Effect of infill pattern, density and material type of 3D printed cubic structure under quasi-static loading:
01 Oct 2021-Vol. 235, Iss: 19, pp 0954406220971667
TL;DR: In this article, the effect of infill pattern, density and material types of 3D printed cubes under quasi-static axial compressive loading was investigated, and the proposed samples wer...
Abstract: The present research work is aimed to investigate the effect of infill pattern, density and material types of 3D printed cubes under quasi-static axial compressive loading. The proposed samples wer...
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TL;DR: In this article, the authors investigated the influence of 3D printing process parameters on the dimensional accuracy of specimens manufactured using Polylactic acid (PLA) material, and the results indicated the ability of commercial FDM 3D printers as an inexpensive and decent quality alternative for producing utilitarian parts.
48 citations
10 Mar 2021
TL;DR: In this paper, the influence of infill-patterns (IPs) on specific mechanical responses of parts fabricated by fused deposition modeling (FDM) was systematically investigated, where six types of infills (deposition angle), namely full honeycomb, rectilinear, triangular, fast honeycomb and grid, were designed and printed.
Abstract: This study aims to systematically experimental investigate the influence of infill-patterns (IPs) on specific mechanical responses of parts fabricated by fused deposition modeling (FDM). A poly-lactic-acid (PLA) feedstock filament is utilized in the manufacturing process. Furthermore, six types of infill-patterns (deposition angle), namely full honeycomb, rectilinear, triangular, fast honeycomb, grid, and wiggle, are designed and printed. In order to determine the mechanical properties of manufactured parts, tensile tests are carried out. The mechanical properties such as extension, stress, elongation, energy, and Young’s modulus are considered as objective functions. As a result, there is a direct correlation between mechanical properties and infill patterns. Thus, it is essential to select the best infill-pattern in terms of their applications, giving sufficient strength without overdoing time and cost. Based on the results, a triangular infill-pattern has a maximum value of ultimate tensile strength and E-module (15.4 and 534 MPa, respectively). On the other hand, the wiggle pattern is more flexible.
38 citations
Cites methods from "Effect of infill pattern, density a..."
...The grid and triangular are themost used pattern [24]....
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TL;DR: In this paper, the dimensional integrity, wall thickness accuracy, and surface roughness of different thin-walled geometrically shaped parts produced by 3D printers were determined under the conditions of three different geometries (square, round, and elliptical), three different wall thicknesses (1, 2, and 3 mm), and three different layer thicknesses.
Abstract: Advances in 3D printer technology are increasing rapidly, enabling the creation of many products. However, there are problems in ensuring dimensional integrity in parts produced using additive manufacturing. Dimensional integrity becomes even more important in the production of thin-walled parts, especially those used in the aerospace, aviation, and biomedical fields. For this reason, the production parameters should be controlled and the deviations from the actual dimensions minimized. This study was carried out under the conditions of three different geometries (square, round, and elliptical), three different wall thicknesses (1, 2, and 3 mm), and three different layer thicknesses (0.1, 0.2, and 0.3 mm). As a result of the study, the dimensional integrity, wall thickness accuracy, and surface roughness of different thin-walled geometrically shaped parts produced by 3D printer were determined. The highest dimensional accuracy was obtained in the square parts and the lowest in the round and elliptical parts. As the wall thickness was increased, the dimensional accuracy decreased, whereas the wall thickness accuracy increased. When the wall thickness was kept constant, as the layer thickness was increased, the dimensional accuracy increased, whereas the wall thickness accuracy decreased. Besides, the surface roughness was evaluated and it was determined that the layer thickness was the most important parameter affecting the surface quality of the samples. The starting point where the nozzle begins to form the layers and the gap formed between the wall layers were also determined to have an important effect on the geometric accuracy.
14 citations
TL;DR: In this article , a grey relational analysis was performed on six different patterned samples under ASTM D638 standard and the results showed that square patterned sample performed the best under tension and retained more mechanical strength than the other five patterns.
Abstract: In several engineering applications, the demand for robust yet lightweight materials have exponentially increased. Additive Manufacturing and 3D printing technology have the scope to make this possible at a fraction of the cost compared to traditional manufacturing techniques. Majority of the previous studies are focused mainly towards the printing parameters namely build orientation, infill density, and layer height etc. Also, most studies considered strength as an output response. However, when it comes to the cellular geometry and nozzle diameter, these parameters were found limited in the literature. Similarly, the combination of output responses such as stiffness, strength, toughness and resilience are found rarely in the previous studies. The current study is designed to capture the said gap in the literature with focus on cell geometry, nozzle diameter and strain rate by using the Taguchi design of experimentation and Grey Relational Analysis. Tensile test results performed on six different patterned samples under ASTM D638 standard suggest that square patterned samples perform the best under tension and retain more mechanical strength than the other five patterns. The grey relational analysis indicates that highest grey relational grade (GRG) was achieved for the larger nozzle diameter of 0.8 mm, strain rate of 5 mm per minute and square cellular geometry. It has been observed that highest contributing factor was nozzle diameter (48.99%), whereas cellular geometry was ranked second with (40.78%) as obtained from analysis of variance (ANOVA). The grey relational analysis simplified the complex 3D printing process optimization.
7 citations
TL;DR: In this article , the quasi-static response of biomimetic structures inspired by the horse hoof wall structure was investigated using a hemispherical indenter, where the intermediate layers of the laminated structures were filled with resin material in three different layer configurations with variable angles of 60°, 70° and 90°.
6 citations
References
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TL;DR: A new epoxy-based ink is reported, which enables 3D printing of lightweight cellular composites with controlled alignment of multiscale, high-aspectratio fiber reinforcement to create hierarchical structures inspired by balsa wood.
Abstract: A new epoxy-based ink is reported, which enables 3D printing of lightweight cellular composites with controlled alignment of multiscale, high-aspectratio fiber reinforcement to create hierarchical structures inspired by balsa wood. Young's modulus values up to 10 times higher than existing commercially available 3D-printed polymers are attainable, while comparable strength values are maintained.
1,269 citations
TL;DR: In this paper, the compressive properties of syntactic foam made by mechanical mixing of glass hollow spheres in epoxy resin matrix were characterized for compressive performance. But, the results were limited to a narrow range of compressive yield strength.
Abstract: Syntactic foam made by mechanical mixing of glass hollow spheres in epoxy resin matrix is characterized for compressive properties in the present study. Volume fraction of hollow spheres in the syntactic foam under investigation is kept at 67.8%. Effect of specimen aspect ratio on failure behavior and stress-strain curve of the material is highlighted. Considerable differences are noted in the macroscopic fracture features of the specimen and the stress-strain curve with the variation in specimen aspect ratio, although compressive yield strength values were within a narrow range. Post compression test scanning electron microscopic observations coupled with the macroscopic observations taken during the test helped in explaining the deviation in specimen behavior and in gathering support for the proposed arguments.
221 citations
TL;DR: In this paper, quasi-static energy absorption of six polymeric lattice structures of different unit cell topologies and deformation behaviors with identical relative density is investigated for the first time, a recently developed powerful 3D printing technology namely Multi Jet Fusion (MJF) is utilized to produce high quality and performance lattices.
192 citations
TL;DR: In this paper, the mechanical properties of polymeric gyroid-structure specimens made of PA 2200 at different relative densities were investigated both experimentally and computationally using finite element analysis.
191 citations
TL;DR: In this paper, a series of experimental investigations and numerical analyses are presented into the compression response, and subsequent failure modes in corrugated-core sandwich panels based on an aluminium alloy, a glass fibre reinforced plastic (GFRP), and a carbon fibre reinforced plastics (CFRP).
Abstract: A series of experimental investigations and numerical analyses is presented into the compression response, and subsequent failure modes in corrugated-core sandwich panels based on an aluminium alloy, a glass fibre reinforced plastic (GFRP) and a carbon fibre reinforced plastic (CFRP). The corrugated-cores were fabricated using a hot press moulding technique and then bonded to face sheets based on the same material, to produce a range of lightweight sandwich panels. The role of the number of unit cells and the thickness of the cell walls in determining the overall deformation and local collapse behaviour of the panels is investigated. The experiments also provide an insight into the post-failure response of the sandwich panels. The results are compared with the numerical predictions offered by a finite element analysis (FEA) as well as those associated with an analytical model. Buckling of the cell walls has been found to be initial failure mode in these corrugated systems. Continued loading resulted in fracture of the cell walls, localised delamination as well as debonding between the skins and the core. The predictions of the FEA generally show reasonably good agreement with the experimental measurements. Finally, the specific compressive properties of the corrugated structures have been compared to those of other core materials where evidence suggests that these systems compare favourably with their more conventional counterparts.
188 citations