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TECHNICAL PAPERS

Creep Modeling of Welded Joints Using the Theta Projection Concept and Finite Element Analysis

[+] Author and Article Information
M. Law, W. Payten, K. Snowden

Australian Nuclear Science and Technology Organisation (ANSTO), Materials, Building 3, PMB1, Menai, NSW 2234, Australia

J. Pressure Vessel Technol 122(1), 22-26 (Oct 11, 1999) (5 pages) doi:10.1115/1.556141 History: Received May 21, 1998; Revised October 11, 1999
Copyright © 2000 by ASME
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References

Williams, I., Coleman, M., and Walters, D., 1984, “Weld Performance Factors for High Temperature Welded Components,” Proceedings, 2nd International Conference on Creep and Fracture of Engineering Materials and Structures, Part II, pp. 873–887.
Williams,  J., 1982, “A Simplified Approach to the Effect of Specimen Size on the Creep Rupture of Cross Weld Samples,” ASME J. Eng. Mater. Technol., 104, Jan., pp. 36–40.
Hyde,  T., and Sun,  W., 1997, “Stress Singularities at the Free Surface of an Axisymmetric Two-Material Creep Test Specimen,” J. Strain Anal., 32, No. 2, pp. 107–117.
Sandstrom,  R., and Tu,  S., 1994, “The Effect of Multiaxiality on the Evaluation of Weldment Strength Reduction Factors in High Temperature Creep,” ASME J. Pressure Vessel Technol., 116, pp. 76–80.
Tu, S., Segle, P., and Samuelson, L., 1993, “Some Aspects of the Design of Welded Structures Subjected to High Temperature Creep,” High Temperature Service and Time Dependent Failure, ASME PVP 262 , 27–34.
Vazda,  D., 1997, “On Concentration Effects in Circumferential Welds due to Dissimilar Creep Properties,” Int. J. Pressure Vessels & Piping, 73, pp. 119–126.
Kussmaul, K., Maile, K., and Eckert, W., 1993, “Influence of Stress State and Specimen Size on Creep Rupture of Similar and Dissimilar Welds,” Constraint Effects in Fracture, ASTM STP 1171, eds. E. Hackett, K. Schwalbe, R. Dodds, pp. 341–360.
Bhaduri,  A., Gaudig,  W., Theofel,  H., and Maile,  K., 1996, “Finite Element Modelling of the Creep deformation of T91 Steel Weldments at 600°C,” Steel Res., 67, No. 5, pp. 215–220.
Hall,  F., and Hayhurst,  D., 1991, “Continuum Damage Mechanics Modelling of High Temperature Deformation and Failure in a Pipe Weldment,” Proc. R. Soc. London, Ser. A, 433, pp. 383–403.
Colombo,  P., Garzillo,  A., , 1996, “Creep and Damage Analysis of a Serviced Tee Intersection in a Boiler Header: Comparison Between Numerical and Experimental Results,” Int. J. Pressure Vessels Piping, 66, pp. 243–251.
Parker,  J., 1985, “Prediction of Creep Deformation and Failure for 1/2Cr-1/4V and 2-1/4Cr-1Mo Steels,” ASME J. Pressure Vessel Technol., 107, pp. 279–284.
Viswanathan, R., 1989, “Damage Mechanisms and Life Assessment of High Temperature Components,” ASM International, USA, p. 61.
Snowden, K. and Merhtens, E., 1990, “Analysis of Creep Data for Remaining Life Estimation,” Proceedings, Remaining Life Assessment on High Temperature Plant in Australia, Lucas Heights.
Evans, R., Beden, I., and Wilshire, B., 1984, “Creep Life Prediction for 12 Cr 12 Mo 14 V Ferritic Steel,” Creep and Fracture of Engineering Materials and Structures, Pineridge Press, Swansea, UK, pp. 1277–1290.
Evans, R., Parker, I., and Wilshire, B., 1982, “An Extrapolative Procedure for Long Term Creep-Strain and Creep Life Prediction,” Recent Advances in Creep and Fracture of Engineering Materials and Structures, Pineridge Press, Swansea, UK, pp. 135–184.
Ripley, M. and Snowden, K., 1994, “Remaining Creep Life Assessment of Welds in Steel Pressure Vessels,” Proceedings, Structural Integrity: Experiments, Models and Applications. 10th Biennial Conference on Fracture, Berlin, Germany, 1 , pp. 761–766.
Tu,  S., Wu,  R., and Sandstrom,  R., 1994, “Design Against Creep Failure for Weldments in 0.5 Cr 0.5 Mo 0.25 V Pipe,” Int. J. Pressure Vessels Piping, 58, pp. 345–354.
Law,  M., and Payten,  W., 1997, “Weld Performance under Creep Using Finite Element Modelling,” Int. J. Pressure Vessels & Piping, 72, pp. 45–49.

Figures

Grahic Jump Location
First principal stress in cylindrical pressure vessel during Norton stress redistribution
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Von Mises stress in cylindrical pressure vessel during Norton stress redistribution
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First principal stress in cylindrical pressure vessel using theta creep model
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Von Mises stress in cylindrical pressure vessel using theta creep model
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Von Mises stress and predicted creep rate at inner wall, long-term response
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Section through girth weld
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Boundary conditions in FEA model
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Creep response of materials at 5.8 ksi, 1214°F (40 MPa, 930 K)
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Norton (left) and theta (right) models with 0.5 σh axial loading; first principal stresses
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Norton (left) and theta (right) models with 0.5 σh axial loading; von Mises stresses

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