Mechanical properties of Nomex material and Nomex honeycomb structure

Foo, Chuan-Sheng; Chai, Gin Boay; Seah, Lay Hoon

doi:10.1016/j.compstruct.2006.07.010

Cited by 211 publications

(118 citation statements)

References 7 publications

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“…7. The test results are generally in agreement with those reported by other researchers [3,14], with a linear elastic region, a peak point, a "plateau" region and a densification region. It is well known that the initial peak of the load-displacement curve denotes the onset of plastic collapse of honeycombs in the out-of-plane compression tests.…”

Section: Out-of-plane Compression Responsesupporting

confidence: 82%

Experimental investigation on the yield behavior of Nomex honeycombs under combined shear-compression

Zhou

Wang

Zhao

et al. 2012

Lat. Am. j. solids struct.

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This paper presents an experimental investigation on the yield behavior of Nomex honeycombs under combined shearcompression with regard to out-of-plane direction. Four different types of specimens were designed in order to investigate the influence of in-plane orientation angle on the yield behavior of honeycombs under combined loads. Two different failure modes of honeycomb specimens, i.e. the plastic buckling and the extension fracture of cell walls, are observed under combined shear-compression. The experimental results validate that the in-plane orientation angle has a significant influence on the developments of the experimental yield surface. The experimental yield surfaces are compared with a phenomenological yield criterion capable of accounting for anisotropic behavior. The comparative analytical results indicate the experimental yield surfaces are approximately consistent with the theoretical yield surfaces in the normal-shear stress space. These experimental results are useful to develop constitutive models of Nomex honeycombs under combined shear-compression.

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Section: Out-of-plane Compression Responsesupporting

confidence: 82%

Experimental investigation on the yield behavior of Nomex honeycombs under combined shear-compression

Zhou

Wang

Zhao

et al. 2012

Lat. Am. j. solids struct.

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“…In particular, concerning the evaluation of the three out-of-plane moduli E 3 , G 13 and G 23 , the relative di erence between our model and [11,16] is very low:…”

Section: Comparison With Existing Analytical and Numerical Modelsmentioning

confidence: 99%

“…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

114

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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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“…Tsujii et al [41] did experimental work on this material. Foo et al [42] performed tension tests on the paper without the phenolic resin coating, showing that the Nomex paper by itself is similar to an orthotropic material that presents significant plastic behaviour and allows considerable strains before breaking. Plasticity starts at 24 MPa and 40 MPa in the transversal and fibre directions, respectively, and the paper breaks at strains of 0.13 and 0.15 in the transversal and fibre directions, respectively.…”

Section: Properties Of Nomex Papermentioning

confidence: 99%

Experimental and numerical analysis of the shear nonlinear behaviour of Nomex honeycomb core: Application to insert sizing

Rodríguez-Ramírez

Castanié

Bouvet

2018

Composite Structures

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numerical analysis of the shear nonlinear behaviour of Nomex honeycomb core: Application to insert sizing. Composite Structures, Elsevier, 2018, vol. 193, pp. 121-139. 10.1016/j.compstruct.2018 A B S T R A C TThis work is a contribution to the understanding of the nonlinear shear behaviour caused by cell postbuckling in Nomex honeycomb cores. First, an experimental benchmark study was made of different designs for the shear testing of honeycomb cores. Then, several test specimens were fabricated and tested, a 3D DIC system being used to measure and record the displacements. An Artificial Neural Network (ANN) was also used to identify the onset of bucking and collapse of the cells. The influence of the overall boundary conditions of shear tests on the buckling of the cells is presented both experimentally and numerically. The reversibility and test procedure results suggest that it may be possible to allow the shear strength to be increased by up to 35% under certain conditions.

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Mechanical properties of Nomex material and Nomex honeycomb structure

Cited by 211 publications

References 7 publications

Experimental investigation on the yield behavior of Nomex honeycombs under combined shear-compression

Experimental investigation on the yield behavior of Nomex honeycombs under combined shear-compression

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

Experimental and numerical analysis of the shear nonlinear behaviour of Nomex honeycomb core: Application to insert sizing

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