Techniques for Multiaxial Creep Testing pp 209-221 | Cite as
Computer Modelling of Creep Damage in Components with Variable Metallurgical Structure
Abstract
Inhomogeneities in stress distribution in structural components usually arise from changes in section. However, stress concentrations can occur in components of uniform section if there are differences in mechanical properties from point to point in the body. Differences in elastic moduli can give inhomogeneous stresses although, since variations in elastic constants with metallurgical structure are not large, such effects are generally small. When creep deformation can occur, the situation is different. A geometric stress concentration will often be dissipated by creep if sufficient ductility is available but those stress concentrations due to material properties can be intensified. Metallurgical structures can have creep properties which are so different that as creep loads are added to the external loadings in service, stress intensification can occur where restraints are imposed due to relatively slow deformation rates. Thus metallurgical notches can develop and may lead to premature failure.
Keywords
Effective Stress Heat Affected Zone Maximum Principal Stress Weld Interface Rupture LifePreview
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References
- Alberry, P. J. and Jones, W. K. C. (1979) A computer model for the prediction of heat affected zone microstructures in multipass weldments. Report R/M/R282, Central Electricity Generating Board.Google Scholar
- Almond, E. A., Brown, D. K., daVies, G. J. and Cottenden, A. M. (1983) Theoretical and experimental interlayed butt joints tested in tension. Int. J. Mech. Sci., 25, 175–89.CrossRefGoogle Scholar
- Bagnall, B. I., Rowley, T. and Williams, J. A. (1979) Welding and Fabrication in the Nuclear Industry, British Nuclear Energy Society, London.Google Scholar
- Chilton, I. J., Price, A. T. and Wilshire, B. (1984) Creep deformation and local strain distributions in dissimilar metal welds between AISI type 316 and 225CrlMo steels made with 17Cr8Ni2Mo weld metal. Metals Technology, 11, 383–91.Google Scholar
- Hayhurst, D. R. (1972) Creep rupture under multi-axial states of stress. J. Mech. Phys. Solids, 20, 381–90.CrossRefGoogle Scholar
- Hayhurst, D. R. (1983) On the role of creep continuum damage in structural mechanics. Engineering Approaches to High Temperature Design, B. Wilshire and D. R. J. Owen (Eds), Pineridge Press, Swansea, p. 85.Google Scholar
- Johnson, A. E. and Henderson, J. (1962) Complex Stress Creep, Relaxation and Fracture of Metallic Alloys, HMSO, Edinburgh.Google Scholar
- Long, S. S. and Ellis, F. V. (1978) Properties of Steel Weldments for Elevated Temperature Containment Applications, ASME, San Francisco.Google Scholar
- Nicholson, R. D. (1982) Creep rupture properties of austenitic and nickel-based transition joints. Metals Technology, 9, 305–11.Google Scholar