Comparative study on the tensile performance of box frames constructed by keyed joints and dovetail joints

The top and bottom shells of fused deposition 3D-printed PLA models are exposed to the highest stresses. To improve the bending performance of PLA models under three-point bending conditions, the models were strengthened by a selective enhancement method. Several sets of PLA models were fabricated using FDM technology, and three-point bending experiments were conducted to compare the bending strength of PLA models when the layer height, top/bottom shell thickness, and extrusion rate were varied. The bending strength of the PLA models increased as the layer height of the top/bottom shell decreased, the thickness increased, and the extrusion rate increased. The average bending strength of the PLA models after selective enhancement was 84.4 MPa, and the average bending modulus of elasticity was 0.816 GPa, which were higher than the average bending strength of 68.6 MPa and the average bending modulus of elasticity of 0.736 GPa of the conventional groups. These results indicated that the selective enhancement method improved the bending performance of 3D-printed PLA models, and it also provided a reference for the improvement of the mechanical properties of the 3D-printed models with cellulose composite reinforced materials.

Section: Effect Of Top/bottom Shell Thickness On Bending Performance ...mentioning

confidence: 99%

Effect of selective enhancement on the bending performance of fused deposition methods 3D-printed PLA models

Wang,

Yu,

Jiang

et al. 2024

“…The bulging deformation causes shear stresses to be generated at the interlayer adhesive interface where the bonding force is weak. Under the influence of shear stress, the grooves and gaps are prone to stress concentration and lead to the cracking of the interlayer adhesive interface (Wang et al 2020). The microscopic morphology of the layer separation region is shown in Fig.…”

Section: Effect Of Immersion Polishing On the Mechanical Performance ...mentioning

confidence: 99%

Immersion polishing post-treatment of PLA 3D printed formed parts on its surface and mechanical performance

Wang,

Zhang,

Ding

et al. 2023

Steps were taken to improve the surface and mechanical performance of PLA 3D printed formed parts, reduce the “step texture” produced by the fused deposition process, and improve the quality of 3D printing by means of post-treatment. The PLA 3D formed parts were immersion polished with chloroform solution to investigate the effects of immersion polishing on the surface roughness, surface gloss, mechanical properties, and other factors of PLA formed parts. The results of the pre-experiment showed that 90% of the effect was due to the optimal concentration value of chloroform solution and 10% was the optimization of time for immersion polishing. Under the pre-experimental conditions, the surface roughness of the formed parts was reduced by 87%, and the surface gloss was increased by 510%, the surface quality and gloss were significantly improved, and the “step texture” was significantly reduced; meanwhile, the tensile and compressive ultimate strength of the formed parts were increased by 9.41% and 13.09%, respectively, and the mechanical performance were improved, and the quality of 3D printing post-treatment was significantly improved.

“…The PETG filament is one of the few bio-based 3D printing consumables with high toughness, impact strength, that is basically odorless when printing, and exhibits excellent processing and moulding performances, with a broad application prospect in the field of 3D printing (Wang et al 2020). In actual production, PETG products manufactured by conventional moulding methods, such as extrusion moulding, injection moulding, and blow moulding, usually have excellent light transmittance performance, whereas PETG products produced by the fused deposition method (FDM) of 3D printing process have poor light transmittance performance (Yang et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Effect of slicing parameters on the light transmittance of 3D-printed polyethylene terephthalate glycol products

Wang,

Yu,

Jiang

et al. 2023

To manufacture 3D-printed polyethylene terephthalate glycol (PETG) products with excellent light transmittance performance, this study evaluated the principle of light transmission and the influencing factors of fused deposition methods (FDM) 3D-printed PETG products. This study explored the influence of different slicing parameters (layer height, extrusion rate, and printing speed) on the light transmittance of PETG products via a UV-visible spectrophotometer. The results showed that, in the range of 0.1 to 0.3 mm, the PETG specimens with 0.2 mm layer height had the best light transmittance performance; in the range of 100% to 120%; the PETG specimens with 110% extrusion rate had the best light transmittance performance; in the range of 20 to 40 mm/s printing speed, the PETG specimens with 40 mm/s printing speed had the best light transmittance performance. Comparison of image visibility showed that PETG products with layer height of 0.2 mm, extrusion rate of 110%, and printing speed of 40 mm/s had the best image visibility.