Finite element simulation of the compressive response of additively manufactured lattice structures with large diameters

Guo, Honghu; Takezawa, Aikihiro; Honda, Masashi; Kawamura, Chikara; Kitamura, Mitsuru

doi:10.1016/j.commatsci.2020.109610

Cited by 60 publications

(29 citation statements)

References 29 publications

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“…1) The agglomeration of materials in the vicinity of the strut's connection points is usually accounted for by increasing the beam's diameter at the nodes by %20-40%. [20,69,130,131] As for a solid model, the actual node size and shape can be represented by a sphere of 20% larger diameter than the target struts. [132] 2) Experimentally derived geometric imperfections have been incorporated into a solid FE model by merging several spheres of various diameters and centroidal positions along the strut length.…”

Section: Implementation Of Defectsmentioning

confidence: 99%

A Review of the Selective Laser Melting Lattice Structures and Their Numerical Models

Alomar

Concli

2020

Adv Eng Mater

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Section: Implementation Of Defectsmentioning

confidence: 99%

A Review of the Selective Laser Melting Lattice Structures and Their Numerical Models

Alomar

Concli

2020

Adv Eng Mater

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“…[9][10][11][12][13][14][15][16] Lattice structures are periodic arrays that are designed by copying a unit cell that is repeated in space. 17,18 The unit cell is composed of rods or struts. Lattice structures represent a class of novel structures that can improve the load bearing performance with a reduction of weight.…”

Section: Introductionmentioning

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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“…In the last decade some effective strategies have been proposed for improving the computational efficiency of FE models of lattice structures [39,40,41]. Here an advanced mixed mesh strategy was applied, that was strongly based on the work of Guo et al [41].…”

Section: Lattice Structure and Specimen Designmentioning

confidence: 99%

“…Detail view of tetrahedral mesh (A), Timoshenko beam mesh (B) and expanded view of the beam mesh highlighting joint diameter oversizing based on[41] (C).…”

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confidence: 99%

Experimental study on the high-damping properties of metallic lattice structures obtained from SLM

Scalzo

Totis

Vaglio

et al. 2021

Precision Engineering

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Modern additive manufacturing technologies allow the creation of parts characterized by complex geometries that cannot be created using conventional production techniques. Among them the Selective Laser Melting (SLM) technique is very promising. By using SLM it is possible to create lightweight lattice structures that may fill void regions or partially replace bulk regions of a given mechanical component. As a consequence, the overall mechanical properties of the final component can be greatly enhanced, such as the resistance to weight ratio and its damping capacity against undesired vibrations or acoustic noise. Nevertheless, only a few research works focused on the characterization of the dynamic behaviour of lattice structures, that were mainly investigated in the low frequency range or directly tested on some specific applications. In this work the dynamic behaviour of lattice structures in the medium-high frequency range was experimentally investigated and then modelled. For this purpose, different types of lattice structures made of AlSi10Mg and AISI 316L were measured. Experimental modal analysis was performed on the obtained specimens in order to assess the influence of lattice material and unit cell geometry on their global dynamic behaviour. Experimental results revealed that lattice structures have superior damping characteristics compared to solid materials having an equivalent static stiffness. Eventually, the classic Rayleigh model was found to be adequate-with some approximation-to explain the damping behaviour of a generic lattice structure.

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Finite element simulation of the compressive response of additively manufactured lattice structures with large diameters

Cited by 60 publications

References 29 publications

A Review of the Selective Laser Melting Lattice Structures and Their Numerical Models

A Review of the Selective Laser Melting Lattice Structures and Their Numerical Models

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

Experimental study on the high-damping properties of metallic lattice structures obtained from SLM

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