Numerical‐experimental structural instability analysis of composite tubes considering manufacturing parameters and imperfections

Gerhardt, Eduardo; Marczak, Rogério José; Amico, Sandro Campos

doi:10.1002/pc.25921

Cited by 3 publications

(3 citation statements)

References 28 publications

(35 reference statements)

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“…Gerhardt et al did numerical‐experimental instability analyses on filament‐wound rings and found a significant influence of imperfections (eigen buckling) on the mechanical stability during pressure tests. [ 18 ]…”

Section: State Of the Artmentioning

confidence: 99%

Impact of winding parameters on the fiber bandwidth in the cylindrical area of a hydrogen pressure vessel for generating a digital twin

et al. 2022

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The wet winding process is an established manufacturing technology for the production of rotationally symmetrical components made of fiber‐reinforced plastic (FRP), such as type‐IV hydrogen pressure vessels. In this process, the FRP laminate is produced by continuously depositing an impregnated fiber band on the winding core in a winding pattern adapted to the component stress. Despite a long history of the process, there are shortcomings in the understanding of the process, without which further optimization in terms of cost and material efficiency will reach its limits in the future. Currently, the fiber band is assumed to have a constant rectangular cross‐section in most simulations, which neglects manufacturing influences such as fiber spreading. The investigations carried out aim to extend the process understanding by a realistic description of the fiber bandwidth when deposited on the winding core. The investigations show that the fiber spreading, as well as the absolute fiber bandwidth, depend on the resin loading and the fiber band tension, independent of the winding pattern in the cylindrical area of a pressure vessel shaped winding core. In addition, the fiber bandwidth changes by 15%–20% during circumferential winding, depending on the machine movement.

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Section: State Of the Artmentioning

confidence: 99%

Impact of winding parameters on the fiber bandwidth in the cylindrical area of a hydrogen pressure vessel for generating a digital twin

et al. 2022

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“…Therefore, experimental studies are mostly appealed way to find post-buckling strength. [22][23][24][25][26][27][28] Experimental searches not only help to determine the crippling, but also it provides to specify the effecting parameters of the crippling strength and improve an understanding for the mechanics of the composite structures under the effect of compressive loads. In general, it is possible to gather the influential factors in three groups as geometrical effects, [29][30][31][32][33][34] material, [35][36][37][38][39] and boundary conditions.…”

Section: Introductionmentioning

confidence: 99%

“…However, it is impossible to express a direct relationship between extensional stiffness and bending stiffness for composites with only one equation. Therefore, experimental studies are mostly appealed way to find post‐buckling strength 22–28 …”

Section: Introductionmentioning

confidence: 99%

A new parameter to describe crippling strength: Experimental and theoretical investigations for post‐buckling behaviors of the composite structures

Yıldırım,

Ünal

2023

Polymer Composites

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The post‐buckling strength, which is simply called as crippling, is investigated for laminated composite structures in this study. L profiles that had various stacking sequences of carbon fiber reinforced epoxies were tested. Three different layups configurations were used by changing flange‐to‐thickness ratios. The main objective of this research was to show that flange‐to‐thickness ratio was not the only effecting parameter for crippling. Therefore, a new parameter, EGY number, was developed by considering the positions of 0° and 45° plies. Depending on EGY number, a new semi‐empirical formulation was presented to calculate crippling strength of the laminated composite structures. One of the test results was employed to verification of EGY number. In addition, the test results were validated with finite element analyses. Static, Riks and Dynamic, Explicit computational results were compared to simulate the experiments.Highlights Determination of crippling strength both experimentally and theoretically. Comparison of numerical models: Static, Riks versus Dynamic, Explicit. Developing a new parameter called as EGY number. Developing of a new analytical semi‐empirical formula for crippling strength.

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Sparse Polynomial Chaos Expansion for Uncertainty Quantification of Composite Cylindrical Shell with Geometrical and Material Uncertainty

Chen

Xin-hu

Shen

et al. 2022

JMSE

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The geometrical dimensions and mechanical properties of composite materials exhibit inherent variation and uncertainty in practical engineering. Uncertainties in geometrical dimensions and mechanical properties propagate to the structural performance of composite cylindrical shells under hydrostatic pressure. However, traditional methods for quantification of uncertainty, such as Monte Carlo simulation and the response surface method, are either time consuming with low convergence rates or unable to deal with high-dimensional problems. In this study, the quantification of the high-dimensional uncertainty of the critical buckling pressure of a composite cylindrical shell with geometrical and material uncertainties was investigated by means of sparse polynomial chaos expansion (PCE). With limited design samples, sparse PCE was built and validated for predictive accuracy. Statistical moments (mean and standard deviation) and global sensitivity analysis results were obtained based on the sparse PCE. The mean and standard deviation of critical buckling pressure were 3.5777 MPa and 0.3149 MPa, with a coefficient of variation of 8.801%. Global sensitivity analysis results from Sobol’ indices and the Morris method showed that the uncertainty of longitudinal modulus has a massive influence on the critical buckling pressure of composite cylindrical shell, whereas the uncertainties of transverse modulus, shear modulus, and Poisson’s ratio have a weak influence. When the coefficient of variation of ply thickness and orientation angle does not surpass 2%, the uncertainties of ply thickness and orientation angle have a weak influence on the critical buckling pressure. The study shows that the sparse PCE is effective at resolving the problem of high-dimensional uncertainty quantification of composite cylindrical shell with geometrical and material uncertainty.

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Numerical‐experimental structural instability analysis of composite tubes considering manufacturing parameters and imperfections

Cited by 3 publications

References 28 publications

Impact of winding parameters on the fiber bandwidth in the cylindrical area of a hydrogen pressure vessel for generating a digital twin

Impact of winding parameters on the fiber bandwidth in the cylindrical area of a hydrogen pressure vessel for generating a digital twin

A new parameter to describe crippling strength: Experimental and theoretical investigations for post‐buckling behaviors of the composite structures

Sparse Polynomial Chaos Expansion for Uncertainty Quantification of Composite Cylindrical Shell with Geometrical and Material Uncertainty

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