2014 by ASME.
PY - 2014
Y1 - 2014
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84917710613&partnerID=8YFLogxK
U2 - 10.1115/IPC2014-33454
DO - 10.1115/IPC2014-33454
M3 - Conference contribution
AN - SCOPUS:84917710613
T3 - Proceedings of the Biennial International Pipeline Conference, IPC
BT - Production Pipelines and Flowlines; Project Management; Facilities Integrity Management; Operations and Maintenance; Pipelining in Northern and Offshore Environments; Strain-Based Design; Standards and Regulations
PB - American Society of Mechanical Engineers (ASME)
T2 - 2014 10th International Pipeline Conference, IPC 2014
Y2 - 29 September 2014 through 3 October 2014
ER -