The creep behavior of simple structures with a stress range-dependent constitutive model
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High temperature design remains an issue for many components in a variety of industries. Although finite element analysis for creep is now an accessible tool, most analyses outside the research domain use long standing and very simple constitutive models—in particular based on a power law representation. However, for many years, it has been known that a range of materials exhibit different behaviors at low and moderate stress levels. Recently, studies of the behavior of high temperature structures with such a stress range-dependent constitutive model have begun to emerge. The aim of this paper is to examine further the detailed behavior of simple structures with a modified power law constitutive model in order to instigate a deeper understanding of such a constitutive model’s effect on stress and deformation and the implications for high temperature design. The structures examined are elementary—a beam in bending and a pressurized thick cylinder—but have long been used to demonstrate the basic characteristics of nonlinear creep.
KeywordsCreep Stress range-dependent constitutive model Structural analysis High temperature design
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- 1.Boyle J.T., Spence J.: Stress Analysis for Creep. Butterworths, London (1983)Google Scholar
- 3.Kraus H.: Creep Analysis. Wiley, New York (1980)Google Scholar
- 5.Frost H.J., Ashby M.F.: Deformation-Mechanism Maps. Pergamon, Oxford (1982)Google Scholar
- 9.Reith, M. et al.: Creep of the Austenitic Steel AISI 316 L(N). Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft, Wissenschaftliche Berichte FZKA 7065 (2004)Google Scholar
- 10.Evans, R.W., Parker, J.D., Wilshire, B.: In: Wilshire B., Owen, D.R.J. (eds.) Recent Advances in Creep and Fracture of Engineering Materials and Structures, pp. 135–184 (1982)Google Scholar
- 11.Garofalo F.: An empirical relation defining the stress dependence of minimum creep rate in metals. Trans. Metall. Soc. AIME 227, 351–356 (1963)Google Scholar
- 14.Boyle, J.T.: Stress relaxation and elastic follow-up using a stress range dependent constitutive model (Submitted)Google Scholar
- 16.Anderson, R.G.: Some observations on reference stresses, skeletal points, limit loads and finite elements. In: Creep in Structures, 3rd IUTAM Symposium, Leicester, pp. 166–178 (1981)Google Scholar
- 17.Boyle J.T., Seshadri, R.: The reference stress method in creep design: a thirty year retrospective. General lecture. In: Murakami, S., Ohno, N. (eds.) Proceedings of IUTAM Symposium on Creep in Structures, Nagoya, Kluwer, Dordrecht, pp. 297–311 (2000)Google Scholar
- 18.Seshadri R.: Inelastic evaluation of mechanical and structural components using the generalized local stress strain method of analysis. Nuclear Eng. Design 153, 287–303 (1995)Google Scholar
- 19.Calladine, C.R.: A rapid method for estimating the greatest stress in a structure subject to creep. In: Proceedings of IMechE Conferences Thermal Loading Creep (1964)Google Scholar