A series of well-known tubular joints tested in UKSORP II have been re-evaluated using the mesh-insensitive structural stress method as a part of the on-going Battelle Structural Stress JIP efforts. In this report, the structural stress based analysis procedure is first presented for applications in tubular joints varying from simple T joints, double T Joints, YT joints with overlap, and K joints with various internal stiffening configurations. The structural stress based SCFs are then compared with those obtained using traditional surface extrapolation based hot spot stress methods. Their abilities in effectively correlating the fatigue data collected from these tubular joints are demonstrated. These tests are also compared with the T curve typically used for fatigue design of tubular joints as well as the structural stress based master S-N curve adopted by ASME Section VIII Div 2. Finally, some of the implications on fracture mechanics based remaining life assessment for tubular joints are discussed in light of the results obtained in this investigation.

References

References
1.
UK HSE Offshore Technology Report: “
Stress Concentration Factors for Simple Tubular Joints: Assessment of Existing and Development of New Parametric Formulae
,” 1997.
2.
United Kingdom Offshore Research Project – Phase II (UKOSRP II) Summary Report, HMSO, OTH-87-265-1987.
3.
API RP 2A-WSD: API Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms—Working Stress Design,
21st ed.
, December 2005.
4.
DNV Recommended Practice DNV-RP-C203: “
Fatigue Design of Offshore Steel Structures
,” August 2005.
5.
ABS Guide for the Fatigue Assessment of Offshore Structures, April 2003.
6.
Stacey
,
A.
, and
Sharp
,
J. V.
, 1997, “
Fatigue Damage in Offshore Structures—Causes, Detection and Repair
,”
The 8th International Conference on the Behavior of Offshore Structures
.
7.
Connolly
,
M. P.
,
Hellier
,
A. K.
,
Dover
,
W. D.
, and
Sutomo
,
J.
, 1990, “
A Parametric Study of the Ratio of Bending to Membrane Stress in Tubular Y- and T-Joints
,”
Int. J. Fatigue
,
12
, pp.
3
11
.
8.
Chang
,
E.
, and
Dover
,
W. D.
, 1999, “
Prediction of Degree of Bending in Tubular X and DT-Joints
,”
International Journal of Fatigue
,
28
(
5–6
), pp.
147
161
.
9.
Chang
,
E.
, and
Dover
,
W. D.
, 2001, “
Characteristic Parameters for Stress Distribution Along the Interaction of Tubular Y, T, X and DT Joints
,”
J. Strain Anal.
,
36
(
3
), pp.
323
339
.
10.
Murthy
,
A. R. C.
,
Palani
,
G. S.
, and
Iyer
,
N. R.
, 2005, “
Fracture-Mechanics-Based Analytical Prediction of Remaining Life of Tubular T- and Y-Joints
,”
Proceedings of IMechE Part M: J. Engineering for the Maritime Environment
, March 1, 2005, Vol.
219
, pp.
1
10
.
11.
Dong
,
P.
, 2005, “
A Robust Structural Stress Method for Fatigue Analysis of Offshore/ Marine Structures
,”
ASME J. Offshore Mech. Arct. Eng.
,
127
, pp.
68
74
.
12.
2007 ASME Boiler & Pressure Vessel Code VIII Div 2– An International Code
,
The American Society of Mechanical Engineers
,
New York
.
13.
2007 API 579-1/ASME FFS-1
,
American Petroleum Institute
,
Houston, Texas
.
14.
Zerbst
,
U.
, and
Miyata
,
T.
, 2002, “
The Fracture Behavior of a Welded Tubular Joint—An ESIS TC1.3 Round Robin on Failure Assessment Methods. Part VI: Application of WES 2805-1997
,”
Eng. Fract. Mech.
,
69
, pp.
1161
1169
.
15.
Dong
,
P.
,
Hong
,
J. K.
, and
Cao
,
Z.
, 2003, “
Stresses and Stress Intensities at Notches: ‘Anomalous Crack Growth’ Revisited
,”
Int. J. Fatigue
,
25
, pp.
811
825
.
16.
Dong
,
P.
,
Prager
,
M.
, and
Osage
,
D.
, 2007, “
The Design Master S-N Curve in ASME Div 2 Rewrite and Its Validations
,”
International Journal of International Institute of Welding (IIW): Welding in the World
,
51
(
5/6
), pp.
53
63
.
17.
UK DOE United Kingdom Offshore Steel Research Project – Phase II (UKOSRP II) Summary Report, HMSO, OTH-87-265, 1987.
18.
Efthymiou
,
M.
, 1988, “
Development of SCF Formulae and Generalised Influence Functions for Use in Fatigue Analysis
,” Recent Developments in Tubular Joint Technology, OTJ’88, London.
19.
Dong
,
P.
, and
Hong
,
J. K.
, 2006, “
A Robust Structural Stress Parameter for Evaluation of Multiaxial Fatigue of Weldments
,”
J. ASTM Int.
,
3
(
7
).
20.
Dong
,
P.
,
Hong
,
J. K.
, and
De Jesus
,
M.
, 2007, “
Analysis of Recent Vessel Fatigue Data Using Structural Stress Procedure Proposed For Div 2 Rewrite
,”
ASME J. Pressure Vessel Technol.
,
29
(
3
), pp.
355
362
.
You do not currently have access to this content.