Bioinspired structures for core sandwich composites produced by fused deposition modelling

Bru, J; Leite, Marco; Ribeiro, A. M. R.; Reis, L.; Deus, A.M.; Vaz, M. Fátima

doi:10.1177/1464420719886906

Cited by 14 publications

(9 citation statements)

References 37 publications

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“…In previous works, by the present authors, the value of 1.5 GPa was used for the Young's modulus. 1,44 However, the values presented in the literature are in a wide range, varying from 0.8-3.6 GPa for tensile tests, and from 2.2 to 4.5 GPa under bending conditions. 45 The elastic modulus determined in bending is higher than the one obtained for tensile tests.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of the effect of core lattice topology on the properties of sandwich panels produced by additive manufacturing

Monteiro

Sardinha

Alves

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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Sandwich structures are frequently used in automotive, aerospace and marine industries, as they provide adequate functional properties. The two-dimensional regular hexagonal cell shape, i.e. honeycomb is the most used core structure in sandwich panels. Recently, a new type of cellular structures composed of lattice struts has been proposed, as they combine high stiffness, strength and energy absorption with low weight. The main purpose of this research is to investigate the effect of the lattice topology on the flexural behaviour of sandwich panels. Five lattice geometries inspired in crystalline structures were designed, namely, body-centred parallelepiped, body-centred parallelepiped with struts in z-axis, body- and face-centred parallelepiped with struts in z-axis, face-centred parallelepiped with struts in z-axis and parallelepiped simple. The relative density of all the lattices was kept constant as 0.3. Both numerical and experimental approaches were used to evaluate the flexural properties and failure behaviour of the sandwich structures under three-point bending tests. The numerical analysis was undertaken with the finite element software NX Nastran. Taking advantage of additive manufacturing technologies, material extrusion was used to produce polylactic acid samples with the configurations aforementioned. The sandwich panels are composed by a single layer formed by the lattice core and two thin plates, at the bottom and top. The three parts of the panel were manufactured all together. The simulation results indicate that, among the lattices studied, topologies body-centred parallelepiped with struts in z-axis and body- and face-centred parallelepiped with struts in z-axis exhibit higher strength, while body- and face-centred parallelepiped with struts in z-axis shows higher stiffness and higher energy absorption, attaining values that do not differ much from the ones obtained with a two-dimensional hexagonal cellular structure, with the same relative density. As a consequence, some of the geometries studied may have the potential to be considered as alternatives to conventional structures in the design of sandwich structures.

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Section: Methodsmentioning

confidence: 99%

Evaluation of the effect of core lattice topology on the properties of sandwich panels produced by additive manufacturing

Monteiro

Sardinha

Alves

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part L:

Self Cite

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“…In biomedicine, biocompatible hydroxypropyl-methylcellulose-reinforced polylactide composites [46] and new bioinspired structures have been successfully printed by FDM [38,47]. Different types of PLA scaffolds [48][49][50] and non-toxic and biocompatible filaments of polylactic PLA-biphasic calcium phosphates composites obtained by hot melt extrusion (HME) were also shown to be suitable for FDM of scaffolds in the field of tissue engineering [51].…”

Section: Introductionmentioning

confidence: 99%

Fused deposition modelling: Current status, methodology, applications and future prospects

Cano-Vicent

Tambuwala

Hassan³

et al. 2021

Additive Manufacturing

199

126

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“…Universal testing machine Dak System Inc–series 7200 models no UTB-9103 is used to perform the tensile compression and shear test (Dak System Inc, 2021). Two influence factors first one is the type of the geometry (Enamel, Honeycomb and cylindrical) and the wall thickness (0.26, 0.33, 0.4 and 0.66 mm) are considered (Figure 1) (Bru et al , 2020). The enamel structure with a keyhole shape was developed according to the literature data (He and Swain, 2008).…”

Section: Methodsmentioning

confidence: 99%

Numerical investigations on mechanical properties of bio-inspired 3D printed geometries using multi-jet fusion process

Chand

Sharma

Trehan

et al. 2023

RPJ

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Purpose The purpose of this study is to find the best geometries among the cylindrical, enamel and honeycomb geometries based upon the mechanical properties (tensile test, compression test and shear test). Further this obtained geometry could be used to fabricate products like exoskeleton and its supporting members. Design/methodology/approach The present research focuses on the mechanical testing of cylindrical, enamel and honeycomb-shaped parts fabricated through multi-jet printing (MJP) process with a wall thickness of 0.26, 0.33, 0.4 and 0.66 mm. The polymer specimens (for tensile, compression and shear tests) were fabricated using a multi-jet fusion process. The experimental results were compared with the numerical modelling. Finally, the optimal geometry was obtained, and the influence of wall thicknesses on various mechanical properties (tensile, compression and shear) was studied. Findings In comparison to cylindrical, enamel structures the honeycomb structures required less time to fabricate and had lower tensile, compressive and shear strengths. The most efficient geometry for fully functional parts where tensile, compressive and shear forces are present during application – cylindrical geometry is preferred followed by enamel, and then honeycomb. It was found that as the wall thickness of various geometries was increased, their ability to withstand tensile, compressive and shear loads also enhanced. The enamel shape structure exhibits greater strain energy storage capacity than other shape structures for compressive loads, and the strength to resist the compressive load will be lower. In the case of cylindrical geometries for tensile loading, the resisting area toward the loading will be higher in comparison to honeycomb- and enamel-based structures. At the same time, the ability to store the stain energy is less. The results of the tensile, compression and shear load finite element analysis using ANSYS are in agreement with those of the experiments. Originality/value From the insight of literature review, it is found that a wide range of work is done on fused deposition modeling (FDM) process. But in comparison to FDM, the MJP provide the better dimensional accuracy and surface properties (Lee et al., 2020). Therefore, it is observed that past research works not incorporated the effect of wall thickness of the embedded geometries on mechanical properties of the part fabricated on MJP (Gibson, n.d.). Hence, in this work, effect of wall thickness on tensile, compression and shear strength is considered as the main factor for the honeycomb, enamel and cylindrical geometries.

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Bioinspired structures for core sandwich composites produced by fused deposition modelling

Cited by 14 publications

References 37 publications

Evaluation of the effect of core lattice topology on the properties of sandwich panels produced by additive manufacturing

Evaluation of the effect of core lattice topology on the properties of sandwich panels produced by additive manufacturing

Fused deposition modelling: Current status, methodology, applications and future prospects

Numerical investigations on mechanical properties of bio-inspired 3D printed geometries using multi-jet fusion process

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