Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
INFLUENCE OF PRINTING PARAMETERS AND MEAN STRESS ON THE FATIGUE BEHAVIOR OF ABS SAMPLES OBTAINED BY FFF
Submission Author:
Vinícius Hiroshi Souza Miwa , SP , Brazil
Co-Authors:
Vinícius Hiroshi Souza Miwa, Angélica Oliveira de Barcelos , Manuel Barcelos Júnior, Sergio Henrique da Silva Carneiro, Daniel Fernandes da Cunha
Presenter: Vinícius Hiroshi Souza Miwa
doi://10.26678/ABCM.COBEM2023.COB2023-1487
Abstract
Fatigue fracture is a leading cause of mechanical failure, making it critical to understand the behavior of polymeric materials, particularly Acrylonitrile Butadiene Styrene (ABS), in this phenomenon. The objectives of this study were to develop and characterize printed ABS specimens using fused filament manufacturing with different filament directions and variations in printing parameters and to investigate the behavior of the material under mechanical fatigue. The study began by designing and printing the specimens using standardized methods. Static tests were then performed to characterize the material, including predicting the effect of mean stress using various methods such as Goodman, Soderberg, Gerber, and ASME Elliptical. To predict the stress-life (S-N) curve, a method based on Juvinall’s approach was developed and evaluated. Finally, the mechanical response of specimens printed with different filament depositions was compared with results from tests performed previously. Among the methods used, the Gerber method proved to be the most effective in predicting the variation in fatigue life as a function of the mean stress. The method adapted from Juvinall also demonstrated a coherent approximation of the experimental result for predicting the S-N curve. However, the need to use Gerber during development was identified. The comparison of the specimens' mechanical response showed that those with filaments parallel to the load exhibited better results than perpendicular ones. Crossed filaments showed intermediate resistance, greater ease of printing for the body in question and appears to be a good approximation for an isotropic material. Nonetheless, the choice of orientation should consider the properties of each print. From the results, it was also possible to identify a significant variation in mechanical resistance depending on the printer and chosen to manufacture parameters. Furthermore, among the printing parameters evaluated, the only one that demonstrated relevance to the result was the internal padding. In conclusion, understanding the behavior of ABS in fatigue fracture is critical in many applications. This study provides a valuable contribution by characterizing the material, developing new methods for predicting its behavior, and comparing the effects of different filament orientations and other printing parameters on the mechanical response.
Keywords
3D printing, Fracture Mechanics, FFF, fatigue
