The analytical prediction of the contact stress in tube-to-tubesheet joints subjected to hydraulic expansion is conducted without any consideration to reverse yielding that can occur inside the tube. Most existing models consider the tube and tubesheet to unload elastically when the expansion pressure is released. These models are therefore less conservative as they overestimate the contact pressure. An analytical model that considers strain-hardening material behavior of the tube and tubesheet and accounts for reverse yielding has been developed. The model is based on Henckey deformation theory and the Von Mises yield criteria. The paper shows that reverse yielding that is present in tubes during hydraulic expansion unloading makes the joint less rigid and causes a decrease in the contact pressure depending on the gap clearance and the materials used. A good correlation between the analytical and finite elements results is obtained on different treated cases which gives confidence on the developed model.
Effect of Reverse Yielding on the Residual Contact Pressure in Tube-to-Tubesheet Joints
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received April 11, 2015; final manuscript received June 10, 2016; published online July 22, 2016. Assoc. Editor: Allen C. Smith.
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Bouzid, A., and Kazeminia, M. (July 22, 2016). "Effect of Reverse Yielding on the Residual Contact Pressure in Tube-to-Tubesheet Joints." ASME. J. Pressure Vessel Technol. December 2016; 138(6): 061402. https://doi.org/10.1115/1.4033934
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