Sliding wear characteristics of FDM-processed polylactic-acid in bovine blood serum

Fused deposition modelling (FDM) has so far been recognized for its reliability and simplicity manufacturing of geometrically-complex polymeric materials with 3D printing technique. Recently, the studies concerning properties fabricated by using FDM have growing, including those related to their wear resistance which is considered critical when a 3D-printed material must work sliding over surface another during application. Up now, however, influence several FDM-printing parameters, raster orientations, on printed not yet fully understood. In this research, orientations FDM-processed polylactic-acid (PLA) in bovine blood serum were determined. A reciprocating pin-on-plate tribometer was used evaluate cylindrical PLA pin that slid commercially-pure titanium (Ti) plate. The results showed FDM-printed pins unidirectional had higher factors (WF), i.e., ~1.5 ´ 10-4 mm N-1 m-1 than crossed ~0.8 m-1. Meanwhile, WF values Ti against ~0.09 m-1, also significantly lower having orientation, 0.34 – 0.41 result analysis worn morphologies shows indications abrasion, fatigue polymer film transfer as possible mechanisms both countersurface material. On basis all findings it can be concluded orientation preferable one parameters resistant rather orientation.