Buckling of axially compressed CFRP cylinders with and without additional lateral load: Experimental and numerical investigation

Khakimova, Regina; Castro, Saullo G.P.; Wilckens, Dirk; Rohwer, K.; Degenhardt, Richard

doi:10.1016/j.tws.2017.06.002

Cited by 75 publications

(21 citation statements)

References 16 publications

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“…The upper and lower ends of the cylinder were additionally reinforced with graded CFRP padups (90-degree layers which were additionally added to the cylinder surface by winding) in order to assist the load introduction. The surface of the test article was measured using ATOS, an optical 3D digitizing measurement system based on photogrammetry, which is utilized to extract the initial geometric imperfections of the shell using a best-fit procedure aimed to eliminate rigid body motions modes from the measurements [38]. The deviation from the ideal cylinder geometry and the measured points is shown in Fig.…”

Section: Test Articlementioning

confidence: 99%

“…A similar project started 2012 in Europe, the DESICOS project [32] (new robust DESign guideline for Imperfection sensitive COmposite launcher Structures) to develop and validate new deterministic [33], probabilistic [34] as well as experimental [35], [36] design approaches for composite shells [37], [38], [39], [40]. A comprehensive overview regarding this project is for example given in [2].…”

Section: Introductionmentioning

confidence: 99%

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Buckling analysis of an imperfection-insensitive hybrid composite cylinder under axial compression – numerical simulation, destructive and non-destructive experimental testing

Wagner

Petersen

Khakimova³

et al. 2019

Composite Structures

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Thin-walled shells like cylinders are primary structures in launch-vehicle systems. When subjected to axial loading these shells are prone to buckling. The corresponding critical load heavily depends on deviations from the ideal shell shape. In general, these deviations are defined as geometric imperfections and although imperfections exhibit comparatively low amplitudes, they can significantly reduce the critical load. Considering the influence of geometric imperfections adequately into the design process of thin-walled shells poses major challenges for structural design. An alternative to robust design of thin-walled shell by accurate consideration of geometric imperfections is the development of a robust or imperfection-insensitive shell architecture. In this article a special hybrid cylinder is presented and analyzed. The composite shell design is based on an interstage structure of the Ariane 6 by MT Aerospace and has special CFRP belts which are intended to reduce the imperfection sensitivity of the shell. The shell was tested at the German Aerospace Center in Braunschweig and the corresponding results are presented and described. The hybrid cylinder was analyzed with the Southwell-method and geometrically nonlinear finite element analyzes. The results show that the Southwell-method delivers conservative buckling load estimations and that the CFRP belts reduce the imperfection sensitivity significantly.

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Section: Test Articlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Buckling analysis of an imperfection-insensitive hybrid composite cylinder under axial compression – numerical simulation, destructive and non-destructive experimental testing

Wagner

Petersen

Khakimova³

et al. 2019

Composite Structures

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“…An alternative approach to assess the imperfection sensitivity of complex shell structures is the application of perturbation or lower-bound methods [57]. Deterministic lower-bound methods are applied in order to quantify the influence of so called "worst" imperfections and were extensively studied within the DESICOS project [58] (new robust DESign guideline for Imperfection sensitive COmposite launcher Structures) in order to develops and validates new deterministic [59], [60], [61] probabilistic [30] as well as experimental [62], [63] design approaches for composite shells [64], [65]. A comprehensive overview regarding this project is for example given in [66].…”

Section: Introductionmentioning

confidence: 99%

Probabilistic and deterministic lower-bound design benchmarks for cylindrical shells under axial compression

Wagner

Hühne

Elishakoff

2020

Thin-Walled Structures

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This article contains examples to demonstrate the use of different design concepts for cylindrical shells under axial compression. The examples are based on shells which were manufactured according to electroplating, machining, welding (isotropic cylinders) and prepreg hand layup on a mandrel (composite cylinders). Three of the four shell series are characterized by pure elastic buckling and one shell series buckled in the elastic-plastic region. All relevant data for the numerical analysis are described in the article and summarized in the Elsevier repository of this article (geometry, material, measured imperfection data and Python-ABAQUS scripts). The design concepts are based on the geometric imperfection signatures, probabilistic and deterministic lower-bound methods. The design concepts are representative for the development of design approaches for imperfection sensitive shells from the early 1980 to the late 2010 and are validated with experimental data. Recently developed design lower-bound curves for axially loaded cylinders are presented and compared with currently used design criteria like the Eurocode EN 1993-1-6 and the NASA SP-8007. The results of this article show that the design of imperfection sensitive cylinders has been significantly improved in the last 30 years.

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“…Unlike the SPLA approach, the SBPA on the other hand induced a single dimple at the top of the shell by means of a boundary perturbation under axial compression which causes an additional small bending moment. Comparison between experimental and numerical predictions on the buckling of axially compressed, unstiffened composite cylinders with the additional of lateral load was presented in [8]. Results from all investigations except [9], were compared with knockdown factor prediction (KDF) by NASA SP-8007 guideline [11].…”

Section: Introductionmentioning

confidence: 99%

Instability of Conical Shells with Multiple Dimples under Axial Compression

Ifayefunmi¹,

Mahidan²,

Maslan³

2020

IJRTE

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Abstract: Thin-walled conical shells are primary structures in offshore application. Presence of imperfection can considerably reduce the load carrying capacity of such structures when in use. : two perfect, and the remaining six with MPLA imperfection amplitude, A, of 0.56, 1.12 and 1.68 0.91 to 1.13. This study examines the buckling behavior of axially compressed imperfect steel cones using the multiple perturbation load analysis (MPLA). This is both a numerical and experimental study. Eight conical shell test models were manufactured in pairs and collapsed under axial compression having two equally-spaced dimples on each cones. Experimental test results for all the conical shell models and the accompanying numerical predictions are given in this paper. Repeatability of experimental data was good. The errors within each pair were 3%, 13%, 1% and 0%. In addition, there was a good comparison between experimental and numerical data. The ratio of experimental to numerical buckling loads varies from

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Buckling of axially compressed CFRP cylinders with and without additional lateral load: Experimental and numerical investigation

Cited by 75 publications

References 16 publications

Buckling analysis of an imperfection-insensitive hybrid composite cylinder under axial compression – numerical simulation, destructive and non-destructive experimental testing

Buckling analysis of an imperfection-insensitive hybrid composite cylinder under axial compression – numerical simulation, destructive and non-destructive experimental testing

Probabilistic and deterministic lower-bound design benchmarks for cylindrical shells under axial compression

Instability of Conical Shells with Multiple Dimples under Axial Compression

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