Dynamic behaviour of auxetic gradient composite hexagonal honeycombs

Abstract

The paper describes a vibroacoustics analysis of auxetic gradient honeycomb composite structures with hexagonal configurations. We examine two classes of gradient cellular layout-one with continuously varying internal cell angle, the other with gradient cell wall aspect ratio across the surface of the honeycomb panel. The structural dynamics behaviour of the two gradient honeycomb configurations is simulated using full-scale Finite Elements and Component Mode Synthesis (CMS) substructuring. Samples of the gradient honeycombs have been manufactured by means of 3D printing techniques, and subjected to modal analysis using scanning laser vibrometry. We observe a general good comparison between the numerical and the experimental results. A numerical parametric analysis shows the effect of the gradient topology upon the average mobility and general vibroacoustics response of these particular cellular structures.

Enhancement of Lightweight Composite Parts with Robust Cellular Structures by Combining Fused Deposition Modeling and Electromagnetic Induction Heating

“…The core materials in the sandwich structures are key to improve rigidity and reduce the weight of the entire structures . In fact, the core materials are like the web of the joist steel which is a kind of lightweight clapboard between wing plates . When loaded, the wing plates are subjected to the main tension and pressure, so the web can be relatively light.…”

Multilayered Equivalent Finite Element Method for Embedded Honeycomb Plates

“…e influence of cell size on modes 3, 4, and 5 is greater than that on modes 1 and 2 [27][28][29]. is is because modes 1 and 2 mainly show bending deformation, and modes 3, 4, and 5 are telescopic and torsional (Figure 9).…”

“…Because the embedded part of the plate is nonuniform, the value varies depending on the selected part. However, Equation (27) shows that although the integral value is different, it is a constant integral to x. en, constants G 1 and G 2 are used:…”

Simplified Design Equations for a Class of Rhombic Auxetic Plates

“…A number of auxetic materials applications have been suggested; interested readers are referred to related reviews [4][5][6] and a monograph [7] for further details of such materials. Investigations into the performance of plates with the use of auxetic materials have been carried out [8][9][10][11]. Although studies on auxetic plates have been done on rectangular [12][13][14], circular [15][16][17], triangular [18][19][20], elliptical [21], sectorial [22], hexagonal [23] and regular polygonal [24] plates-no work has been done on auxetic rhombic plates.…”