Some pipelines face global plastic straining due to the nature of their installation process or harsh environmental conditions during operation. The ability of the girth welds to withstand these plastic strains is often evaluated on the basis of wide plate tests. Key for the validity of these tests is a representative measurement of remote strain, mostly obtained by linear variable differential transformers and/or strain gauges. The outcome of the remote strain measurement depends on the specimen geometry and the position of these sensors. In an attempt to investigate a specific geometric design of wide plate specimens and to find appropriate remote strain sensor positions, the authors have performed a series of tension tests on medium-sized wide plate specimens, supported by digital image correlation strain measurements. In addition, finite element simulations have been performed to evaluate whether the experimental observations can be extrapolated to a wider range of conditions. The results indicate that the strain distribution is mostly influenced by the weld strength mismatch, which governs the lateral restraint. For all experiments and simulations, nevertheless, the strain field was highly uniform in an identified zone, resulting in simple guidelines regarding specimen geometry and sensor positioning.
ØstbyEThaulowCNyhusB. A new approach to ductile tearing assessment of pipelines under large-scale yielding. Int J Press Vessels Pip2007; 84(6): 337–348.
2.
KibeySWangXMinnaarK. Tensile strain capacity equations for strain-based design of welded pipelines. In: Proceedings of the 8th ASME international pipeline conference, Calgary, Alberta, Canada, 27 September–1 October 2010, paper IPC2010-31661.
3.
RoopWP. Notes on the conditions of brittle rupture of ship plates of medium steel. TMB Report R-276, US Navy, Washington DC, 1944.
4.
CraveroSBravoREErnstHA. Constraint evaluation and effect on J-R resistance curves for pipes under combined load conditions. In: Proceedings of the 18th ISOPE international offshore and polar engineering conference, Vancouver, Canada, 6–11 July 2008, pp.149–156.
5.
CraveroSBravoREErnstHA. Fracture evaluation of cracked pipelines subjected to combined loading. In: Proceedings of the 5th international conference on pipeline technology, Ostend, Belgium, 12–14 October 2009.
6.
WangYYLiuMWeeksT. Broad perspectives of girth weld tensile strain response. In: Proceedings of the 8th ASME international pipeline conference, Calgary, Alberta, Canada, 27 September–1 October 2010, paper IPC2010-31369.
7.
De KeyserKVan AckerFHerteléS. Validation of a wide plate finite element model using digital image correlation. Sustain Constr Des2011; 2: 416–423.
8.
HelmJDSuttonMAMcNeillSR. Deformations in wide, center-notched, thin panels, part I: three-dimensional shape and deformation measurements by computer vision. Opt Eng2003; 42(5): 1293–1305.
9.
HelmJDSuttonMAMcNeillSR. Deformations in wide, center-notched, thin panels, part II: finite element analysis and comparison to experimental measurements. Opt Eng2003; 42(5): 1306–1320.
10.
WangYYLiuMChenY. Effects of geometry, temperature, and test procedure on reported failure strains from simulated wide plate tests. In: Proceedings of the 6th ASME international pipeline conference, Calgary, Alberta, Canada, 25–29 September 2006, paper IPC2006-10497.
11.
FairchildDPChengWFordSJ. Recent advances in curved wide plate testing and implications for strain-based design. Int J Offshore Polar Eng2008; 18(3): 161–170.
12.
HerteléSDe WaeleWDenysR. Investigation of pipe strain measurements in a curved wide plate specimen. In: Proceedings of the 8th ASME international pipeline conference, Calgary, Alberta, Canada, 27 September–1 October 2010, paper IPC2010-31292.
13.
ASTME 740-03(2010). Standard practice for fracture testing with surface-crack tension specimens. ASTM International, West Conshohocken, USA, 2010.
14.
MinamiFOhataMToyodaM. The effect of weld metal yield strength on the fracture behaviour of girth welds in grade 550 pipe. In: Proceedings of pipeline technology, Ostend, Belgium, 11–14 September 1995, 1, pp.441–461.
15.
MinamiFTakashimaYOhataM. Constraint-based assessment of CTOD toughness requirement for high-strain line pipe. Int J Offshore Polar Eng2011; 21(2): 129–140.
16.
MotarjemiA. Strain-based engineering critical assessment (ECA) of partially mismatched girth welds. In: Proceedings of the 5th international conference on pipeline technology, Ostend, Belgium, 12–14 October 2009.
17.
IshikawaREndoSIgiS. Ductile fracture behaviour of girth-welded joints and strain-based design for high-strength pipeline. In: Proceedings of the 4th international conference on pipeline technology, Ostend, Belgium, 9–13 May 2004, 1, pp.81–98.
18.
IgiSSuzukiN. Tensile strain limits of X80 high-strain pipelines. In: Proceedings of the 17th ISOPE international offshore and polar engineering conference, Lisbon, Portugal, 1–6 July 2007, pp.3081–3087.
19.
DenysR. Wide plate testing of weldments, Part II – Wide-plate evaluation of notch toughness. In: ASTM STP 1058 – fatigue and fracture testing of weldments, 1990, pp.157–228.
20.
IgiSSakimotoTSuzukiN. Tensile strain capacity of X80 under tensile loading with internal pressure. In: Proceedings of the 8th ASME international pipeline conference, Calgary, Alberta, Canada, 27 September–1 October 2010, paper IPC2010-31281.
21.
IgiSSadasueTKuboT. Effect of crack geometry and tensile properties on tensile strain limit of X80 linepipe. In: Proceedings of the 18th ISOPE international offshore and polar engineering conference, Vancouver, BC, Canada, 6–11 July 2008, pp.79–85.
22.
DenysRLefevreA. UGent guidelines for curved wide plate testing. In: Proceedings of the 5th international conference on pipeline technology, Ostend, Belgium, 12–14 October 2009.
23.
RichardsMWeeksTMcColskeyD. Fatigue precracking curved wide plates in bending. In: Proceedings of the 8th ASME international pipeline conference, Calgary, Alberta, Canada, 27 September–1 October 2010, paper IPC2010-31468.
24.
StephensMJRandyTPetersenRT. An experimental basis for improved strain-based design models. In: Proceedings of the 19th ISOPE international offshore and polar engineering conference, Osaka, Japan, 21–26 June 2009, pp.29–35.
25.
StephensMPetersenRWangYY. Large scale experimental data for improved strain-based design models. In: Proceedings of the 8th ASME international pipeline conference, Calgary, Alberta, Canada, 27 September–1 October 2010, paper IPC2010-31396.
26.
BannisterACOcejoJRGutierrez-SolanaF. Implications of the yield stress/tensile stress ratio to the SINTAP failure assessment diagrams for homogeneous materials. Eng Fract Mech2000; 67(6): 547–562.
27.
DallamCHuysmansSDenysR. Design criteria for X80 pipe welding: process and strength effects on weld performance in wide plate tests. In: Proceedings of the 5th international conference on pipeline technology, Ostend, Belgium, 12–14 October 2009.
28.
SuttonMAOrteuJJSchreierHW. Image correlation for shape, motion and deformation measurements. Basic concepts, theory and application. Springer, 2009.
29.
Limess Messtechnik Software GmbH, www.limess.com (accessed 20 February 2012).
HerteléSDe WaeleWDenysR. Parametric finite element model for large scale tension tests on flawed pipeline girth welds. Adv Eng Software2012; 47(1): 24–34.
32.
ØstbyE. Fracture control – offshore pipelines – new strain-based fracture mechanics equations including the effects of biaxial loading, mismatch and misalignment. In: Proceedings of the 24th ASME international conference on offshore mechanics and arctic engineering, Halkidiki, Greece, 12–17 June 2005, paper OMAE2005-67518.
33.
RambergWOsgoodWR. Description of stress–strain curves by three parameters. National Advisory Committee for Aeronautics, Technical note No. 902, 1943.
34.
HerteléSDe WaeleWDenysR. A generic stress–strain model for metallic materials with two-stage strain hardening behaviour. Int J Non-Lin Mech2011; 46(3): 519–531.
35.
HerteléSDe WaeleWDenysR. Full-range stress–strain behaviour of contemporary pipeline steels: Part I. Model description. Int J Press Vessels Pip2012; 92: 34–40.
36.
BeisselSBelytschkoT. On patterns of deformation in phase transformations and Lüders bands. Int J Solids Struct1996; 33(12): 1689–1707.
37.
KyriakidesSMillerJE. On the propagation of Lüders bands in steel strips. J Appl Mech Trans ASME2000; 67(4): 645–654.
