Experiments on the Postbuckling Behavior of Circular Cylindrical Shells under Torsion

Yamaki, N.

doi:10.1007/978-3-642-50992-6_25

Cited by 16 publications

(4 citation statements)

References 6 publications

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“…For example, the 9 m shell tends towards the 'elephant foot'-shaped at each end, while the 20 m shell has a one-sided asymmetric buckle point around the mid-length. On the other hand, it was found that the circumferential wavelength has less influence on the axial compression buckling, especially for longer cylinders [38]. Figure 4 shows how the longitudinal wavenumber changed along the extreme fibre on the compression side, which depicts local curvature evolution of the upper 2/3 of its length.…”

Section: Buckling Behaviour Under Axial Compressionsmentioning

confidence: 99%

The Curvature – Energy Relations in Buckling Analysis of Tubular Wind Turbine Towers

Martínez-Vázquez

Baniotopoulos

2022

ce papers

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A former study on wind turbine tower collapse incidences throughout the past 40 years revealed that among the various types the buckling failure was the most catastrophic as led to collapse of tubular tower shell structures. As the modern harvesting of wind energy is usually performed by wind turbine towers being cylindrical shells of thin walls, the need of thorough investigation of the buckling behaviour of shell structures operating under extreme environmental actions is obvious. The present paper addresses such knowledge gap through the study of a series of 100 numerical models underpinned by the well‐established Riks Method for buckling analysis. The method enables the scrutiny of tower shell elements under axial load and bending moment. Within the proposed framework of curvature–energy analysis, the energy stored within an imperfect shell structure is expressed and quantified through cross‐section diaphragms and symbolic lines, covering pre‐buckling, transient stage, and post‐buckling performance close to the bifurcation point. The analysis unveils changes of local surface curvature and energy flows with multiple longitudinal and circumferential wavenumbers taking place during the pre‐buckling process. Wavenumbers and curvature changes induce the energy magnitude jumping over to the adjacent buckling eigenmodes. Furthermore, the mode jumping sees a faster and more convergence result with higher bending moments. The diversity of the final buckling mode largely determined by the variance of shell geometry, compression–bending ratio and boundary conditions.

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Section: Buckling Behaviour Under Axial Compressionsmentioning

confidence: 99%

The Curvature – Energy Relations in Buckling Analysis of Tubular Wind Turbine Towers

Martínez-Vázquez

Baniotopoulos

2022

ce papers

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“…However, the extent of this dependence changes for each loading case and shell geometry. While the imperfection sensitivity of medium-length shells varies depending on the radius-tothickness-(r/t-)ratio [2], [19], [20], for cylindrical shells under external pressure [9], [16] and shear loading [32], [37], additionally, the impact of the length-to-thickness-(l/t-)ratio must be taken into account. Thus, all geometric parameters should be assumed to be variable within this numerical study to investigate the reduction of the buckling resistance due to geometric imperfections and geometric nonlinearity.…”

Section: Imperfection Sensitivity Depending On the Imperfection Ampli...mentioning

confidence: 99%

Imperfection Sensitivity of Cylindrical Shells Under Shear Loading

Azizi

Stranghöner

2022

ce papers

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One of the basic load cases relevant for the design of shell structures is torsion, which can occur exemplary in silos and tanks under seismic actions or even under wind loading. To address the stability problem of cylindrical shells under this load case, the relevant design standard EN 1993‐1‐6 and the European Recommendation ECCS EDR5 provide simple approaches for the buckling design of cylindrical shells. In order to improve the current hand calculation rules given in the above documents, this numerical study attempts to include the imperfection sensitivity of cylindrical shells subjected to uniform torsion. In the present paper, theoretical, numerical, and experimental results from the literature are reviewed, and new systematic computational analyses and evaluations are introduced regarding the imperfection sensitivity of cylindrical shells under shear loading. For this purpose, a comprehensive computational study was performed using linear and nonlinear buckling analyses on perfect and imperfect shells. Since the influence of imperfections on the buckling strength of cylindrical shells is highly dependent on the imperfection pattern used in the numerical models, nonlinear buckling analyses were performed on imperfect cylindrical shells with three imperfection types: (i) eigenmode‐affine shape from torsion, (ii) longitudinal eigenmode‐affine pattern, and (iii) eigenmode‐affine shape from external pressure.

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“…The mechanical behavior of the above structural elements is extremely sensitive to the presence of geometric imperfections and the modeling of these geometric imperfections plays a pivotal role in accurately understanding the mechanical behavior by means of either an analytical or finite element analysis approaches. The complex behavior of these imperfect composite cylindrical shells subjected to axial compressive [1]- [3], bending [4] [5] and torsion [6]- [13] loads has been investigated by many researchers across the world and the complete understanding of the mechanical behavior of these cylindrical shells subjected to different combinations of these fundamental loads is still an active area of current research.…”

Section: Introductionmentioning

confidence: 99%

“…Yamaki [6] [7] and Wang et al [8] have carried out many experiments on the torsional buckling of elastic cylindrical shells and described that the buckling wave doesn't occupy the complete length of the long cylindrical shell in contrast to the short cylindrical shell. Wang et al [8] also compared their experimental torsional buckling results with that of Yamaki [6] results and furthermore they concluded that the influence of axial and circumferential boundary condition was less important in the torsional buckling analysis of elastic cylindrical shells. Kim et al [10] developed a 3D elastic solution to the buckling of orthotropic cylindrical shells subjected to torsional loads and the accuracy of the existing shell theories had been assessed with that of 3D elastic solution.…”

Section: Introductionmentioning

confidence: 99%

Post-Buckling Behavior of Laminated Composite Cylindrical Shells Subjected to Axial, Bending and Torsion Loads

Narayana¹,

Gunda²,

Reddy³

et al. 2015

WJET

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In present work, post-buckling behavior of imperfect (of eigen form) laminated composite cylindrical shells with different L/D and R/t ratios subjected to axial, bending and torsion loads has been investigated by using an equilibrium path approach in the finite element analysis. The Newton-Raphson approach as well as the arc-length approach is used to ensure the correctness of the equilibrium paths up to the limit point load. Post-buckling behavior of imperfect cylindrical shells with different L/D and R/t ratios of interest is obtained and the theoretical knock-down factors are reported for the considered cylindrical shells.

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Experiments on the Postbuckling Behavior of Circular Cylindrical Shells under Torsion

Cited by 16 publications

References 6 publications

The Curvature – Energy Relations in Buckling Analysis of Tubular Wind Turbine Towers

The Curvature – Energy Relations in Buckling Analysis of Tubular Wind Turbine Towers

Imperfection Sensitivity of Cylindrical Shells Under Shear Loading

Post-Buckling Behavior of Laminated Composite Cylindrical Shells Subjected to Axial, Bending and Torsion Loads

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