scholarly journals Experimental Test for Estimation of Buckling Load on Unstiffened Cylindrical shells by Vibration Correlation Technique

2017 ◽  
Vol 172 ◽  
pp. 1023-1030 ◽  
Author(s):  
Eduards Skukis ◽  
Olgerts Ozolins ◽  
Kaspars Kalnins ◽  
Mariano A. Arbelo
Keyword(s):  
Experimental Test ◽  
Cylindrical Shells ◽  
Buckling Load ◽  
Correlation Technique

scholarly journals Experimental Nondestructive Test for Estimation of Buckling Load on Unstiffened Cylindrical Shells Using Vibration Correlation Technique

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Kaspars Kalnins ◽  
Mariano A. Arbelo ◽  
Olgerts Ozolins ◽  
Eduards Skukis ◽  
Saullo G. P. Castro ◽  
...  
Keyword(s):  
Large Scale ◽  
Numerical Models ◽  
Cylindrical Shells ◽  
Laser Scanner ◽  
Experimental Tests ◽  
Buckling Load ◽  
Correlation Technique ◽  
Thin Walled Structures ◽  
Instability Point ◽  
Thin Walled

Nondestructive methods, to calculate the buckling load of imperfection sensitive thin-walled structures, such as large-scale aerospace structures, are one of the most important techniques for the evaluation of new structures and validation of numerical models. The vibration correlation technique (VCT) allows determining the buckling load for several types of structures without reaching the instability point, but this technique is still under development for thin-walled plates and shells. This paper presents and discusses an experimental verification of a novel approach using vibration correlation technique for the prediction of realistic buckling loads of unstiffened cylindrical shells loaded under axial compression. Four different test structures were manufactured and loaded up to buckling: two composite laminated cylindrical shells and two stainless steel cylinders. In order to characterize a relationship with the applied load, the first natural frequency of vibration and mode shape is measured during testing using a 3D laser scanner. The proposed vibration correlation technique allows one to predict the experimental buckling load with a very good approximation without actually reaching the instability point. Additional experimental tests and numerical models are currently under development to further validate the proposed approach for composite and metallic conical structures.

Experimental and numerical estimation of buckling load on unstiffened cylindrical shells using a vibration correlation technique

2015 ◽  
Vol 94 ◽  
pp. 273-279 ◽  
Author(s):  
Mariano A. Arbelo ◽  
Kaspars Kalnins ◽  
Olgerts Ozolins ◽  
Eduards Skukis ◽  
Saullo G.P. Castro ◽  
...  
Keyword(s):  
Cylindrical Shells ◽  
Buckling Load ◽  
Correlation Technique ◽  
Numerical Estimation

Vibration correlation technique for the estimation of real boundary conditions and buckling load of unstiffened plates and cylindrical shells

2014 ◽  
Vol 79 ◽  
pp. 119-128 ◽  
Author(s):  
Mariano A. Arbelo ◽  
Sérgio F.M. de Almeida ◽  
Maurício V. Donadon ◽  
Sandro R. Rett ◽  
Richard Degenhardt ◽  
...  
Keyword(s):  
Boundary Conditions ◽  
Cylindrical Shells ◽  
Buckling Load ◽  
Correlation Technique

RELIABILITY ASSESSMENT OF AXIALLY COMPRESSED COMPOSITE CYLINDRICAL SHELLS WITH RANDOM IMPERFECTIONS

2011 ◽  
Vol 11 (02) ◽  
pp. 215-236 ◽  
Author(s):  
MATTEO BROGGI ◽  
ADRIANO CALVI ◽  
GERHART I. SCHUËLLER
Keyword(s):  
Mathematical Models ◽  
Axial Compression ◽  
Cylindrical Shells ◽  
Reliability Assessment ◽  
Buckling Analysis ◽  
Buckling Load ◽  
Experimental Results ◽  
Drastic Decrease ◽  
Different Types ◽  
Probability And Statistics

Cylindrical shells under axial compression are susceptible to buckling and hence require the development of enhanced underlying mathematical models in order to accurately predict the buckling load. Imperfections of the geometry of the cylinders may cause a drastic decrease of the buckling load and give rise to the need of advanced techniques in order to consider these imperfections in a buckling analysis. A deterministic buckling analysis is based on the use of the so-called knockdown factors, which specifies the reduction of the buckling load of the perfect shell in order to account for the inherent uncertainties in the geometry. In this paper, it is shown that these knockdown factors are overly conservative and that the fields of probability and statistics provide a mathematical vehicle for realistically modeling the imperfections. Furthermore, the influence of different types of imperfection on the buckling load are examined and validated with experimental results.

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.

Experimental validation of the vibration correlation technique robustness to predict buckling of unstiffened composite cylindrical shells

2019 ◽  
Vol 224 ◽  
pp. 111107 ◽  
Author(s):  
Felipe Franzoni ◽  
Falk Odermann ◽  
Edgars Lanbans ◽  
Chiara Bisagni ◽  
Mariano Andrés Arbelo ◽  
...  
Keyword(s):  
Experimental Validation ◽  
Cylindrical Shells ◽  
Correlation Technique ◽  
Composite Cylindrical Shells

Optimization and Antioptimization of Buckling Load for Composite Cylindrical Shells Under Uncertainties

AIAA Journal ◽  
2012 ◽  
Vol 50 (7) ◽  
pp. 1513-1524 ◽  
Author(s):  
Isaac Elishakoff ◽  
Benedikt Kriegesmann ◽  
Raimund Rolfes ◽  
Christian Hühne ◽  
Alexander Kling
Keyword(s):  
Cylindrical Shells ◽  
Buckling Load ◽  
Composite Cylindrical Shells
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