Work

The effect of infill density on fracture toughness results of PLA material

Year: 2025

Type: article

Abstract: The main objective of this research is to obtain a comprehensive insight into the influence of infill density on the fracture toughness results of PLA material, used in FDM technology. This paper presents four infill cases (100%; 70%; 40%; 10%) with 0.1 mm layer height. The whole research includes cases from 10 to 100% infill with a 10% increment on three different layer heights (0.3; 0.2; 0.1 mm). The FDM-grade PLA material is brittle hence, the fracture toughness of this material was estimated using the ASTM D5045-14 standard on SENB specimen geometry. This standard requires the plane-strain state near the crack tip to be met to obtain valid results. Three specimens were tested per infill group, all of which met the plane-strain condition. However, when looking at the K IC results from the highest to the lowest infill in all three considered layer configurations, the SENBs start to fail at 50%-onward due to the apparent presence of plasticity. This is evident from the maximum load value in the lower infill cases, where it exceeds the conditional value by more than the limit value of 10%. Therefore, for a better assessment of current results, the J integral approach was also used.

Source: Procedia Structural Integrity

DOI: 10.1016/j.prostr.2025.06.151

Authors: Aleksa Milovanović, Tomáš Babinský, Aleksandar Sedmak, Ivana Filipović, Miloš Milošević

Institutions: University of Belgrade, Czech Academy of Sciences, Institute of Physics of Materials

Language: English

Topic: Additive Manufacturing and 3D Printing Technologies

Subfield: Automotive Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: diamond

Funder: Ministarstvo Prosvete, Nauke i Tehnološkog Razvoja