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Enhancing Interlayer Adhesion of Fused Deposition Modeling through Thermo-mechanical Methods
A. Andreu(알베르토),S. Kim(김상래),Y.-J. Yoon(윤용진) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
Although notable advancements in FDM 3D printing have been achieved, weak mechanical properties remain a barrier to produce functional components. This limitation is a result of weak interlayer bonding inherent to the layer-by-layer fabrication since the lower layers rapidly cool below glass transition temperature before the next one is deposited. This work presents an inexpensive solution that targets the process of interlayer bond formation to increase the mechanical properties of FDM printed components and reduce anisotropy. This is done through the installation of a heated roller to slightly compress each layer homogeneously onto the previous one after it has been printed. In summary, tensile testing shows a maximum UTS, tensile modulus and strain increase of 38.8, 19.4, and 359.6% respectively. Furthermore, flexural analysis shows a maximum increase in UFS, flexural modulus and strain of 13.5, 20.76, and 11.9% respectively. Lastly, DSC analysis shows an increase in crystallinity of tested samples from 2.7 to 8.6%. Thermo-mechanical methods are proposed since pressure forces can be used to increase filament surface contact, and heat can be used to enable longer diffusion and neck growth.