Techno Press
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Structural Engineering and Mechanics   Volume 60, Number 3, November10 2016, pages 365-386
DOI: http://dx.doi.org/10.12989/sem.2016.60.3.365
 
Effects of imperfection shapes on buckling of conical shells under compression
Meisam Shakouri, Andrea Spagnoli and M.A. Kouchakzadeh

 
Abstract     [Full Text]
    This paper describes a systematic numerical investigation into the nonlinear elastic behavior of conical shells, with various types of initial imperfections, subject to a uniformly distributed axial compression. Three different patterns of imperfections, including first axisymmetric linear bifurcation mode, first non-axisymmetric linear bifurcation mode, and weld depression are studied using geometrically nonlinear finite element analysis. Effects of each imperfection shape and tapering angle on imperfection sensitivity curves are investigated and the lower bound curve is determined. Finally, an empirical lower bound relation is proposed for hand calculation in the buckling design of conical shells.
 
Key Words
    buckling; conical shell; imperfection sensitivity; weld depression
 
Address
Meisam Shakouri: Department of Aerospace Engineering, Semnan University, Semnan, Iran
Andrea Spagnoli: DICATeA, University of Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy
M.A. Kouchakzadeh: Department of Aerospace Engineering and Center of Excellence in Aerospace Systems, Sharif University of Technology, P.O. Box 11155-8639, Tehran, Iran
 

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