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SIZING OF A SPHERICAL SHELL AS VARIABLE THICKNESS UNDER DYNAMIC LOADS

  • Nurcan Aşçı
  • Habib Uysal
  • Ümit Uzman
Conference paper
  • 1.3k Downloads
Part of the Springer Proceedings in Physics book series (SPPHY, volume 111)

Abstract

In this paper, optimization of a spherical shell under various dynamic loads is investigated. The aim of this optimization problem is to minimize the volume of the shell. Design variables are corner thicknesses of each finite element. Constraints are stresses obtained from von Mises stress criterion not to exceed the yield stress in corner nodal points of each finite element at the top and bottom surfaces of shell and thicknesses are restricted not to be less than 2.5 mm. In addition to shell’s own weight, the vertical loads with equal intensity are applied at the nodal points on the upper edge of spherical shell, varying with respect to time function P(t). Time varying load vector is considered three different cases such as step, step after ramp and impulse functions.A program is coded with MapleV for optimization of spherical shell and finite element package program ANSYS is used for structural analysis. Obtained results are presented in graphical and tabular form. Finally, concluded remarks are given.

Keywords

Design Variable Spherical Shell Maximum Displacement Corner Thickness Sequential Linear Programming 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Asci, N. (2004) Optimization of a Spherical Shell with Variable Thickness Under the Various Dynamic Loads, Ph.D. Thesis, Department of Civil Engineering, Karadeniz Technical University, Turkey.Google Scholar
  2. Ding Y. (1986) Shape Optimization of Structures: A Literature Survey, Computers and Structures 24 985–1004.CrossRefMathSciNetzbMATHGoogle Scholar
  3. Gates, A. A., Accorsi, M. L. (1993) Automatic Shape Optimization of Three Dimensional Shell Structures with Large Shape Changes, Computers and Structures 49 167–178.CrossRefzbMATHGoogle Scholar
  4. Haftka, R. T., Prasad, B. (1979) Programs for Analysis and Resizing of Complex Structures, Computers Structures 10 323–330.CrossRefzbMATHGoogle Scholar
  5. Mota Soares, C. M., Mota Soares, C. A., Barbosa, J. I. (1994) Sensitivity Analysis and Optimal Design of Thin Shells of Revolution, AIAA Journal 32 1034–1042.ADSCrossRefzbMATHGoogle Scholar
  6. Pourazady, M. Fu, Z. (1996) An integrated Approach to Structural Shape Optimization, Computers and Structures 60 279–289.CrossRefzbMATHGoogle Scholar
  7. Zienkiewicz, O. C. and Campbell, J. S. (1973) Shape Optimization and Sequential Linear Programming. In Optimum Structural Design, John Wiley, New York.Google Scholar

Copyright information

© Springer 2006

Authors and Affiliations

  • Nurcan Aşçı
    • 1
  • Habib Uysal
    • 2
  • Ümit Uzman
    • 1
  1. 1.Gümüşhane Engineering FacultyKTÜGümüşhaneTurkey
  2. 2.Engineering FacultyAtatürk UniversityErzurumTurkey

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