Laszlo RACZ, Mircea Cristian DUDESCU


The aim of this article is to analyze the influence of infill percentage and infill pattern on the impact toughness of parts printed using the fused deposition modeling method. The mechanical behavior of the 3D printed materials under dynamic load was tested by Charpy impact test on standard specimens to find out the impact resilience of the samples. Influence of the printing parameters on the resilience of the samples was studied using two sets of specimens. The first set of samples where printed with the same infill pattern related to the longitudinal axis of the sample and a various infill percentage: 20%, 40%, 60%, 80% and 100%. The second set of samples were manufactured with an infill rate of 100%, but using various infill patterns. Impact resilience if 3D printed samples are increasing together with the infill rate, a noticeable improvement occurs when the infill range is passing over the 40%. Impact tests indicate that beside the infill rate the infill pattern is seriously influencing the result, the best result can be obtained when the printing direction of the pattern is transversal in relation to the impact load.

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