Frequency-dependent orthotropic damping properties of Nomex honeycomb composites

Zhou, Yong; Liu, Anna; Xu, Yongzheng; Guo, Yuan; Yi, Xiaosu; Jia, Yuxi

doi:10.1016/j.tws.2020.107372

Cited by 10 publications

(4 citation statements)

References 24 publications

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“…Other types of frequency dependent dampers, refer to Kuo et al [28], Stollwitzer et al [29], Jith and Sarkar [30], Zhou et al [31], Zarraga et al [32], Xie et al [33,34], Hu et al [35], Rouleau et al [36], Hamdaoui et al [37], Deng et al [38], Dai et al [39], Adessina et al [40], Chang et al [41], Lin et al [42], Dai et al [43], Catania and Sorrentino [44,45], Zhang and Turner [46], Yoshida et al [47],…”

Section: Remarksmentioning

confidence: 99%

Analytical Theory of Fractional Vibrations

2024

Preprint

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This paper revisits the analytical theory of fractional vibrations with the highlights in five aspects. First, we address the cases of structures with frequency dependent mass or damping or stiffness in Sections 2-4. Second, we introduce the theory based on the general second-order vibration motion equation with frequency dependent elements (mass, damping, stiffness) in Sections 5-7. Third, we present the analytical theory of seven specific classes of second-order vibration systems with frequency dependent mass or damping or stiffness in Sections 8 and 9. Fourth, we bring forward the analytical theory of seven classes of fractional vibration systems in Sections 10-12. Finally, as an application, we give the closed form expression of the forced response to multi-fractional Euler-Bernoulli beam in Section 13. The explanation of the nonlinearity of fractional vibrations is given in Section 14.

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Section: Remarksmentioning

confidence: 99%

Analytical Theory of Fractional Vibrations

2024

Preprint

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“…Equation (1) can be written as, 20 Where h and b are the total thickness and width of the sandwich panel, respectively. The parameters h s and b s are the thickness and width of the face sheet, respectively; h c and b c are the thickness and width of the core, respectively.…”

Section: Theoretical Modelingmentioning

confidence: 99%

“…19 Also, as with other honeycomb cores, a Nomex core exhibits an anisotropic response. 7,20 It is often necessary to describe test sample data using statistical models, thereby accounting for the scatter in results due to manufacturing and scaling effects. 21 A Weibull statistical model is useful for predicting the experimental values as function of shape and scale parameters and a gamma function, based on the experimental dataset.…”

Section: Introductionmentioning

confidence: 99%

Influence of face sheet thickness on flexural strength characteristics of carbon/epoxy/Nomex honeycomb sandwich panels

Naresh

Alia

Cantwell

et al. 2023

Jnl of Sandwich Structures & Materials

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This study presents the findings of an investigation into the effect of varying the thickness of a carbon/epoxy face sheet of a Nomex honeycomb sandwich panel on its the flexural properties. The thickness (hs) of the face sheet was varied by increasing the number of plies from one 0.25 mm thick layer to eight such layers, giving a total nominal thickness of 2.0 mm, whilst maintaining a constant thickness of the core. The flexural properties of the sandwich panels were investigated through a series of three- and four-point bending tests. A particular focus was on identifying changes in the failure mode with increasing face sheet thickness. The flexural properties of the sandwich panels were predicted using sandwich beam theory, where the deviation from the experimental values was shown to be less than 13%. A two parameter Weibull distribution model was used to predict the maximum flexural load using an analysis of variance (ANOVA) tool and an excellent level of correlation was observed with the experimental values. The difference between the predicted maximum load values and the experimental results was below 5% in all cases. A brittle mode of failure was observed in the thickest panel. The sandwich panel based on 1.5 mm thick face sheet was identified as being the most appropriate design, both in terms of strength and stiffness.

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“…Aramid honeycomb, such as Nomex ® , whose mechanical properties show orthotropic anisotropy due to the unique close-packed hexagonal structure [1], is a porous material made of aramid fiber and phenolic resin [2]. It exhibits good performance, such as high specific strength, excellent flame retardancy, good corrosion resistance, and shock absorption [3], which makes it a promising core material for lightweight collision energy absorption structures in aerospace engineering like fairing, flap and hatch door, and in marine engineering like hull of racing boat and fireproof bulkhead [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Study on the Cutting Damage Mechanism of Aramid Honeycomb Based on the Progressive Damage Model

et al. 2022

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A progressive damage model for aramid honeycomb cutting was proposed to reveal its cutting damage mechanism. It established the relationship between the mesoscale failure modes and the macroscale cutting damage types of the aramid honeycomb. The proposed model addressed the material assignment problem of impregnated honeycomb by developing a material calculation method that simulates the real manufacturing process of the aramid honeycomb. Cutting experiment of aramid honeycomb specimen was conducted concerning on the cutting forces response and cutting damages, which validated that the proposed method was effective for investigating the cutting process and mechanism for the aramid honeycomb. Predicted cutting mechanism results show that: (a) cutting process of the aramid honeycomb can be divided into three stages with four characteristic states—initial state, cut-in state, cut-out state and final state; (b) cell wall bending in the cutting direction relieves the cutting force, and strong plasticity of the aramid fiber makes it hard to break, which lead to uncut fiber and burr damages; (c) using sharp tip cutting tool to reduce cutting force and bonding both top and bottom of the honeycomb to make it stiffer are beneficial to obtain good cutting quality with less damages.

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Frequency-dependent orthotropic damping properties of Nomex honeycomb composites

Cited by 10 publications

References 24 publications

Analytical Theory of Fractional Vibrations

Analytical Theory of Fractional Vibrations

Influence of face sheet thickness on flexural strength characteristics of carbon/epoxy/Nomex honeycomb sandwich panels

Study on the Cutting Damage Mechanism of Aramid Honeycomb Based on the Progressive Damage Model

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