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In-plane and out-of-plane compressive mechanical properties of Nomex honeycombs and their prediction

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Abstract

Based on experiments used to evaluate the in-plane and out-of-plane mechanical properties of Nomex honeycomb, the influences of different cell geometries and honeycomb densities on the mechanical properties of honeycombs were investigated. The content of each component of honeycomb was analysed by disassembly. Furthermore, by introducing the wall thickness ratio and a correction function, a theoretical prediction model of out-of-plane mechanical properties was constructed. As for the prediction of in-plane mechanical properties, a three-layer structural finite element model of the cell walls was established through the use of a user-defined integration method.

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Abbreviations

d :

Cell size of Nomex honeycomb

\( t_{\text{s}} \), \( t_{\text{d}} \) :

Thickness of single and double cell walls

h :

Side length of the double cell wall

l :

Side length of the single cell wall

θ :

Cell wall angle of Nomex honeycomb

\( \sigma \), \( \varepsilon \) :

Compressive stress and strain of Nomex honeycomb

\( \sigma_{\text{c}} \), \( \varepsilon_{\text{c}} \) :

Collapse stress and strain of Nomex honeycomb

\( \sigma_{\text{p}} \) :

Plateau stress of Nomex honeycomb

\( \sigma_{\text{ci}} \), \( \sigma_{\text{pi}} \) :

Initial theoretical value of collapse stress and plateau stress

\( \sigma_{\text{cc}} \), \( \sigma_{\text{pc}} \) :

Corrected theoretical value of collapse stress and plateau stress

\( E_{\text{a}} \), \( E_{\text{m}} \) :

Energy absorption and specific energy absorption of Nomex honeycomb

\( \mu \) :

Residual rate of Nomex honeycomb

\( \rho_{\text{n}} \), \( S_{\text{n}} \) :

Equivalent density and cell area of Nomex honeycomb

\( \rho_{\text{a}}^{*} \), \( \rho_{\text{p}}^{*} \) :

Equivalent density of Nomex paper (without resin coating) and resin honeycomb

\( \rho_{\text{a}} \), \( \rho_{\text{p}} \) :

Density of Nomex paper (without resin coating) and resin

\( S_{\text{a}}^{*} \), \( S_{\text{p}}^{*} \) :

Cell area of Nomex paper (without resin coating) and resin honeycomb

\( S_{\text{a}} \), \( S_{\text{p}} \) :

Cell wall area of Nomex paper (without resin coating) and resin honeycomb

\( t_{\text{a}} \), \( t_{\text{p}} \) :

Wall thickness of Nomex paper (without resin coating) and resin honeycomb

p :

Wall thickness ratio

\( P_{\text{cs}} \), \( P_{\text{cd}} \) :

Collapse load of the single and double cell walls

\( E_{\text{s}} \) :

Young’s modulus of cell wall material

K :

End constraint factor

H :

Sample height

\( m \), \( n \) :

Half wave numbers in axial direction and transverse direction

C(x), G(x):

Correction function

\( Q_{1} \), \( Q_{2} \), \( Q_{3} \) :

Mechanisms of plastic deformation

\( M_{\text{s}} \), \( M_{\text{d}} \) :

Fully plastic bending moment of the single and double cell wall

\( 2\delta \) :

Wavelength of the folding mode

r :

Small radius of the toroidal shell

\( \sigma_{\text{ys}} \) :

Yield strength of honeycomb wall

\( P_{\text{m}} \) :

Plateau force

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Acknowledgements

This research was undertaken at Key Laboratory of Traffic Safety on Track (Central South University), Ministry of Education, China. The authors gratefully acknowledge the support from the National Natural Science Foundation of China (Grant No. 51775558). This paper also supported by Innovation-Driven Program of the Central South University (No. 2018CX023), the Nature Science Foundation for Excellent Youth Scholars of Hunan Province (Grant No. 2019JJ30034) and the Shenghua Yu-ying Talents Program of the Central South University (Principle Investigator: Pro. Suchao Xie).

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Xie, S., Feng, Z., Zhou, H. et al. In-plane and out-of-plane compressive mechanical properties of Nomex honeycombs and their prediction. J Braz. Soc. Mech. Sci. Eng. 42, 460 (2020). https://doi.org/10.1007/s40430-020-02550-9

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