Abstract
Multi jet fusion (MJF) technology has proven its significance in recent years as this technology has continually increased its market share. Recently, polypropylene (PP) was introduced by Hewlett-Packard for the given technology. To our knowledge, little is known about the mechanical properties of polypropylene processed by MJF technology. During this study, standardised specimens were printed under all of the major orientations of the machine’s build space. Each of these orientations were represented by five samples. The specimens then underwent tensile, bending and Charpy impact tests to analyse their mechanical properties. The structural analysis was conducted to determine whether PP powder may be reused within the MJF process. The mechanical tests showed that the orientation of the samples significantly influences their mechanical response and must be carefully chosen to obtain the optimal mechanical properties of PP samples. We further showed that PP powder may be reused as the MJF process does not significantly alter its thermal and structural properties.
Highlights
The toughness of the tested samples was significantly lower for the specimen orientation of 001, followed by a toughness value for the orientation of 111
We hypothesise that printing specimens with a relatively small layer area excessively overheats the printing material and the resultant mechanical properties may be degraded to some extent
The ability of multi jet fusion (MJF) printing technology to accept PP powder opens up new possibilities in the decision-making process in material/structural engineering
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The multi jet fusion (MJF) method was first introduced by Hewlett-Packard in 2016. Overall printing quality and the affordable price of its products, MJF technology is often used in the segment of small series production of plastic parts [1]
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