Mechanical evaluation of polymeric filaments and their corresponding 3D printed samples

OVIEDO, A.M.; PUENTE, A.H.; BERNAL, C.; PÉREZ, E.

POLYMER TESTING

ELSEVIER SCI LTD

Año: 2020 vol. 88 p. 1 - 17

0142-9418

3D printing technologies permits to produce functional parts with complex geometries, optimized topologies orenhanced internal structures. The relationship between mechanical performance and manufacturing parametersshould be exhaustively analyzed to warrant the long term success of printed products. In this work, the mechanical performance of filaments based on acrylonitrile butadiene styrene (ABS), polylactic acid (PLA) andpolylactic acid/polyhydroxyalkanoate (PLA/PHA) was investigated and also compared with their corresponding3D printed samples. In general, the specimen dimensional deviations were found to be within the tolerancesdefined by the standard testing protocols. Density values revealed a high level of filament fusion promoting anearly solid internal structure. The filaments exhibited improved tensile performance with respect to theircorresponding printed samples. Tensile and bending performance looked quite independent of the raster angle.Izod impact behavior was increased, for ABS systems printed with the �45� raster orientation. Quasi-staticfracture tests displayed improved crack initiation resistance with the 0�/90� raster angle. The crack propagation observed for the �45� specimens, through the bonding of the inter-layers, suggests weak entanglements.