Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
ANALYSIS OF THE IMPACT OF THE PART AIR COOLING ON THE INTERLAYER YIELD STRENGTH IN ADDITIVE MANUFACTURING OF PLA AND PETG
Submission Author:
Leonardo Thiesen Baum , RS , Brazil
Co-Authors:
Leonardo Thiesen Baum, Jacqueline Copetti
Presenter: Leonardo Thiesen Baum
doi://10.26678/ABCM.COBEM2021.COB2021-0310
Abstract
With the increasingly widespread use of additive manufacturing, it is essential to have a full understanding of the final mechanical properties of the manufactured parts in order to obtain the full advantages of this technology. From prototypes to functional parts, we are experiencing a shift of the production style, the popular called “3D Printer” is taking over industries and changing long-lasting concepts. Additive manufacturing offers a big advantage to segments like aviation, where projects last for decades and the weight of a part directly influences the performance of the plane. The possibility to produce organic shapes with ease and to maintain zero stock police, keeping the files and the 3D Printer ready to produce a part on demand, is extremely attractive to this segment. One of the key components present in practically all 3D printers, that work with material extrusion technologies by material fusion, is the cooling fan, which helps to ensure dimensional accuracy as well as improving the finish aspect of the part, but it may end up impacting the mechanical properties of the final part. The study was carried out by making specimens, according to ASTM D638, in PLA and PETG and changing the cooling fan rate for each specimen. With the performance of tensile strength tests, the difference in the yield strength was determined and the cooling fan speed was correlated with the yield limit. Finally, it was tested whether the behavior is repeated when utilizing materials from another manufacturer. The impact in the yield strength in the bond between layers suffered a reduction around 40%, when compared to printed specimens with the cooling fan turned off. This finding shows that for parts manufactured in order to resist stresses, the best practice is to use the cooling fan turned off during printing.
Keywords
Additive Manufacture, interlayer adhesion, process parameters, Yield Strength, 3D printing
