Influência dos parâmetros de impressão 3D na resistência ao impacto de peças impressas em material ASA

Abstract

Additive manufacturing (AM), also known as 3D Printing, has been widely used in the development of prototypes through rapid prototyping and functional parts. It is a manufacturing process that typically reduces raw material consumption compared to subtractive processes, as well as allows to generate prototypes or parts in their final configuration. There are several AM techniques, and among the least expensive is Fusion Deposition Modeling (FDM). It uses filaments that are extruded through a print extruder head that heats to the melting temperature of the filament material. In addition, printing parameters need to be selected to produce a prototype or part. However, there is a lack of information related to the printing parameters and the impact mechanical properties of the printed prototypes or parts. The objective of this work is to evaluate the effect of printing parameters on the impact strength of specimens (CPs) printed on acrylonitrile styrene acrylate (ASA). For this purpose, the experimental research method was used and notchless CPs were produced in ASA material according to ISO 179-1:2010 using a commercial 3D printer. Printing parameters such as interlayer height, body thickness and fill angle were adjusted to print 162 CPs with 27 different parameter combinations and 6 repetitions. For determination of absorbed energy and impact strength, the CPs were tested using a commercial impact testing machine and Charpy impact test setup as per ISO 179-1:2010. The results show that the impact strength is directly related to the printing parameters. It can be concluded from the results that the trend is to increase impact strength concomitantly with increasing layer height and body thickness; as well as using a 45° angle when filling the material, which corroborates the results found in the literature. Such observations allow predicting the mechanical impact resistance of prototypes or printed parts and enables greater accuracy in choosing the printing parameters.