Residual Stress of Thin-Wall Pipe Subjected to Axisymmetric Plastic Expansion

Author:

Chiba Norimasa1,Ishida Yuji1,Ogasawara Nagahisa1,Ito Hiroshi1,Enomoto Kunio2,Kimoto Hiroshi2

Affiliation:

1. Department of Mechanical Engineering, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa 239-8686, Japan

2. Mechanical Engineering Research Laboratory, Hitachi, Ltd., 3-1-1 Saiwaicho, Hitachi, Ibaraki 317-8511, Japan

Abstract

A straight pipe was expanded at one end by inserting a rigid disk. The residual stress measured at the inner surface shows a strong tensile peak beyond the region where the pipe was directly expanded by the insertion of the disk. The reason the residual stress reaches its peak at a location further into the pipe is discussed based on a FE analysis. The residual stress was found to reach its tensile peak at the plastic region front that was developed during the pipe expansion. A simple formula for identifying the tensile peak location is also proposed.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Safety, Risk, Reliability and Quality

Reference10 articles.

1. Williams, D. K., 1996, “Prediction of Residual Stress Field in Mechanically Expanded 0.750″ Diameter Steam Generator Tube Plugs-Part 1: 2-D Solution,” ASME PVP Vol. 327.

2. Takamatsu, H., 1991, “Aiming for Improved SG Reliability in Japan,” Nuclear Engineering International, Wilmington Publishing, Kent, UK, pp. 26–27.

3. Hill, R., 1950, The Mathematical Theory of Plasticity, Oxford Univ. Press, Section 2 in Chap. 5.

4. Jahed, H., and Dubey, R. N., 1997, “An Axisymmetric Method of Elastic-Plastic Analysis Capable of Predicting Residual Stress Field,” ASME J. Pressure Vessel Technol., 119, pp. 264–273.

5. Druez, J., Bazergui, A., and Pettigrew, M. J., 1985, “Residual Stresses in Roller-Expanded Thin Tubes,” Exp. Mech., 24, pp. 316–324.

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