Experimental studies on mechanical properties of cellular structures using Nomex® honeycomb cores

Karakoç, Alp; Freund, Jouni

doi:10.1016/j.compstruct.2012.01.024

Cited by 57 publications

(30 citation statements)

References 15 publications

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“…(A.3)-(A.8)) are compared with those of Gibson and Ashby (1997) as well as experimental data (Hexcel Corporation, 1999;Karakoc and Freund, 2012) for both inplane and out-of-plane moduli in Figs. 15 and 16, respectively.…”

Section: Honeycombs With Double Thickness Vertical Cell Wallsmentioning

confidence: 99%

Effective elastic properties of periodic hexagonal honeycombs

Malek

Gibson

2015

Mechanics of Materials

198

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We investigate the elastic behaviour of periodic hexagonal honeycombs over a wide range of relative densities and cell geometries, using both analytical and numerical approaches. Previous modelling approaches are reviewed and their limitations identified. More accurate estimates of all nine elastic constants are obtained by modifying the analysis of Gibson and Ashby (1997) to account for the nodes at the intersection of the vertical and inclined members. The effect of the nodes becomes significant at high relative densities. We then compare the new analytical equations with previous analytical models, with a numerical analysis based on a computational homogenization technique and with data for rubber honeycombs over a wide range of relative densities and cell geometries. The comparisons show that both the new analytical equations and numerical solutions give a remarkably good description of the data. The results provide new insights into understanding the mechanics of honeycombs and designing new cellular materials in the future.

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Section: Honeycombs With Double Thickness Vertical Cell Wallsmentioning

confidence: 99%

Effective elastic properties of periodic hexagonal honeycombs

Malek

Gibson

2015

Mechanics of Materials

198

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“…We can also nd other works where the e ective properties of the sandwich plate are determined via FE static analyses conducted on the overall geometry of the honeycomb core instead of performing an homogenisation process on the unit cell, see for instance [22]. Further interesting works on purely experimental or mixed numerical/experimental techniques for the determination of the e ective properties of the honeycomb core can be found in [13,18].…”

mentioning

confidence: 99%

A multi-scale approach for the optimum design of sandwich plates with honeycomb core. Part I: homogenisation of core properties

Catapano

Montemurro

2014

Composite Structures

115

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This work deals with the problem of the optimum design of a sandwich panel. The design process is based on a general two-level optimisation strategy involving di erent scales: the meso-scale for both the unit cell of the core and the constitutive layer of the laminated skins and the macro scale for the whole panel. Concerning the meso-scale of the honeycomb core, an appropriate model of the unit cell able to properly provide its e ective elastic properties (to be used at the macro-scale) must be conceived. To this purpose, in this rst paper, we present the numerical homogenisation technique as well as the related nite element model of the unit cell which makes use of solid elements instead of the usual shell ones. A numerical study to determine the e ective properties of the honeycomb along with a comparison with existing models and a sensitive analysis in terms of the geometric parameters of the unit cell have been conducted. Numerical results show that shell-based models are no longer adapted to evaluate the core properties, mostly in the context of an optimisation procedure where the parameters of the unit cell can get values that go beyond the limits imposed by a 2D model.

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“…3, multipoint constraints are represented for the opposing boundaries along X-direction. Then, macroscopic (effective) compliance M C was obtained from the relationship between the given macroscopic infinitesimal strain M e and computed macroscopic stress M s so that [19,20] .…”

Section: Mechanical Modelmentioning

confidence: 99%

A fiber network model to understand the effects of fiber length and height on the deformation of fibrous materials

Karakoç

2016

Res. Eng. Struct. Mat.

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Fiber networks, in which the natural or artificial fibers are randomly or directionally aligned and bonded together through a chemical, mechanical and/or thermal processes, form the structural foundations for fibrous materials such as nonwoven fabrics, paper and paperboards. Fiber network deformation plays critical role in determining the mechanical properties of such materials. Therefore, there have been extensive efforts to generate fiber network models in two and three dimensional space. As a contribution to the modelling efforts, a fiber network model is introduced in the present study. The main goal is to understand the microstructural parameters including fiber length and crosssection affecting the fiber network deformation and compute the mechanical properties of the aggregate. The present numerical advancement is believed to guide researchers and designers to analyze fiber network characteristics more efficiently and in shorter time spans.

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Experimental studies on mechanical properties of cellular structures using Nomex® honeycomb cores

Cited by 57 publications

References 15 publications

Effective elastic properties of periodic hexagonal honeycombs

Effective elastic properties of periodic hexagonal honeycombs

A multi-scale approach for the optimum design of sandwich plates with honeycomb core. Part I: homogenisation of core properties

A fiber network model to understand the effects of fiber length and height on the deformation of fibrous materials

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