Investigation of infill-patterns on mechanical response of 3D printed poly-lactic-acid

Aloyaydi, Bandar Abdullah; Sivasankaran, S.; Mustafa, Ammar

doi:10.1016/j.polymertesting.2020.106557

Cited by 100 publications

(40 citation statements)

References 34 publications

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“…Alayoldi, et al (2020) [68] investigated the effect of the infill pattern on the compressive strength of the part. It was found that triangular, grid and hexagonal infilled parts resulted in similar ultimate tensile strength (56)(57)(58)(59)(60)(61)(62)(63)(64)(65)(66)(67)(68)(69)(70)(71)(72), while the quarter cubic infill exhibited a significantly lower strength of 27 MPa. It was also found that the grid pattern had the highest tensile strength due to its special layer arrangement in which the infill layers are crisscrossed one above the other as shown in Figure 5.…”

Section: Effect Of Infill Patternsmentioning

confidence: 99%

“…Alayoldi, et al (2020) [ 68 ] investigated the effect of the infill pattern on the compressive strength of the part. It was found that triangular, grid and hexagonal infilled parts resulted in similar ultimate tensile strength (56–72 MPa), while the quarter cubic infill exhibited a significantly lower strength of 27 MPa.…”

Section: Influence Of Process Parameters On the Strength Of Fdm Partsmentioning

confidence: 99%

“… SEM images of various infill patterns: ( a ) Grid pattern; ( b ) Quarter cubic pattern; ( c ) Tri-hexagon pattern [ 68 ] (Alayaldi, et al (2019)). …”

Section: Figurementioning

confidence: 99%

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Optimisation of Strength Properties of FDM Printed Parts—A Critical Review

et al. 2021

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Additive Manufacturing is currently growing fast, especially fused deposition modeling (FDM), also known as fused filament fabrication (FFF). When manufacturing parts use FDM, there are two key parameters—strength of the part and dimensional accuracy—that need to be considered. Although FDM is a popular technology for fabricating prototypes with complex geometry and other part product with reduced cycle time, it is also limited by several drawbacks including inadequate mechanical properties and reduced dimensional accuracy. It is evident that part qualities are greatly influenced by the various process parameters, therefore an extensive review of the effects of the following process parameters was carried out: infill density, infill patterns, extrusion temperature, layer thickness, nozzle diameter, raster angle and build orientation on the mechanical properties. It was found from the literature that layer thickness is the most important factor among the studied ones. Although manipulation of process parameters makes significant differences in the quality and mechanical properties of the printed part, the ideal combination of parameters is challenging to achieve. Hence, this study also includes the influence of pre-processing of the printed part to improve the part strength and new research trends such as, vacuum-assisted FDM that has shown to improve the quality of the printing due to improved bonding between the layers. Advances in materials and technologies that are currently under development are presented. For example, the pre-deposition heating method, using an IR lamp of other technologies, shows a positive impact on the mechanical properties of the printed parts.

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Section: Effect Of Infill Patternsmentioning

confidence: 99%

“…Alayoldi, et al (2020) [ 68 ] investigated the effect of the infill pattern on the compressive strength of the part. It was found that triangular, grid and hexagonal infilled parts resulted in similar ultimate tensile strength (56–72 MPa), while the quarter cubic infill exhibited a significantly lower strength of 27 MPa.…”

Section: Influence Of Process Parameters On the Strength Of Fdm Partsmentioning

confidence: 99%

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Optimisation of Strength Properties of FDM Printed Parts—A Critical Review

et al. 2021

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“…It was proposed that the air gaps and shell values at 0 and 1 mm, respectively, resulted in improved mechanical properties [15]. the FFF process and consequently, these results in relatively porous structures with large gaps/voids between the strands [38]. In terms of yield stress, all three infill configurations yielded higher values as compared to the solid sample, and the largest value was found to be for the hexagonal infilled Furthermore, very recently, it was detected that various line pattern combinations and 100% density of the infill reduced the difference between the printed lines and resulted in an enhancement in adhesion of the bottom and top layers.…”

Section: Hexagonal Test Specimenmentioning

confidence: 99%

Evaluation of the Infill Design on the Tensile Response of 3D Printed Polylactic Acid Polymer

et al. 2021

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The current study explores the effects of geometrical shapes of the infills on the 3D printed polylactic acid (PLA) plastic on the tensile properties. For this purpose, by utilizing an accessible supply desktop printer, specimens of diamond, rectangular, and hexagonal infill patterns were produced using the fused filament fabrication (FFF) 3D printing technique. Additionally, solid samples were printed for comparison. The printed tensile test specimens were conducted at environmental temperature, Ta of 23 °C and crosshead speed, VC.H of 5 mm/min. Mainly, this study focuses on investigating the percentage infill with respect to the cross-sectional area of the investigated samples. The mechanical properties, i.e., modulus of toughness, ultimate tensile stress, yield stress, and percent elongation, were explored for each sample having a different geometrical infill design. The test outcomes for each pattern were systematically compared. To further validate the experimental results, a computer simulation using finite element analysis was also performed and contrasted with the experimental tensile tests. The experimental results mainly suggested a brittle behavior for solidly infilled specimen, while rectangular, diamond, and hexagonal infill patterns showed ductile-like behavior (fine size and texture of infills). This brittleness may be due to the relatively higher infill density results that led to the high bonding adhesion of the printed layers, and the size and thickness effects of the solid substrate. It made the solidly infilled specimen structure denser and brittle. Among all structures, hexagon geometrical infill showed relative improvement in the mechanical properties (highest ultimate tensile stress and modulus values 1759.4 MPa and 57.74 MPa, respectively) compared with other geometrical infills. Therefore, the geometrical infill effects play an important role in selecting the suitable mechanical property’s values in industrial applications.

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“…Recently, Aloyaydi et al (2020) conducted low velocity impact and compression tests on PLA specimens' 3D printed at different infill patterns: triangle, grid, quarter-cubic and tri-hexagon [14]. Their findings have shown that the grid pattern produced the highest compressive strength while the triangular pattern exhibited the highest absorbed energy in impact tests.…”

Section: Introductionmentioning

confidence: 99%

Insights into Mechanical and Thermal Properties of Additively Manufactured PLA Samples Triggered by Automotive Industry Demands

Motoc¹,

Drăghicescu²,

Florea³

et al. 2021

Mater. Plast.

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Paper explores the influence of the infill density (%), as a process parameter in additive manufacturing (3D printing), upon the mechanical (tensile, impact) and thermo-physical properties of PLA samples. The results indicated degradation of both tensile strengths and moduli with decrease of samples� relative density from 100% to 25% with 49.9% and 42.0%, respectively. Similar behaviour holds on impact strength values that degrades with 56.0% for the samples printed using a 25% infill density. The Young�s modulus variation with relative density values was approximated using a 3rd order polynomial function, in accordance with the expression for closed-cell thick edge rhombus cellular structures. All PLA samples revealed small difference on their coefficients of linear thermal expansion, irrespective of their infill densities, with a decrease of 6.34% in the lowest relative density value specimens, indicating enhanced stability within selected temperature range. Glass transition temperatures were approximately located at 65�C whereas cold-crystallization around 80�C, thus unaffected by selected process parameter.

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Investigation of infill-patterns on mechanical response of 3D printed poly-lactic-acid

Cited by 100 publications

References 34 publications

Optimisation of Strength Properties of FDM Printed Parts—A Critical Review

Optimisation of Strength Properties of FDM Printed Parts—A Critical Review

Evaluation of the Infill Design on the Tensile Response of 3D Printed Polylactic Acid Polymer

Insights into Mechanical and Thermal Properties of Additively Manufactured PLA Samples Triggered by Automotive Industry Demands

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