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Analysis of notch effect in the fracture behaviour of additively manufactured PLA and graphene reinforced PLA

Abstract: The fracture assessment of additively manufactured PLA and graphene reinforced PLA (PLA-GR) has been performed in this paper. Tensile and fracture specimens were fabricated with three different raster orientations (0/90, 30/-60 and 45/-45) in order to analyse the effect of the printing strategy on the resulting mechanical properties. A total of 30 tensile tests and 120 fracture tests were performed, covering fracture samples with defects of different notch radii (0 mm, 0.25 mm, 0.5 mm, 1 mm and 2 mm). The Theory of Critical Distances was applied over the fracture results, obtaining estimations of the corresponding critical distances and the subsequent predictions of the apparent fracture toughness. Graphene addition has a different effect depending on the raster orientation. Graphene causes a significant improvement of tensile and fracture properties for specimens fabricated at 30/-60 and 45/-45. However, this phenomenon is not observed in raster orientation 0/90. SEM analysis shows a clear change in the fracture micromechanisms between PLA and PLA-GR. It can be also observed how graphene samples of 30/-60 and 45/-45 present a similar aspect of the fracture surfaces, which are different from those observed in raster orientation 0/90.

 Autoría: Cicero S., Martínez-Mata V., Castanon-Jano L., Alonso-Estebanez A., Arroyo B.,

 Fuente: Theoretical and Applied Fracture Mechanics 2021, 114, 103032

 Editorial: Elsevier

 Fecha de publicación: 01/08/2021

 Nº de páginas: 20

 Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.tafmec.2021.103032

 ISSN: 0167-8442,1872-7638

 Proyecto español: PGC2018-095400-B-I00

 Url de la publicación: https://doi.org/10.1016/j.tafmec.2021.103032