Affiliation:
1. Babcock & Wilcox Canada, 581 Coronation Boulevard, Cambridge, Ontario N1R 5V3, Canada
Abstract
Some Class I CANDU heat exchanger tubesheets experience very high in-plane thermal gradients under Level A/B transients. If the thermal stresses exceed the ratcheting limit of the ASME Boiler and Pressure Vessel Code, shakedown has to be demonstrated by an elastic-plastic analysis. The choice of the plasticity model and its parameters must ensure that shakedown is predicted only if it occurs in reality. Differences to uniaxial modeling are discussed, and a conservative way of predicting shakedown is presented. The perforated region of the tubesheet is replaced by an equivalent solid plate with anisotropic yield properties (Hill’s yield criterion). A lower-bound shakedown limit for this material is derived. An example analysis is presented that has been performed using a commercial finite element code. [S0094-9930(00)00303-6]
Subject
Mechanical Engineering,Mechanics of Materials,Safety, Risk, Reliability and Quality
Reference17 articles.
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2. ASME, 1992, Boiler and Pressure Vessel Code, Section III, Division 1, Subsection NB, The American Society of Mechanical Engineers, New York, NY.
3. Slot, T., and Branca, T. R., 1974, “On the Determination of Effective Elastic-Plastic Properties for the Equivalent Solid Plate Analysis of Tube Sheets,” ASME J. Pressure Vessel Technol., 86, pp. 220–227.
4. Lemaitre, J., and Chaboche, J.-L., 1990, Mechanics of Solid Materials, Cambridge University Press, Cambridge, UK.
5. Kamenjarzh, J., and Merzijakov, A., 1994, “On Kinematic Method in Shakedown Theory: I. Duality of Extremum Problems,” Int. J. Plast., 10, No. 4, pp. 363–380.
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