Investigation of torsional properties of surface- and strut-based lattice structures manufactured using multiJet fusion technology

Hailu, Yeabsra Mekdim; Nazir, Aamer; Hsu, Chi-Pin; Lin, Shang-Chih; Jeng, Jeng-Ywan

doi:10.1007/s00170-022-08681-8

Cited by 7 publications

(6 citation statements)

References 26 publications

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“…AM, to which 3D printing technologies belong, consists of a wide range of techniques with sufficient similarities and differences. The most popular techniques, either commercially or academically, are fused filament fabrication (FFF) [ 10 – 12 ], stereolithography (SLA) [ 13 – 15 ], selective laser sintering (SLS) [ 16 – 18 ], MultiJet Fusion (MJF) [ 19 – 21 ], selective laser melting (SLM) [ 22 – 24 ], and wire arc additive manufacturing (WAAM) [ 25 – 27 ], among others. Their differences are related to their operating principle and raw materials’ form, but according to the ISO/ASTM 52,900–15 [ 28 ] standard, all these techniques are described through the “process of joining material to make parts from 3D model data, usually layer upon layer, as opposed to subtractive manufacturing and formative manufacturing methodologies”.…”

Section: Introductionmentioning

confidence: 99%

Mechanical response assessment of antibacterial PA12/TiO2 3D printed parts: parameters optimization through artificial neural networks modeling

Vidakis

Petousis

Mountakis

et al. 2022

Int J Adv Manuf Technol

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This study investigates the mechanical response of antibacterial PA12/TiO 2 nanocomposite 3D printed specimens by varying the TiO 2 loading in the filament, raster deposition angle, and nozzle temperature. The prediction of the antibacterial and mechanical performance of such nanocomposites is a challenging field, especially nowadays with the covid-19 pandemic dilemma. The experimental work in this study utilizes a fully factorial design approach to analyze the effect of three parameters on the mechanical response of 3D printed components. Therefore, all combinations of these three parameters were tested, resulting in twenty-seven independent experiments, in which each combination was repeated three times (a total of eighty-one experiments). The antibacterial performance of the fabricated PA12/TiO 2 nanocomposite materials was confirmed, and regression and arithmetic artificial neural network (ANN) models were developed and validated for mechanical response prediction. The analysis of the results showed that an increase in the TiO 2 % loading decreased the mechanical responses but increased the antibacterial performance of the nanocomposites. In addition, higher nozzle temperatures and zero deposition angles optimize the mechanical performance of all TiO 2 % nanocomposites. Independent experiments evaluated the proposed models with mean absolute percentage errors (MAPE) similar to the ANN models. These findings and the interaction charts show a strong interaction between the studied parameters. Therefore, the authors propose the improvement of predictions by utilizing artificial neural network models and genetic algorithms as future work and the spreading of the experimental area with extra variable parameters and levels.

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Section: Introductionmentioning

confidence: 99%

Mechanical response assessment of antibacterial PA12/TiO2 3D printed parts: parameters optimization through artificial neural networks modeling

Vidakis

Petousis

Mountakis

et al. 2022

Int J Adv Manuf Technol

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“…It is thought that this is due to the fact that the models produced are not filled cylinders, as is the case in the literature, and are caused by microcracks caused by the small pores on the surface of the models. 7 When the torsional yield strength is exceeded, the relationship between the torque value and the torsion angle ceases to be linear and the shear stress distribution from the center axis of the models towards the surface becomes non-linear. 39 Torsional moment loading is complex compared to compressive and tensile loads because the direction of the load is constantly changing as the load is applied.…”

Section: Discussion and Resultsmentioning

confidence: 99%

“…Experimental results showed that gyroid structures have superior torsional stiffness, energy absorption capacity compared to vertically inclined structure. 7 Mittag et al conducted studies that torsional load is one of the important load components and found that tubular closed structures have strong strength during torsion. 8 In a similar way Concli et al performed several micro-scale simulations, including torsion, to fully understand the response of cells exposed to different loading conditions, in addition to compression testing to investigate the ductile behavior of rigid structures.…”

Section: Introductionmentioning

confidence: 99%

Mechanical characterization of lattice structure produced by additive manufacturing under torsion and compression

Akbay,

Özdemir,

Bahçe

et al. 2023

Journal of Cellular Plastics

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In the present paper, the torsion and compression behaviors of lattice structures were studied. The PLA (Polylactic Acid) materials were used in assembly and produced by additive manufacturing method. The structure and lattice behaviors were investigated by Digital Image Correlation (DIC) system during experimental study. Models created using three different unit cell model as Trunch Octa Dense, Trunch Octa Light, Body Diagonals With Nodes and two different, 70 mm and 140 mm, total length size. The influence of the unit cell model, cell size on the strength of the structure were studied by compression and torsion experiments. The maximum compressive stress and maximum torsion were obtained and their deformations were presented. The highest maximum torque was determined in Body Diagonals With Nodes cell model and 140 mm due to the fact that the cell model structure compatible with torsion. The highest compressive stress was determined in Trunch Octa Light cell model and 140 mm cell length.

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“…In comparison to primitive structures and vertically slanted structures, gyroid structures have higher torsional rigidity. 24 Gyroid unit cells can typically be created using a surface-based implicit function ((x, y, z) = t), where t controls the offset from the level sets and can change depending on the design domain. The control equation for the gyroid surface is…”

Section: Tpms-based Gyroid Lattice Structures Design and Characteriza...mentioning

confidence: 99%

“…In comparison to primitive structures and vertically slanted structures, gyroid structures have higher torsional rigidity. 24…”

Section: Introductionmentioning

confidence: 99%

Uniform and graded bio-inspired gyroid lattice: Effects of post-curing and print orientation on mechanical property

Chouhan,

Bala Murali

2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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Additive manufacturing is spreading rapidly because it offers great design freedom in creating intricate lightweight shapes using lattice structures that offer numerous possibilities, including applications in aerospace, automotive, and electronics where mechanical properties are paramount. In this paper, inspired by the wing scale of the C. Rubi butterfly, unique uniform and density-graded gyroid lattice structures were proposed. This research designed the uniform gyroid lattice structure with two design configurations of unit cell sizes (4, 6, and 8) and solidity percentages (20, 30, 40, and 50) and density-graded gyroid with a solidity range of 20–80% in a constant volume of 30*30*30 mm. The designs have been modeled in nTopology software and manufactured using the Vat polymerization additive manufacturing technique with two printing orientations (0° and 25°). Two sets of the samples were printed, and one group was given postcuring treatment at 80°C for 2 hours. Quasi-static compression testing was performed to investigate the improvement in mechanical characteristics due to postcuring treatment and print orientation. The results indicate significant relationships between design parameters and mechanical performance. The density-graded gyroid lattice exhibits four times higher compressive strength than higher solidity uniform gyroid samples (UC-8-solidity-40 and 50%) when subjected to the same or less mass. In addition, debonding of connecting surfaces due to higher postcuring temperature, and better performance of horizontally printed samples have been addressed. Moreover, simulation and experimental deformation patterns for uniform and graded gyroid lattice structures have been displayed.

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Investigation of torsional properties of surface- and strut-based lattice structures manufactured using multiJet fusion technology

Cited by 7 publications

References 26 publications

Mechanical response assessment of antibacterial PA12/TiO2 3D printed parts: parameters optimization through artificial neural networks modeling

Mechanical response assessment of antibacterial PA12/TiO2 3D printed parts: parameters optimization through artificial neural networks modeling

Mechanical characterization of lattice structure produced by additive manufacturing under torsion and compression

Uniform and graded bio-inspired gyroid lattice: Effects of post-curing and print orientation on mechanical property

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