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