Investigating the contribution of geometry on the failure of cellular core structures obtained by additive manufacturing

Araújo, Hugo F.; Leite, Marco; Ribeiro, Amr; Deus, A.M.; Reis, L.; Vaz, M. Fátima

doi:10.3221/igf-esis.49.45

Cited by 14 publications

(19 citation statements)

References 30 publications

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“…The arrangements studied, namely lotus (Lt), hexagonal honeycomb with Plateau borders (Pt), and hexagonal honeycomb (Hr) are illustrated in the schematics of Figure 1. These core designs were previously investigated under bending and compression by Ara ujo et al 7,39 However, the bending behavior of these structures designed with different in-plane orientations was not addressed. In the present work, inplane rectangular samples with three different angles between the axis of the cell, X, and the X 1 direction of Figure 1 were studied.…”

Section: Core Designmentioning

confidence: 99%

“…The parameters are scaled to the relative density, as in previous works. 7,39 Among the three structures, the Lt_0* configuration attains the highest values of stiffness and absorbed energy. However, the structure Hr_0* of aluminum-A sustains the highest maximum von Mises stress, i.e.…”

Section: Specimens Of Aluminum-amentioning

confidence: 99%

“…25,26 Several kinds of geometrical features of cellular cores have been proposed either for honeycomb type such as, square honeycomb-corrugation hybrid core, 27 or for the lattice structures upon a large variety of truss cores, 13,28,29 including pyramidal, 30 diamond cubic, 31,32 Kelvin and rhombicuboctahedron, 33 Kagome, 34,35 Voronoi-based arrangements, 36 and other structures inspired by atomic arrangements. 37,38 Recently, Ara ujo et al 7,39 adapted the configurations proposed by Ronan et al, 40 to the core of sandwich panels.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the influence of design in the mechanical properties of honeycomb cores used in composite panels

Miranda

Leite

Reis

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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The aerospace, automotive, and marine industries are heavily reliant on sandwich panels with cellular material cores. Although honeycombs with hexagonal cells are the most commonly used geometries as cores, recently there have been new alternatives in the design of lightweight structures. The present work aims to evaluate the mechanical properties of metallic and polymeric honeycomb structures, with configurations recently proposed and different in-plane orientations, produced by additive and subtractive manufacturing processes. Structures with configurations such as regular hexagonal honeycomb (Hr), lotus (Lt), and hexagonal honeycomb with Plateau borders (Pt), with 0°, 45°, and 90° orientations were analyzed. To evaluate its properties, three-point bending tests were performed, both experimentally and by numerical modeling, by means of the finite element method. Honeycombs of two aluminum alloys and polylactic acid were fabricated. The structures produced in aluminum were obtained either by selective laser melting technology or by machining, while polylactic acid structures were obtained by material extrusion using fused filament fabrication. From the stress distribution analysis and the load–displacement curves, it was possible to evaluate the strength, stiffness, and absorbed energy of the structures. Failure modes were also analyzed for polylactic acid honeycombs. In general, a strong correlation was observed between numerical and experimental results. The results show that the stiffness and absorbed energy increase in the order, Hr, Pt, Lt, and with the orientation through the sequence, 45°, 90°, 0°. Thus, Lt structures with 0° orientation seem to be good alternatives to the traditional honeycombs used in sandwich composite panels for those industrial applications where low weight, high stiffness, and large energy-absorbing capacity are required.

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Section: Core Designmentioning

confidence: 99%

Section: Specimens Of Aluminum-amentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of the influence of design in the mechanical properties of honeycomb cores used in composite panels

Miranda

Leite

Reis

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…The stress increased continuously and steeply until it reached the limit stress, which is called compaction. The initial compaction of the cellular metamaterial upon overstress represents the onset of cell wall interactions that increase the compression resistance of the cellular solid [ 47 , 48 ].…”

Section: Resultsmentioning

confidence: 99%

Mechanical Vibration Damping and Compression Properties of a Lattice Structure

et al. 2021

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The development of additive technology has made it possible to produce metamaterials with a regularly recurring structure, the properties of which can be controlled, predicted, and purposefully implemented into the core of components used in various industries. Therefore, knowing the properties and behavior of these structures is a very important aspect in their application in real practice from the aspects of safety and operational reliability. This article deals with the effect of cell size and volume ratio of a body-centered cubic (BCC) lattice structure made from Acrylonitrile Butadiene Styrene (ABS) plastic on mechanical vibration damping and compression properties. The samples were produced in three sizes of a basic cell and three volume ratios by the fused deposition modeling (FDM) technique. Vibration damping properties of the tested 3D-printed ABS samples were investigated under harmonic excitation at three employed inertial masses. The metamaterial behavior and response under compressive loading were studied under a uniaxial full range (up to failure) quasi-static compression test. Based on the experimental data, a correlation between the investigated ABS samples’ stiffness evaluated through both compressive stress and mechanical vibration damping can be found.

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“…These tendencies were previously observed. 26,39 The differences in values obtained numerically and experimentally may be attributed to the manufacturing process. The struts are formed by the external contours and an inner infill.…”

Section: Discussionmentioning

confidence: 99%

Bioinspired structures for core sandwich composites produced by fused deposition modelling

Bru

Leite

Ribeiro

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part L:

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Sandwich panels are widely used in many engineering applications where saving weight while maintaining high strength and stiffness is required. The most common core structure in sandwich panels is the two-dimensional regular hexagonal cell shape, denoted as Honeycomb. In recent times, bioinspired materials and structures have become increasingly attractive to researchers, as they provide adequate functional properties. The goal of the present work is to study two new bioinspired structures aimed at improving the performance of sandwich panel cores. Among all the large amount of structures that nature provides, two novel cores inspired in the structures of enamel and of bamboo were chosen. The compressive and flexural properties of these two innovative cellular structures were assessed and compared with the classic honeycomb. All the arrangements were numerically simulated for different relative densities. The fused deposition modelling technique enables to print selected samples in polylactic acid that were experimentally tested in compression and in bending. Results show that the mechanical properties depend strongly on the core geometry, on the relative density and on the cell thickness distribution. A satisfactory agreement was found between finite element results and experimental data. For the same relative density, the bioinspired natural structures proposed in the present study are potential competitors with the traditional core structures in what concerns strength, stiffness and energy absorption.

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Investigating the contribution of geometry on the failure of cellular core structures obtained by additive manufacturing

Cited by 14 publications

References 30 publications

Evaluation of the influence of design in the mechanical properties of honeycomb cores used in composite panels

Evaluation of the influence of design in the mechanical properties of honeycomb cores used in composite panels

Mechanical Vibration Damping and Compression Properties of a Lattice Structure

Bioinspired structures for core sandwich composites produced by fused deposition modelling

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