【压力容器---毕设翻译用---外文文献】COMPUTATIONAL BUCKLING ANALYSIS OF SHELLS.pdf

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COMPUTATIONAL BUCKLING ANALYSIS OF SHELLS:
THEORIES AND PRACTICE

Luis A. Godoy * and Eduardo M. Sosa **

* Professor, Universidad Nacional de Córdoba, FCEFyN, Departamento de Estructuras,
and researcher, CONICET
Casilla de Correo 916, Correo Central, Córdoba 5000, .

** Graduate student, University of Puerto Rico, Mayaguez, PR 00681-9041, Puerto Rico


Key words: ABAQUS, Buckling, Finite elements, Shells, Structural stability, Tanks.

Abstract. Shell buckling problems belong to the class of geometrically nonlinear behavior,
and may be coupled with material nonlinearity of the shell. There are many general-purpose
finite element programs that perform geometric and material nonlinear analysis of shells;
however, this does not mean that a user can feed data and collect reliable results without a
full understanding of the physics of the problem. This paper discusses the theories involved in
the explanation and classification of phenomena, and in the prediction of results. Next, those
approaches are considered in the practical analysis of one shell form, namely thin-walled
steel tanks used to store oil. Results have been obtained with the general-purpose package
ABAQUS, and they tend to show that their interpretation requires the use of Koiter’s theory in
order to make sense of what is obtained. Some thoughts on possible ways to implement Croll’s
lower bound reduced energy approach in practice are given.





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1. INTRODUCTION

In this paper we consider the phenomenon of buckling as a process of change in the shape
of a structure. Engineers design structures with a well-defined shape thoughtfully chosen to
fulfill some purpose. But