Mechanical performance of ABS based filaments and 3D printed samples?.

E. PEREZ

Buenos Aires

Workshop; Workshop on deformation and failure of polymers and composites; 2018

ITPN, Hochschule Merseburg,Institut für Polyerwerkstoffe

The use of additive manufacturing has been adopted in awide range of industries to produce prototypes or end-use products due to involvedadvantages as, design flexibility, low volume production, reduced wastingmaterial, among others. The printed products are normally exposed to complexmechanical and thermal loading conditions during service. For this reason, therelationship between printing parameters and mechanical performance should beexhaustively analyzed to warrant the long term success. In the present work,the mechanical performance of filaments and 3D printed samples based on ABS wasinvestigated by tensile, flexural, impact and quasi-static fracture tests. Thecommercial based filaments used were: neat ABS, not-flame ABS and not-warpingABS. The different specimens were obtained with an infill of 100% and the layersfollowed printing orientations of 0º/90º or ±45º.In general, uniaxial tensile stress-strain curvespresented a yield point followed by strain softening before final fracture. Thefilaments exhibited the highest tensile performances. Some marginal increased ductilitywas observed for samples printed on the 45º orientation. Flexural stress-straincurves displayed a progressive drop of the load beyond the maximum value, forABS neat matrix and ABS-nw samples printed on the 90° direction reduced ductilitywas observed by means of loading drops at lower strain values. For Izodresistance and strength was observed increased values of the different ABSsystems printed on the 45° orientation compared to 90° samples. In addition,modified ABS (ABS-nf and ABS-nw) printed in this direction exhibited enhancedIzod impact performance compared to neat ABS. For quasi-static fracture tests,load-displacement curves for 90º orientation samples exhibited ductile instability. On the other hand, tests of 45ºsamples had to be interrupted due to the crack clearly did not propagatethrough the cross-section and/or the sample did not break at all. Crackinitiation toughness (KIQ)values for 90° samples were slightly higher than to 45° samples. On the otherhand, the strain energy release rate (Gcp)values determined for samples printed on the 90° orientation remained almostconstant.