Bifurcation and Localization Instabilities in Cylindrical Shells under Bending. Part 1. Experiments
Abstract
This study is concerned with the problem of bending of long, circular cylindrical shells. Of particular interest is the response of such shells, bent into the plastic range of the material, and the various instabilities which limit the extent to which the shells can be loaded of deformed. It is well known that bending of relatively thin-walled circular tubes induces ovalization to the tube cross section (Brazier effect (1927)). The growth of ovalization causes of progressive reduction in the bending rigidity of the shell. Eventually, a maximum value of moment is reached. Further bending occurs at a dropping moment. For linearly elastic shells, when the maximum moment is reached the shell has undergone an ovalization which reduces the diameter of the cross section in the plane of bending by approximately 2/9ths. In practice, for thin shells, this limit load instability is often preceded by shell bifurcation-type instabilities characterized by circumferential and axial waves. In the case of thicker shells (D/t < 100, say), the response, as well as the instabilities, are strongly influenced by interaction between the induced ovalization and the plastic characteristics of the material.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1991
- Accession Number
- ADA242798
Entities
People
- G. T. Ju
- S. Kyriakides
Organizations
- University of Texas at Austin