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]
Analysis of a Tubesheet Undergoing Rapid Transient Thermal Loading
Contributed by the Pressure Vessels and Piping Division and presented at the Pressure Vessels and Piping Conference, Boston, Massachusetts, August 1–5, 1999, of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS. Manuscript received by the PVP Division, October 27, 1999; revised manuscript received March 7, 2000. Technical editor: S. Y. Zamrik.
Reinhardt , W., Kizhatil , R., and McClellan, G. H. (March 7, 2000). "Analysis of a Tubesheet Undergoing Rapid Transient Thermal Loading ." ASME. J. Pressure Vessel Technol. November 2000; 122(4): 476–481. https://doi.org/10.1115/1.1286018
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