Influence of initial geometric imperfections on vibrations of thin circular cylindrical shells

1983 ◽  
Vol 16 (1-4) ◽  
pp. 125-130 ◽  
Author(s):  
Lakshman Watawala ◽  
William A. Nash
Keyword(s):  
Cylindrical Shells ◽  
Geometric Imperfections ◽  
Circular Cylindrical Shells ◽  
Initial Geometric Imperfections

Dynamic Buckling of Externally Pressurized Imperfect Cylindrical Shells

1975 ◽  
Vol 42 (2) ◽  
pp. 316-320 ◽  
Author(s):  
D. Lockhart ◽  
J. C. Amazigo
Keyword(s):  
Asymptotic Expression ◽  
Cylindrical Shells ◽  
Simple Relation ◽  
Dynamic Buckling ◽  
Fourier Component ◽  
Buckling Load ◽  
Buckling Mode ◽  
Geometric Imperfections ◽  
Circular Cylindrical Shells ◽  
Step Loading

The dynamic buckling of imperfect finite circular cylindrical shells subjected to suddenly applied and subsequently maintained lateral or hydrostatic pressure is studied using a perturbation method. The geometric imperfections are assumed small but arbitrary. A simple asymptotic expression is obtained for the dynamic buckling load in terms of the amplitude of the Fourier component of the imperfection in the shape of the classical buckling mode. Consequently, for small imperfection, there is a simple relation between the dynamic buckling load under step-loading and the static buckling load. This relation is independent of the shape of the imperfection.

Evaluation of stiffened shell characteristics from imperfection measurements

1987 ◽  
Vol 22 (1) ◽  
pp. 17-23 ◽  
Author(s):  
H Abramovich ◽  
R Yaffe ◽  
J Singer
Keyword(s):  
Cylindrical Shells ◽  
Data Bank ◽  
Laboratory Scale ◽  
Experimental Results ◽  
Geometric Imperfections ◽  
Buckling Loads ◽  
Stiffened Shell ◽  
Initial Geometric Imperfections ◽  
Stiffened Cylindrical Shells

The measurement of initial geometric imperfections of stringer-stiffened cylindrical shells on a laboratory scale is reviewed and recent results are presented. Buckling loads are predicted by the multimode analysis and are compared with experimental results. The concept and purpose of an international imperfection data bank is outlined and the activity of the Technion branch is described. An evaluation of the characteristics of shells from their measured imperfection record is attempted.

Hybrid Randomness of Initial Imperfections and Axial Loading in Reliability of Cylindrical Shells

2010 ◽  
Vol 77 (3) ◽  
Author(s):  
Isaac Elishakoff ◽  
Lova Andriamasy ◽  
Maurice Lemaire
Keyword(s):  
Cylindrical Shells ◽  
Axial Loading ◽  
Combined Effect ◽  
Geometric Imperfections ◽  
Initial Imperfections ◽  
Applied Loading ◽  
Initial Geometric Imperfections

This study investigates the combined effect of randomness in initial geometric imperfections and the applied loading on the reliability of axially compressed cylindrical shells. In order to gain insight we consider simplest possible case when both the initial imperfections and the applied loads are uniformly distributed. It is shown that hybrid randomness may increase or decrease the reliability of the shell if the latter is treated, experiencing the sole randomness in initial imperfections.

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