Buckling load prediction of grid-stiffened composite cylindrical shells using the vibration correlation technique

2018 ◽  
Vol 167 ◽  
pp. 470-481 ◽  
Author(s):  
Davoud Shahgholian-Ghahfarokhi ◽  
Gholamhossein Rahimi
Keyword(s):  
Cylindrical Shells ◽  
Buckling Load ◽  
Correlation Technique ◽  
Load Prediction ◽  
Composite Cylindrical Shells

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

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.

scholarly journals Buckling Test of Composite Cylindrical Shells with Large Radius Thickness Ratio

2021 ◽  
Vol 11 (2) ◽  
pp. 854
Author(s):  
Atsushi Takano ◽  
Ryuta Kitamura ◽  
Takuma Masai ◽  
Jingxuan Bao
Keyword(s):  
Cylindrical Shells ◽  
Design Criterion ◽  
Thickness Ratio ◽  
Buckling Load ◽  
Large Radius ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Buckling Test ◽  
Composite Cylinders ◽  
Composite Cylindrical Shells

A buckling test of composite cylindrical shells with a radius–thickness ratio (r/t) = 893 under axial compression was conducted to investigate the effects of the radius–thickness ratio (r/t). It is known that the buckling load of cylinders shows large differences and scatter between theory and experiment. The ratio of the experimental buckling load and theoretical buckling load is called the knockdown factor (KDF). Many investigations have been conducted to find the cause of the degradation and scatter in the KDF, but as yet, no cause has been found. In 1968, NASA’s buckling design criterion, NASA SP-8007, gave an empirical KDF curve that decreased with the increasing r/t (up to 2000) for metal cylinders. The same curve has been applied to composite cylinders. Recently, Takano derived a flat lower-bound KDF in terms of A- and B-basis values (99% and 90% probability with a 95% confidence level) through a statistical analysis of experimental buckling loads. The result, however, based on experimental results up to r/t = 500 and, thus, the dependency on a large range of r/t, is not clear. Thus, the authors focused on a larger range of r/t. Cylindrical shells made from carbon fiber-reinforced plastic (CFRP) were tested. The nominal radius, thickness, and length were r = 100.118 mm, t = 0.118 mm, and L = 200 mm and, thus, the r/t = 848 and length-to-radius ratio (L/r) = 2.0. Shape imperfections were also measured by using in-house laser displacement equipment. The buckling load was slightly affected by the r/t, but the reduction in the KDF was insignificant.

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

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
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