Numerical and experimental analyses of modal frequency and damping in tow-steered CFRP laminates

Pereira, Daniel A.; Guimarães, Thiago A.; Resende, Hugo; Rade, Domingos A.

doi:10.1016/j.compstruct.2020.112190

Cited by 26 publications

(8 citation statements)

References 31 publications

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“…Railway cars are usually subjected to cyclic loads for a long time period during operation, resulting in the gradual degradation of strength attenuation and stiffness for the floor of the railcar. The fatigue failure possibly becomes one of the main damage forms. − The fatigue failure times of the WBLC at different stress levels are shown in Figure S13b. The WBLC exhibited increasing fatigue failure times with the decrease of the stress.…”

Section: Resultsmentioning

confidence: 99%

Bamboo-Inspired Renewable, Lightweight, and Vibration-Damping Laminated Structural Materials for the Floor of a Railroad Car

Han

Chen

Yu³

et al. 2022

ACS Appl. Mater. Interfaces

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It is important for the floor of railroad cars to be fitted with vibration- and noise-reducing, fire-resistant, and durable materials. In this study, inspired by a delicate and ordered bamboo gradient structure and excellent multilevel interfaces, we fabricated a laminated composite with characteristics similar to those of the bamboo structure using a simple and effective “top-down” method by laminating fast-growing wood, waste rubber, and bamboo charcoal plastic sheets made of bamboo processing residues. This composite material combines the unique advantages of a laminated structure design and composite interface bionics. The low density (0.73 g/cm3) of the laminated composite results in a specific modulus of 13.03 GPa cm3/g, a vibration damping ratio of 6.61%, and an impact toughness of 14.16 J/cm2, which is significantly higher than that of other wood-based composites used for high-speed rail floors, such as Birch plywood (BP). In addition, we also investigated the laminated composite bonding property, fire resistance, and fatigue performance. This biomimetic bamboo–wood composite material has great potential for application in fitting the floor of eco-friendly railway cars.

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Section: Resultsmentioning

confidence: 99%

Bamboo-Inspired Renewable, Lightweight, and Vibration-Damping Laminated Structural Materials for the Floor of a Railroad Car

Han

Chen

Yu³

et al. 2022

ACS Appl. Mater. Interfaces

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“…Honda et al [4] considered splines to represent the fiber paths of curvilinear fibers. Honda et al [5] developed a multi-objective approach in order to maximize both fundamental frequencies and in-plane strengths of VAT plates, while Pereira et al [6] performed a multi-objective optimization considering the fundamental frequency and the first mode specific damping capacity (SDC). Serhat et al [7], also maximized the fundamental frequency of variable stiffness panels but proposing a more efficient method to design variable stiffness composite panels using lamination parameters.…”

Section: Introductionmentioning

confidence: 99%

Fundamental Frequency Optimization of Variable Angle Tow Laminates with Embedded Gap Defects

2022

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Variable stiffness composite laminates can improve the structural performance of composite structures by expanding the design space. This work explores the application of variable stiffness laminated composite structures to maximize the fundamental frequency by optimizing the tow angle. To this end, an optimization framework is developed to design the fiber angle for each layer based on the maximization of the fundamental frequency. It is assumed that the design process includes the manufacturing constraints encountered in the automated fiber placement process and a linear fiber angle variation. The current study improves existing results by considering embedded gap defects within the optimization framework. The plates are assumed symmetric, with clamped and simply supported boundary conditions. The optimal results and a comparison between the non-steered and steered plates with and without gaps are presented. Results show that, although gaps deteriorate the structural performance, fiber steering can still lead to an increase in the fundamental frequency depending on the plate’s geometry and boundary conditions.

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“…Then, the effect of structural factor (cell side length) is studied to further reveal the damping mechanism. Inspired by the studies of obtaining the relative high damping properties of laminated composites through adjusting the fiber orientation [11], the potential application value of orthotropic damping properties of honeycomb cores in the obtaining of relative high structure-damping performance of honeycomb sandwich composites deserve further study. Therefore, the effect of beam orientation on the anisotropic damping properties of honeycomb sandwich structure is explored based on the verified TSM and damping coefficients of the honeycomb core at last.…”

Section: Introductionmentioning

confidence: 99%

Frequency-dependent orthotropic damping properties of Nomex honeycomb composites

Zhou

Liu

et al. 2021

Thin-Walled Structures

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In this paper, the orthotropic damping behavior of Nomex honeycomb composites and its causes are investigated. The needed specimen sizes for the measurement of the frequency-dependent transverse shear moduli (TSM) and fundamental damping coefficients of the honeycomb cores were analyzed at first. Then, the effects of cell side length and beam orientation on the orthotropic damping properties were explored. The results reveal that relatively high TSM (GLT) and damping values (ηWT) can be obtained by decreasing the cell side length without adding any additional weight. Damping mechanism analysis indicates that the difference in damping contribution of the interfacial phase to honeycomb core in different directions leads to the orthotropic damping behavior of honeycomb core. This study is helpful to guide the TSM measurement and structure design of honeycomb composites.

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Numerical and experimental analyses of modal frequency and damping in tow-steered CFRP laminates

Cited by 26 publications

References 31 publications

Bamboo-Inspired Renewable, Lightweight, and Vibration-Damping Laminated Structural Materials for the Floor of a Railroad Car

Bamboo-Inspired Renewable, Lightweight, and Vibration-Damping Laminated Structural Materials for the Floor of a Railroad Car

Fundamental Frequency Optimization of Variable Angle Tow Laminates with Embedded Gap Defects

Frequency-dependent orthotropic damping properties of Nomex honeycomb composites

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