Avaliação do tipo de preenchimento na resistência mecânica de peças fabricadas em petg por impressão 3d

Abstract

With the accelerated development of technology, parts manufacturing models followed the flow of innovations, as is the case with additive production (AM), with a focus on reducing waste, the pace of manufacturing and the creation of complex elements. The material deposition fusion (FDM) method has become a reference in AM, with an emphasis on the development of parts and prototypes in three-dimensional flowers. From this perspective, it is essential to study printing parameters to improve the manufacturing process and obtain guaranteed parts. Therefore, the objective of the work in question is to analyze the influence of the type of filling on the mechanical resistance of parts manufactured by 3D printing with the material polyethylene glycol terephthalate (PETG). A study was carried out regarding the properties of the material, the definition of the geometry for manufacturing the test specimens, the modeling, the printing of the parts, the precision, the tensile test and the analysis of the results. Dimensional analysis, tensile strength limit, elongation, mass and time were the conditions evaluated for variation in filling types. To study the results, the statistical method of analysis of variance (ANOVA) was used. Through manufacturing and tensile testing, it was verified that the type of filling does not influence the dimensions of the part. The tensile strength limit was influenced by the internal standard, since the empty spaces behave as stress concentrators, facilitating rupture. In relation to elongation at break, voids also had a negative effect and the behavior of standard grade molecular chains caused an increase in tension during elongation with PETG. Through the variance test, it was found that the type of filling has a significant effect on the mass, in which the zigzag type presented the highest mass and the cubic subdivision the lowest. This factor is directly associated with the amount of material deposited by the extruder nozzle. Another factor that is influenced by the type of filling is time, with patterns that have wavy lines taking longer to manufacture and those with straight lines taking less time.