Tensile Behaviour of PLA Parts Manufactured by FFF with Defects in the Interlayer Filament Bonding and its Application in Product Design

Abstract:

Additive Manufacturing (AM) has been one of the technologies that has been booming in recent years. Its main advantages are the versatility in the manufacture of parts, the ability to print limited series and its low acquisition cost, among others. Among these technologies, one of the most widely used by engineering and product design teams is Fused Filament Fabrication (FFF). PLA being one of the materials most employed for FFF. Likewise, for a proper shaping of this material and process, it is necessary to establish several parameters to define the quality and properties of the designed part. In this context, a comparison of two groups of pieces has been carried out. Whereas the first group exhibits a correct process parameters and an adequate calibration of the printing bed; the second, has not any bonding between layers or bonding of beads of the same layer, due to an incorrect establishment of the initial parameters. In order to compare these groups, a study of the internal structure was carried out by X-Ray CT along with a characterization of their tensile mechanical properties. Results show a similar maximum stress for both groups, but a drastic reduction of the plastic area in the parts with defects. The quantification and comparison of the mechanical properties of both tests might provide a rejection criterion for parts that work in tension and present defects similar to those studied for engineering teams in product design.

• Periodical: Key Engineering Materials (Volume 956)
• Pages: 179-188
• DOI: https://doi.org/10.4028/p-WDOd0M
• Online since: September 2023
• Authors: Miguel Ángel Pardo-Vicente*, Daniel Moreno Nieto, Daniel Moreno-Sanchez, Pablo Pavón-Domínguez, Miriam Herrera-Collado
• Keywords: Additive Manufacturing, Fused Filament Fabrication (FFF), Interlayer Filament Bonding, Overlap, PLA, Product Design

References

[1] Jones, R., Haufe, P., Sells, E., Iravani, P., Olliver, V., Palmer, C., & Bowyer, A. (2011). RepRap – the replicating rapid prototyper. Robotica, 29(01), 177–191

DOI: 10.1017/S026357471000069X

[2] Labs | FabLabs. (n.d.). www.Fablabs.Io. Retrieved October 31, 2016, from https://www.fablabs.io/labs

[3] Gibson I., Rosen D. W., Stucker B., Additive Manufacturing Technologies: Rapid Prototyping to Direct Digital Manufacturing, vol. 54. Springer Ed, London, 2009.

DOI: 10.1007/978-1-4939-2113-3

[4] Gebhardt, A. "Understanding additive manufacturing.". Hanser Ed. Munich, (2011)

[5] Diegel, O., Nordin, A., Motte, D., Diegel, O., Nordin, A., & Motte, D. (2019). Additive manufacturing technologies. A Practical Guide to Design for Additive Manufacturing, 19-39.

DOI: 10.1007/978-981-13-8281-9_2

[6] Gardan, J. "Additive manufacturing technologies: State of the art and trends," Addit. Manuf. Handb. Prod. Dev. Def. Ind., vol. 7543, no. November, ç 149–168, 2017.

DOI: 10.1201/9781315119106

[7] Moreno Nieto, D., & Molina, S. I. (2020). "Large-format fused deposition additive manufacturing: a review." Rapid Prototyping Journal, 26(5), 793–799

DOI: 10.1108/RPJ-05-2018-0126

[8] Turner B. N. and S. A. Gold B. N., (2015) "A review of melt extrusion additive manufacturing processes: II. Materials, dimensional accuracy, and surface roughness," Rapid Prototyp J, vol. 21, no. 3, p.250–261.

DOI: 10.1108/RPJ-02-2013-0017

[9] Turner, B.N. ç and Gold A. (2014), "A review of melt extrusion additive manufacturing processes: I. Process design and modeling," Rapid Prototyp J, vol. 20, no. 3, 192–204, [Online]. Available: http://www.emeraldinsight.com/doi/abs/

DOI: 10.1108/RPJ-01-2013-0012

[10] Fernandez-Vicente, M., Calle, W., Ferrandiz, S., & Conejero, A. (2016). "Effect of infill parameters on tensile mechanical behavior in desktop 3D printing. 3D printing and additive manufacturing", 3(3), 183-192.

DOI: 10.1089/3dp.2015.0036

[11] Ahn S.-H. H., Montero M., Odell D., Roundy S., and Wright P. K., (2002) "Anisotropic material properties of fused deposition modeling ABS," Rapid Prototyp J, vol. 8, no. 4, p.248–257

DOI: 10.1108/13552540210441166

[12] Moreno-Sanchez D, Sanz de León A, Moreno Nieto D, Delgado FJ, Molina SI. (2022) "Basalt Fiber Composites with Reduced Thermal Expansion for Additive Manufacturing". Polymers.; 14(15):3216

DOI: 10.3390/polym14153216

[13] Thompson, A., Maskery, I. and Leach, R.K., (2016). "X-ray computed tomography for additive manufacturing: a review. Measurement Science and Technology", 27(7), p.072001.

DOI: 10.1088/0957-0233/27/7/072001

[14] "PLA - SmartMaterials3D" https://www.smartmaterials3d.com/pla-filamento#/2- tamano-m_750g/11-color-true_black/26-diametro-175_mm (accessed Feb. 10, 2023).

[15] K. Fayazbakhsh, M. Movahedi, and J. Kalman, "The impact of defects on tensile properties of 3D printed parts manufactured by fused filament fabrication," Mater. Today Commun., vol. 18, p.140–148, Mar. 2019.

DOI: 10.1016/J.MTCOMM.2018.12.003

[16] L. Marșavina et al., "Effect of the manufacturing parameters on the tensile and fracture properties of FDM 3D-printed PLA specimens," Eng. Fract. Mech., vol. 274, p.108766, Oct. 2022.

DOI: 10.1016/J.ENGFRACMECH.2022.108766