Discussion of “Mechanics of Confined Thin-Walled Cylinders Subjected to External Pressure,” (Vasilikis, D., and Karamanos, S., 2014, Appl. Mech. Rev., 66(1), p. 010801)

[+] Author and Article Information
Arnold M. Gresnigt

Faculty of Civil Engineering and Geosciences,
Delft University of Technology,
P.O. Box 5048,
2600 GA Delft, The Netherlands
e-mail: a.m.gresnigt@tudelft.nl

Manuscript received September 30, 2013; final manuscript received November 22, 2013; published online December 23, 2013. Editor: Harry Dankowicz.

Appl. Mech. Rev 66(1), 015502 (Dec 23, 2013) (2 pages) Paper No: AMR-13-1077; doi: 10.1115/1.4026185 History: Received September 30, 2013; Revised November 22, 2013

The collapse pressure of confined cylinders depends on many factors. In addition to the thorough investigations of Vasilikis and Karamanos, more factors can be candidates for further investigation, such as the effect of variations in the material mechanical properties of the liner pipe in compression and the effect of residual stresses. The mechanical response of the materials in compression depends on the type of steel and the stress-strain history, which depends on the fabrication method of the cylinder. This is illustrated with theoretical and experimental results on pipes under external pressure, as used in offshore applications. There is a need for more experimental test results for validation. More applications of confined cylinders are mentioned that are worth investigation.

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Grahic Jump Location
Fig. 1

Wrinkling in lined pipes due to bending [1,2]

Grahic Jump Location
Fig. 2

Pipe ovalization due to surcharge

Grahic Jump Location
Fig. 3

Stress-strain behavior of stainless steel (liner), compared to carbon steel (the outer pipe, the strongest) [1]

Grahic Jump Location
Fig. 4

Compressive stress-strain diagrams of seamless pipe (left, no Bauschinger effect) and UOE pipe (right, Bauschinger effect) [4,5]





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