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RESEARCH PAPERS

Proposal for Calculations of Flat Oval Pipes Under Internal Pressure Under Consideration of Material Plastification

[+] Author and Article Information
J. Jekerle

SHG-SCHACK GmbH, Ellenbacher Strasse 10, 34123 Kassel, Germany

J. Pressure Vessel Technol 119(3), 301-305 (Aug 01, 1997) (5 pages) doi:10.1115/1.2842308 History: Received July 17, 1995; Revised February 28, 1997; Online February 11, 2008

Abstract

In the wall of an oval pipe, additional to the circumferential forces, shear forces and bending moments occur under internal pressure load. Under this condition, the bending stresses in certain cross sections reach a figure many times that of normal stresses so that yield strength of the material can be exceeded. The usual stress calculation method is based on the calculation of the bending moments with the use of the elastic bending equation. The use of the part-plastic equation presented in the paper gives more accurate values for the bending moments sought in the cross sections being checked. This paper shows that even though the new calculation method leads to a smaller wall thickness of the flat oval pipe, the design of the flat oval pipe is nevertheless safe.

Copyright © 1997 by The American Society of Mechanical Engineers
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