Experimental investigation of the impact toughness of polylactic acid-PLA specimens fabricated by FFF 3D printing using the Charpy method
(naslov ne postoji na srpskom)
aTechnical College of Applied Sciences, Zrenjanin bLola institut, Beograd, Srbija cUniverzitet u Novom Sadu, Tehnički fakultet 'Mihajlo Pupin', Zrenjanin, Srbija
e-adresa: dusan.jovanic@vts-zr.edu.rs
Ključne reči: Impact toughness testing; Charpy method; Additive manufacturing; Fused Filament Fabrication (FFF); Polylactic acid (PLA)
Sažetak
(ne postoji na srpskom)
This paper presents an experimental investigation of the impact toughness of 3D-printed specimens made of polylactic acid (PLA) using the Fused Filament Fabrication (FFF) process, tested by the Charpy method. One of the main disadvantages of 3D printing is that the parts often have significantly lower mechanical properties, making mechanical testing necessary to determine their functional suitability. The testing of impact toughness for plastic materials was carried out in accordance with the standard EN ISO 179-1: 2023 Plastics-Determination of Charpy impact properties-Part 1: Non-instrumented impact test. Among the most important adjustable 3D printing parameters in the FFF process are the layer height and infill pattern. This research specifically investigates how different layer heights and infill types (linear, zig-zag, and concentric) affect the impact toughness of PLA specimens. The results confirm that higher layer heights and concentric infill patterns result in greater impact toughness, due to better interlayer bonding and more effective stress distribution under impact load.
|