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RESEARCH PAPERS

Method and Mechanism of Beneficial Residual Stresses in Tubes

[+] Author and Article Information
N. V. Lê

Mechanical Engineering Department, École de Technologie Supérieure, 4750 Henri-Julien, Montréal, Canada H2T 2C8

J. Pressure Vessel Technol 116(2), 175-178 (May 01, 1994) (4 pages) doi:10.1115/1.2929572 History: Received January 31, 1990; Revised November 16, 1993; Online June 17, 2008

Abstract

It is shown in this paper that residual stresses in a tube could be created in such a way that they are in tension in the middle region of the wall and in compression throughout the entire inside and outside surfaces of the tube. The method of treatment consists of applying an internal pressure and some appropriate alternating hot and cold thermal shocks to the tube. The mechanism of stress evolution in tube wall is demonstrated using elastic-perfectly plastic analysis of a generalized plane strain ID model subjected to a primary tension load σm , and an alternating linear temperature difference ΔT across the thickness. Theoretical combinations of loads (σm , ΔT ) which give such residual stress configurations and formulas for predicted residual stresses are developed. A possible application of this treatment is for prolonging the life of U-bend region of heat exchanger tubes against stress corrosion cracking.

Copyright © 1994 by The American Society of Mechanical Engineers
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