A key influence factor in the strain-based assessment of pipeline girth weld flaws is weld strength mismatch. Recent research has led to a framework for tensile strain capacity as a function of weld flow stress (FS) overmatch. This framework is built around three parameters: the strain capacity of an evenmatching weldment, the sensitivity of strain capacity to weld FS overmatch, and the strain capacity at gross section collapse (GSC). A parametric finite element study of curved wide plate (CWP) tests has been performed to identify the influence of various characteristics on each of these three parameters. This paper focuses on flaw depth, tearing resistance of the weld, stress–strain behavior of the base metal, and weld geometry. Influences of these characteristics are mostly found to be limited to one or two of the three framework parameters. A preliminary structure is proposed for equations that further develop the strain capacity framework.

Issue Section:
Materials and Fabrication
Keywords:
girth weld, strain based assessment, strain capacity, strength mismatch, flow stress
Topics:
Base metals, Dimensions, Geometry, Metals, Stress, Welded joints, Fracture (Materials)

References

1.
Fairchild
,
D. P.
,
Macia
,
M. L.
,
Kibey
,
S.
,
Wang
,
X.
,
Krishnan
,
V. R.
,
Bardi
,
F.
,
Tang
,
H.
, and
Cheng
,
W.
,
2011
, “
A Multi-Tiered Procedure for Engineering Critical Assessment of Strain-Based Pipelines
,”
The 21st International Offshore and Polar Engineering Conference
,
Maui, HI
, pp.
698
–
705
.
2.
Østby
,
E.
,
2005
, “
Fracture Control—Offshore Pipelines: New Strain-Based Fracture Mechanics Equations Including the Effects of Biaxial Loading, Mismatch and Misalignment
,”
ASME
Paper No. OMAE2005-67518.10.1115/OMAE2005-67518
3.
Denys
,
R. M.
,
Hertelé
,
S.
,
Verstraete
,
M.
, and
De Waele
,
W.
,
2013
, “
Strain Capacity Prediction for Strain-Based Pipeline Designs
,”
International Seminar on Welding of High Strength Pipeline Steels, Companhia Brasileira de Metalurgia e Mineração (CBMM)
,
Araxá, Brazil
, pp.
315
–
332
.
4.
Liu
,
M.
,
Wang
,
Y.-Y.
,
Song
,
Y.
,
Horsley
,
D.
, and
Nanney
,
S.
,
2012
, “
Multi-Tier Tensile Strain Models for Strain-Based Design, Part 2—Development and Formulation of Tensile Strain Capacity Models
,”
ASME
Paper No. IPC2012-90659.10.1115/IPC2012-90659
5.
Hertelé
,
S.
,
De Waele
,
W.
,
Denys
,
R.
,
Verstraete
,
M.
,
Van Minnebruggen
,
K.
, and
Horn
,
A.
,
2013
, “
Weld Strength Mismatch in Strain Based Flaw Assessment: Which Definition to Use?
,”
ASME J. Press. Vess. Technol.
,
135
(
6
), p.
061402
.10.1115/1.4025343
Google Scholar
Crossref
Search ADS
 
6.
Denys
,
R.
,
De Waele
,
W.
,
Lefevre
,
A.
, and
De Baets
,
P.
,
2004
, “
An Engineering Approach to the Prediction of the Tolerable Defect Size for Strain-Based Design
,”
4th International Conference on Pipeline Technology
,
Ostend, Belgium
, Vol.
1
, pp.
163
–
182
.
7.
Hertelé
,
S.
,
Verstraete
,
M.
,
Van Minnebruggen
,
K.
,
Denys
,
R.
, and
De Waele
,
W.
,
2012
, “
Curved Wide Plate Testing With Advanced Instrumentation and Interpretation
,”
ASME
Paper No. IPC2012-90591.10.1115/IPC2012-90591
8.
Macia
,
M. L.
,
Kibey
,
S. A.
,
Arslan
,
H.
,
Bardi
,
F.
,
Ford
,
S. J.
,
Kan
,
W. C.
,
Cook
,
M. F.
, and
Newbury
,
B.
,
2010
, “
Approaches to Quality Strain-Based Designed Pipelines
,”
ASME
Paper No. IPC2010-31662.10.1115/IPC2010-31662
9.
Hertelé
,
S.
,
O'Dowd
,
N. P.
,
Denys
,
R.
,
Van Minnebruggen
,
K.
, and
De Waele
,
W.
,
2014
, “
Effects of Pipe Steel Heterogeneity on the Tensile Strain Capacity of a Flawed Pipeline Girth Weld
,”
Eng. Fract. Mech.
,
115
, pp.
172
–
189
.10.1016/j.engfracmech.2013.11.003
Google Scholar
Crossref
Search ADS
 
10.
Hertelé
,
S.
,
De Waele
,
W.
,
Denys
,
R.
,
Verstraete
,
M.
, and
Van Wittenberghe
,
J.
,
2012
, “
Parametric Finite Element Model for Large Scale Tension Tests on Flawed Pipeline Girth Welds
,”
Adv. Eng. Software
,
47
(
1
), pp.
24
–
34
.10.1016/j.advengsoft.2011.12.007
Google Scholar
Crossref
Search ADS
 
11.
Denys
,
R.
, and
Lefevre
,
A.
,
2009
, “
UGent Guidelines for Curved Wide Plate Testing
,”
The 5th Pipeline Technical Conference
,
Ostend, Belgium
.
12.
Rice
,
J. R.
,
1968
, “
A Path Independent Integral and the Approximate Analysis of Strain Concentration by Notches and Cracks
,”
ASME J. Appl. Mech.
,
35
(
2
), pp.
379
–
386
.10.1115/1.3601206
Google Scholar
Crossref
Search ADS
 
13.
Brickstad
,
B.
, and
Sattari-Far
,
I.
,
2000
, “
Crack Shape Developments for LBB Applications
,”
Eng. Fract. Mech.
,
67
(
6
), pp.
625
–
646
.10.1016/S0013-7944(00)00077-1
Google Scholar
Crossref
Search ADS
 
14.
Anderson
,
T. L.
,
1995
,
Fracture Mechanics—Fundamentals and Applications
, 2nd ed.,
CRC Press LLC
,
Boca Raton, FL
, p.
683
.
15.
Østby
,
E.
,
Thaulow
,
C.
, and
Nyhus
,
B.
,
2007
, “
A New Approach to Ductile Tearing Assessment of Pipelines under Large-Scale Yielding
,”
Int. J. Press. Vessels Pip.
,
84
(
6
), pp.
337
–
348
.10.1016/j.ijpvp.2007.02.002
Google Scholar
Crossref
Search ADS
 
16.
Hertelé
,
S.
,
De Waele
,
W.
, and
Denys
,
R.
,
2011
, “
A Generic Stress–Strain Model for Metallic Materials With Two-Stage Strain Hardening Behaviour
,”
Int. J. Non Linear Mech.
,
46
(
3
), pp.
519
–
531
.10.1016/j.ijnonlinmec.2010.12.004
Google Scholar
Crossref
Search ADS
 
17.
Hertelé
,
S.
,
De Waele
,
W.
,
Denys
,
R.
, and
Verstraete
,
M.
,
2012
, “
Full-Range Stress–Strain Behaviour of Contemporary Pipeline Steels: Part I. Model Description
,”
Int. J. Press. Vessels Pip.
,
92
, pp.
34
–
40
.10.1016/j.ijpvp.2012.01.006
Google Scholar
Crossref
Search ADS
 
18.
Ramberg
,
W.
, and
Osgood
,
W. R.
,
1943
, “
Description of Stress–Strain Curves by Three Parameters
,”
National Advisory Committee for Aeronautics
, Technical Note No. 902.
19.
Hertelé
,
S.
,
De Waele
,
W.
,
Denys
,
R.
, and
Verstraete
,
M.
,
2012
, “
Full-Range Stress–Strain Behaviour of Contemporary Pipeline Steels: Part II. Estimation of Model Parameters
,”
Int. J. Press. Vessels Pip.
,
92
, pp.
27
–
33
.10.1016/j.ijpvp.2012.01.007
Google Scholar
Crossref
Search ADS
 
20.
Denys
,
R.
,
Hertelé
,
S.
, and
Verstraete
,
M.
,
2010
, “
Strain Capacity of Weak and Strong Girth Welds in Axially Loaded Pipelines
,”
International Pipeline Technology Conference
,
Beijing, China
.
21.
Kibey
,
S.
,
Wang
,
X.
,
Minnaar
,
K.
,
Macia
,
M. L.
,
Fairchild
,
D. P.
,
Kan
,
W. C.
,
Ford
,
S. J.
, and
Newbury
,
B.
,
2010
, “
Tensile Strain Capacity Equations for Strain-Based Design of Welded Pipelines
,”
ASME
Paper No. IPC2010-31661.10.1115/IPC2010-31661
22.
Østby
,
E.
, and
Hellesvik
,
A. O.
,
2008
, “
Large-Scale Experimental Investigation of the Effect of Biaxial Loading on the Deformation Capacity of Pipes With Defects
,”
Int. J. Press. Vessels Pip.
,
85
(
11
), pp.
814
–
824
.
Google Scholar
Crossref
Search ADS
 
23.
Kibey
,
S. A.
,
Minnaar
,
K.
,
Issa
,
J. A.
, and
Gioielli
,
P. C.
,
2008
, “
Effect of Misalignment on the Tensile Strain Capacity of Welded Pipelines
,”
18th International Offshore and Polar Engineering Conference
,
Vancouver, BC, Canada
, pp.
90
–
95
.
24.
Hertelé
,
S.
,
De Waele
,
W.
,
Verstraete
,
M.
,
Denys
,
R.
, and
O'Dowd
,
N.
,
2014
, “
J-Integral Analysis of Heterogeneous Mismatched Girth Welds in Clamped Single-Edge Notched Tension Specimens
,”
Int. J. Press. Vessels Pip.
,
119
, pp.
95
–
107
.10.1016/j.ijpvp.2014.03.006
Google Scholar
Crossref
Search ADS
 
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