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Effect of Printing Parameters on Mode i Fracture Toughness of FFF Printed PLA Samples

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Abstract:

3D printing, commonly referred to as Additive Manufacturing (AM), enables the creation of both simple and complex three-dimensional objects. While AM encompasses a variety of manufacturing techniques, Fused Filament Fabrication (FFF), is the most prevalent method. FFF constructs 3D models layer-by-layer by extruding molten material in a specified pattern. This paper examines the fracture properties of components produced through the FFF process. To achieve this, Single Edge Notched Bend (SENB) specimens were fabricated from polylactic acid (PLA) thermoplastic material. Various printing parameters were explored, including infill density (40, 70, and 100%), infill patterns (grid, cubic, and concentric), and printing directions (0, 45, and 90°). Three-point bending (3PB) tests were conducted at room temperature (25 °C) in accordance with ASTM D5045-14 standards. The 3PB results indicate that the mode I fracture toughness values are significantly affected by the printing parameters examined, with the greatest variations linked to infill density, followed by infill pattern and printing direction. Additionally, the fracture mechanisms associated with SENB specimens produced under different parameters exhibited distinct characteristics.

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Periodical:

Materials Science Forum (Volume 1167)

Pages:

47-54

DOI:

https://doi.org/10.4028/p-7xrgQ0

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Online since:

November 2025

Authors:

Razvan Paul Bercuci, Marian Vasile Baban, Emanoil Linul*

Keywords:

FFF, Fracture Properties, Infill Density, Infill Pattern, PLA, Properties

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© 2025 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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