Asymptotic methods in the buckling theory of elastic shells by Andrei L. Smirnov, Petr E. Tovstik PDF
By Andrei L. Smirnov, Petr E. Tovstik
This paintings comprises ideas to the commonest difficulties of skinny elastic shells buckling less than conservative so much. The linear difficulties of bifurcation of shell equilibrium are thought of utilizing a two-dimensional concept of the Kirchhoff-Love kind. unique consciousness is dedicated to the examine of the shells of detrimental Gaussian curvature, the buckling of which has a few particular gains. The buckling modes localized close to the weakest traces or issues at the impartial floor are developed, together with the buckling modes localized close to the weakly supported shell side. The relatives among the buckling modes and bending of the impartial floor are analyzed. many of the utilized asymptotic equipment are typical; the others are new and are used for the 1st time during this booklet to review skinny shell buckling. The options bought within the kind of uncomplicated approximate formulation supplement the numerical effects, and allow one to elucidate the physics of buckling.
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Additional info for Asymptotic methods in the buckling theory of elastic shells
2. 1 (b), the curve OCQG corresponds to a shell with imperfections. Arc OC of this curve corresponds to the pre-buckling stress-strain state. Arcs EN and QG show the stable post-buckling equilibrium states under large deflections. We will introduce the following notation to assist in the analysis. The ordinates P " and P " of points B and C are called the upper critical loads for the ideal shell and the shell with imperfections. The smallest load under which the post-buckling stable equilibrium state is possible, is called the lower critical load.
Find the general index of variation, and the direction in which the partial index of variation is minimal as h —>• 0 for the following functions: a) F(x, y, h) = g(x) sin (z(x — ay)), where z — h~t, b) F(x, y, h) = exp (z~ J, where z = h~f, assuming t > 0. Answer For a) and b) the index of variation is equal to —t. For a) in the direction x = ay the partial index of variation is equal to 0. 11. Problems and Exercises 35 For b) in the direction x = 0 the partial index of variation is equal to 0.
But in many cases the comparison of theoretical and experimental values of P , reveals their essential divergence. For example, in the problem of a cylindrical shell under compression by an axial force, the theoretical value of P , exceeds the experimental one by a factor of two or three and this divergence has been systematically observed in many experiments [33, 59, 61]. This flaw in the theory of shell stability was resolved by taking into account small imperfections, mainly of the neutral surface.
Asymptotic methods in the buckling theory of elastic shells by Andrei L. Smirnov, Petr E. Tovstik