Effect of Wall Thickness on Stress-Rupture Life of Tubular Specimens

[+] Author and Article Information
J. T. Tucker

Stress Analysis Group, The Babcock & Wilcox Company Research Center, Alliance, Ohio

E. E. Coulter

Engineering Physics Section, The Babcock & Wilcox Company Research Center, Alliance, Ohio

L. F. Kooistra

The Babcock & Wilcox Company Research Center, Alliance, Ohio

J. Basic Eng 82(2), 465-473 (Jun 01, 1960) (9 pages) doi:10.1115/1.3662624 History: Received February 24, 1959; Online November 04, 2011


Stress-rupture data obtained from tubular specimens stressed with internal pressure are compared with data from standard tension-bar specimens from the same heats of material. Agreement between the data of the two types of specimens is poor for thick-wall tubes when the hoop stress in the tube wall is calculated on an average stress basis. Better agreement is obtained with thin-wall tubes. These results show that any design formula that neglects the variation of stress through the thickness of a tube wall is unsatisfactory for thicker tubes. A dimensionless parameter method is presented which provides satisfactory correlation of the data for three materials, four test temperatures, and a wide range of wall thickness. Several areas in which additional research would be of value are discussed.

Copyright © 1960 by ASME
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