Author(s):
1. Nikola Palic, Fakultet inženjerskih nauka Univerziteta u Kragujevcu, Serbia
2. Strahinja Milenković, Institute for Information Technologies, University of Kragujevac, 34000 Kragujevac, Serbia, Serbia
3. Zivana Jovanovic, Fakultet inženjerskih nauka Univerziteta u Kragujevcu, Serbia
4. Vukasin Slavkovic, Fakultet inženjerskih nauka Univerziteta u Kragujevcu, Serbia
5. Sasa Njezic, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina
6. Nenad Grujović, Fakultet inženjerskih nauka Univerziteta u Kragujevcu, Serbia
7. Fatima Živić, Fakultet inženjerskih nauka Univerziteta u Kragujevcu, Serbia

Abstract:
This study investigates various joining techniques for 3D-printed Polylactic Acid (PLA) specimens in comparison with fully printed specimens. Fused Deposition Modeling (FDM) is employed as the primary 3D printing method due to its cost-effectiveness and PLA's biocompatibility. Three distinct joining methods: welding, super glue, and hot glue are examined for their impact on the mechanical properties of PLA. Experimental part of study included two different ASTM D638 Type V dog bone tensile testing specimen preparation approach. One approach was 3D printing complete dog bone specimen, and the second one was two-halves fabrication of above mentioned specimens. These halves are subsequently joined using the selected techniques. The samples were tested for tension, in this way it was shown which of the joining techniques shows the results that are closest to the results of completely printed samples. The best characteristics from aspect of load bearing, both in sustained elongation (2.63 mm) and maximum load (396 N) was demonstrated by fully printed specimen. Among three joined specimens, the best characteristics were demonstrated by welded specimen (elongation at break = 1.72 mm; maximum load = 306 N), followed by superglued (elongation at break = 1.69 mm; maximum load = 125 N) and hot glued (elongation at break = 2.11 mm; maximum load = 31 N).

Key words:
3D printing, PLA, joining materials, tensile testing,3D printing,PLA,joining materials,tensile testing

Date of abstract submission:
18.08.2023.

Conference:
Contemporary Materials 2023 - Savremeni materijali

Applied paper from author