Buckling Load Predictions of Panel and Shell using Vibration Correlation Technique

Prediction of buckling loads is a very important phenomenon for aerospace and marine industry. In this paper buckling predictions of a submarine hull is considered by using a shell element and a rectangular panel is considered by using a plate element. The buckling load of a submarine hull can be predicted by using vibration correlation technique. Determination of these buckling loads can be carried out based on the boundary conditions of the submarine hull structure. The technique will be carried by considering both surface conditions and to determine the crippling load of a hull. This paper aims to use VCT for a submarine hull structure used in marine, ocean and can compare the results to aerospace industry by considering a rectangular panel for which buckling is predicted using vibration correlation technique . VCT is not very extensively used in case of thermal buckling. However in this paper, VCT is applied to verify the thermal buckling of a simple thin rectangular panel subjected to parabolic loading.

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Experimental determination of the buckling load of rectangular plates using vibration correlation technique

STRUCTURAL ENGINEERING AND MECHANICS ◽

10.12989/sem.2011.37.3.331 ◽

2011 ◽

Vol 37 (3) ◽

pp. 331-349 ◽

Cited By ~ 3

Author(s):

Pairod Singhatanadgid ◽

Padol Sukajit

Keyword(s):

Experimental Determination ◽

Buckling Load ◽

Correlation Technique ◽

Rectangular Plates

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Buckling of nanobeams and nanorods with cracks

The proceedings of the 13th international conference "Modern Building Materials, Structures and Techniques" (MBMST 2019) ◽

10.3846/mbmst.2019.038 ◽

2019 ◽

Author(s):

Hina Arif ◽

Jaan Lellep

Keyword(s):

Cross Sections ◽

Nonlocal Theory ◽

Theory Of Elasticity ◽

Buckling Load ◽

Buckling Loads ◽

Critical Buckling Load ◽

Piecewise Constant ◽

Cracklike Defects ◽

General Method

Buckling of nanobeams and nanorods is treated with the help of the nonlocal theory of elasticity. The nanobeams under consideration have piecewise constant dimensions of cross sections and are weakened with cracks or cracklike defects emanating at the re-entrant corners of steps. A general method for determination of critical buckling loads of stepped nanobeams with cracks is developed. The influence of defects on the critical buckling load is evaluated numerically and compared with similar results of other researchers.

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DETERMINATION OF THE CRITICAL BUCKLING LOADS OF EULER COLUMNS USING STODOLA-VIANELLO ITERATION METHOD

Malaysian Journal of Civil Engineering ◽

10.11113/mjce.v30n3.514 ◽

2018 ◽

Vol 30 (3) ◽

Author(s):

Ofondu I.O. ◽

Ikwueze E.U. ◽

Ike C.C.

Keyword(s):

Iteration Method ◽

Longitudinal Axis ◽

Rayleigh Quotient ◽

Buckling Load ◽

Buckling Loads ◽

Critical Buckling Load ◽

Relative Errors ◽

Fixed End

The Stodola-Vianello iteration method was implemented in this work to determine the critical buckling load of an Euler column of length l with fixed end (x = 0) and pinned end (x = l), where the longitudinal axis is the x-direction.The critical buckling loads were found to be variable, depending on the x-coordinate. Integration and the Rayleigh quotients were used to find average buckling coefficients. First iteration gave relative errors of 4% using integration and 2.5% using Rayleigh quotient.Second iteration gave average relative errorsless than 1% for both the integration and the Rayleigh quotients. Better estimates of the critical buckling loads were obtained using the Rayleigh quotient in the Stodola-Vianello’s iteration.

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The Linearization of the Prebuckling State and Its Effect on the Determined Instability Loads

Journal of Applied Mechanics ◽

10.1115/1.3564770 ◽

1969 ◽

Vol 36 (4) ◽

pp. 775-783 ◽

Cited By ~ 45

Author(s):

A. D. Kerr ◽

M. T. Soifer

Keyword(s):

Exact Solution ◽

Perturbation Analysis ◽

Degrees Of Freedom ◽

Elastic System ◽

Buckling Load ◽

Nonlinear Formulation ◽

Shallow Arch ◽

Buckling Loads ◽

State Of Stress

The effect of the linearization of the prebuckled state upon the determined buckling loads is studied first on an elastic system of two degrees of freedom and then on a shallow arch subjected to a uniform lateral load; structures that exhibit a nontrivial state of stress, an upper buckling load, a lower buckling load, and a bifurcation load. For each case the exact solution of the nonlinear formulation is discussed first. Then, using the perturbation analysis, the instability loads are determined again using the exact and the linearized prebuckled state, respectively. The paper concludes with a comparison of the obtained buckling loads and a discussion of relevant problems. It was found that the usual “adjacent equilibrium” argument presented in the literature, according to which only the displacements are perturbed, is not applicable for the determination of the bifurcation pressures of the shallow arch. A proper argument is presented and then used to determine the bifurcation and limit points.

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Flexural-Torsional Buckling of Pultruded Fiber-Reinforced Polymer Angle Beams under Eccentric Loading

Materials Science Forum ◽

10.4028/www.scientific.net/msf.982.201 ◽

2020 ◽

Vol 982 ◽

pp. 201-206

Author(s):

Jaksada Thumrongvut ◽

Natthawat Pakwan ◽

Samaporn Krathumklang

Keyword(s):

Buckling Load ◽

Fiber Reinforced Polymer ◽

Width Ratio ◽

Fiber Reinforced ◽

Torsional Buckling ◽

Eccentric Load ◽

Buckling Loads ◽

Reinforced Polymer ◽

Cross Sectional Dimension ◽

Flexural Torsional Buckling

In this paper, the experimental study on the pultruded fiber-reinforced polymer (pultruded FRP) angle beams subjected to transversely eccentric load are presented. A summary of critical buckling load and buckling behavior for full-scale flexure tests with various span-to-width ratios (L/b) and eccentricities are investigated, and typical failure mode are identified. Three-point flexure tests of 50 pultruded FRP angle beams are performed. The E-glass fibre/polyester resin angle specimens are tested to examine the effect of span-to-width ratio of the beams on the buckling responses and critical buckling loads. The angle specimens have the cross-sectional dimension of 76x6.4 mm with span-to-width ratios, ranging from 20 to 40. Also, four different eccentricities are investigated, ranging from 0 to ±2e. Eccentric loads are applied below the horizontal flange in increments until beam buckling occurred. Based upon the results of this study, it is found that the load and mid-span vertical deflection relationships of the angle beams are linear up to the failure. In contrast, the load and mid-span lateral deflection relationships are geometrically nonlinear. The general mode of failure is the flexural-torsional buckling. The eccentrically loaded specimens are failed at critical buckling loads lower than their concentric counterparts. Also, the quantity of eccentricity increases as buckling load decreases. In addition, it is noticed that span-to-width ratio increases, the buckling load is decreased. The eccentric location proved to have considerable influence over the buckling load of the pultruded FRP angle beams.

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Concurrent numerical implementation of vibration correlation technique for fast buckling load prediction of cylindrical shells under combined loading conditions

Engineering With Computers ◽

10.1007/s00366-021-01458-9 ◽

2021 ◽

Author(s):

Kuo Tian ◽

Lei Huang ◽

Musen Yang ◽

Yan Chen ◽

Peng Hao ◽

...

Keyword(s):

Cylindrical Shells ◽

Buckling Load ◽

Combined Loading ◽

Correlation Technique ◽

Numerical Implementation ◽

Loading Conditions ◽

Load Prediction

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CFRP Origami Metamaterial with Tunable Buckling Loads: A Numerical Study

Materials ◽

10.3390/ma14040917 ◽

2021 ◽

Vol 14 (4) ◽

pp. 917

Author(s):

Houyao Zhu ◽

Shouyan Chen ◽

Teng Shen ◽

Ruikun Wang ◽

Jie Liu

Keyword(s):

Numerical Study ◽

Buckling Load ◽

Fe Modelling ◽

Buckling Loads ◽

Folding Angle ◽

Mechanical Responses ◽

Reinforced Plastic ◽

Rate Of Increase ◽

Practical Engineering ◽

Identical Rate

Origami has played an increasingly central role in designing a broad range of novel structures due to its simple concept and its lightweight and extraordinary mechanical properties. Nonetheless, most of the research focuses on mechanical responses by using homogeneous materials and limited studies involving buckling loads. In this study, we have designed a carbon fiber reinforced plastic (CFRP) origami metamaterial based on the classical Miura sheet and composite material. The finite element (FE) modelling process’s accuracy is first proved by utilizing a CFRP plate that has an analytical solution of the buckling load. Based on the validated FE modelling process, we then thoroughly study the buckling resistance ability of the proposed CFRP origami metamaterial numerically by varying the folding angle, layer order, and material properties, finding that the buckling loads can be tuned to as large as approximately 2.5 times for mode 5 by altering the folding angle from 10° to 130°. With the identical rate of increase, the shear modulus has a more significant influence on the buckling load than Young’s modulus. Outcomes reported reveal that tunable buckling loads can be achieved in two ways, i.e., origami technique and the CFRP material with fruitful design freedoms. This study provides an easy way of merely adjusting and controlling the buckling load of lightweight structures for practical engineering.

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