Influence of material nonlinearity on the buckling resistance of stainless steel shells

Stranghöner, Natalie; Azizi, Esmaeil; Gorbachov, Anna

doi:10.1016/j.jcsr.2019.02.030

Cited by 6 publications

(9 citation statements)

References 3 publications

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“…While the "real" buckling strength of shell structures made of steel is highly sensitive to minor geometric imperfections [2], the loss of buckling resistance due to imperfections is often less for cylindrical shells under uniform external pressure than for other load directions (e.g. axial loading [20]) [21]. However, it is of exceptional importance to consider the geometric imperfections into the design process of cylindrical shells under external pressure because the "real" failure of these structures is dependent on imperfections [22], [23], which are introduced during the fabrication and manufacturing process.…”

Section: Imperfection Sensitivity Of Cylindrical Shells Subjected To ...mentioning

confidence: 99%

“…Whilst the imperfection sensitivity of medium-length cylindrical shells subjected to meridional compression changes only depending on the radius-to-thickness-(r/t-)ratio [2], [20], [39], [40], in case of external pressure, additionally, the length-to-thickness-(l/t-)ratio plays a strong role [21]. This means that the consideration of all geometric parameters is required in the numerical study to derive the reduction of the buckling strength caused by imperfections.…”

Section: Relationship Between the Imperfection Sensitivity And The Ge...mentioning

confidence: 99%

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Imperfection sensitivity of unstiffened cylindrical shells under external pressure

Azizi

Stranghöner

2021

ce papers

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The design rules for cylindrical shells subjected to uniform external pressure can be found in corresponding codes and recommendations, e.g. in EN 1993‐1‐6 (2007) or European Recommendation ECCS EDR5 (2008). Although the buckling strength of thin‐walled shells is highly dependent on the imperfections caused by various fabrication or manufacturing processes, the sensitivity of the buckling resistance of an imperfect shell to the amplitude of the geometric imperfections is not taken into account in design rules of standards. This paper investigates in detail the effect of boundary conditions and cylinder length on the linear buckling behaviour of cylindrical shells subjected to uniform external pressure. Following this, a comprehensive computational study is performed using geometrically nonlinear analyses on imperfect cylindrical shells with two‐imperfection types: (i) eigenmode‐affine form and (ii) longitudinal eigenmode‐affine pattern. Based on the numerical results obtained from eigenvalue analyses, the existing formulae of EN 1993‐1‐6 for the external pressure buckling factor Cβs of short cylindrical shells are modified to provide a more accurate prediction of the elastic critical circumferential buckling stress. The effects of geometric nonlinearity and imperfection sensitivity on the buckling strength are also briefly explored.

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Section: Imperfection Sensitivity Of Cylindrical Shells Subjected To ...mentioning

confidence: 99%

Section: Relationship Between the Imperfection Sensitivity And The Ge...mentioning

confidence: 99%

Imperfection sensitivity of unstiffened cylindrical shells under external pressure

Azizi

Stranghöner

2021

ce papers

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“…All nonlinear buckling analyses on perfect and imperfect cylindrical shells were conducted using the finite element program ANSYS APDL v20.1 [22] using the arc-length method, which is extensively used for nonlinear buckling analyses of shell structures (e.g. [14], [16], [21], [23]) and widely accepted. Herewith, the complete loaddeflection response of the investigated shells could be captured.…”

Section: Details Of Numerical Model Used For Nonlinear Buckling Analysesmentioning

confidence: 99%

“…In general, there is a dependence between the buckling strength with the wavenumbers and the size of buckles in the buckling mode [1], [2]. As widely known [16]- [21], the buckling modes induced by cylindrical shells under axial compression are usually very local and those for cylinders subjected to uniform external pressure are very large, see Figure 1. Thus, the shape of buckling modes plays an important role in the evaluation of the buckling behaviour of cylindrical shells in their pre-buckling and post-buckling ranges, resulting in a different imperfection sensitivity for cylindrical shells under different loading conditions.…”

Section: Generalmentioning

confidence: 99%

“…In addition, a preliminary series of LBA analyses were performed using the four-node shell element 181 with six degrees of freedom at each node and the eightnode shell element 281 with six degrees of freedom at each node. A comparison of the results from the linear buckling analyses with these two shell element types showed that the four-node shell element 181 is more suitable for use in finite element calculations of perfect thin-walled shells, see [16], [20], [21].…”

Section: Details Of Computational Models Used For Lba Analysesmentioning

confidence: 99%

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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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First-principle calculation of stainless steel 304N used in concrete-filled steel tubular

Guo

Liang

Deng

et al. 2019

IOP Conf. Ser.: Earth Environ. Sci.

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Stainless steel 304N was calculated in the paper for the possible use in concrete-filled steel tubular. Calculation results show that compared with conventional 304 ferrite stainless steel, 304N adds alloy element niobium. Because Nb has strong effect of fixing carbon and nitrogen and refining ferrite grain size, 304N has very uniform and fine ferrite structure in annealing state, and carbonitride precipitates very little at grain boundary. Its corrosion resistance, formability, weldability and wrinkle resistance are better than ordinary 304.

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Influence of material nonlinearity on the buckling resistance of stainless steel shells

Cited by 6 publications

References 3 publications

Imperfection sensitivity of unstiffened cylindrical shells under external pressure

Imperfection sensitivity of unstiffened cylindrical shells under external pressure

Imperfection Sensitivity of Cylindrical Shells Under Shear Loading

First-principle calculation of stainless steel 304N used in concrete-filled steel tubular

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