The Southwell Method for Predicting Plastic Buckling Loads for Elbows

[+] Author and Article Information
L. H. Sobel

Westinghouse Advanced Reactors Division, Madison, Pa. 15663

J. Pressure Vessel Technol 105(1), 2-8 (Feb 01, 1983) (7 pages) doi:10.1115/1.3264236 History: Received March 14, 1982; Revised August 06, 1982; Online November 05, 2009


The Southwell method for the prediction of buckling loads is applied to results obtained from tests of two 16-in-dia Type 304 stainless steel elbows loaded by an in-plane closing bending moment M . The basis of the method is discussed, and it is shown that proper application of the method requires that the nonlinear component of the deformation, δ nl , be used in the Southwell plot. Predicted buckling loads determined from four experimental M-δ nl curves for each test are found to be consistent and accurate, with an average value that is only slightly above the experimental plastic buckling load. The major conclusion of this paper is that the Southwell method based on δ nl is valid for elbows loaded by an in-plane closing bending moment, and for a certain broader class of elastic or plastic nonlinear buckling (geometric collapse) problems for imperfection-insensitive structures. Consequently, tests and analyses of such structures need not be carried out to buckling to determine buckling loads. Practical advantages of such nonbuckling tests and analyses are discussed.

Copyright © 1983 by ASME
Your Session has timed out. Please sign back in to continue.





Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In