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 str...

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Detalles Bibliográficos
Autores: Cicero González, Sergio|||0000-0002-3950-6071, Martínez Mata, Víctor|||0000-0003-3464-0762, Castañón Jano, Laura|||0000-0002-5968-2726, Alonso Estébanez, Alejandro|||0000-0003-2480-1980, Arroyo Martínez, Borja|||0000-0003-3037-652X
Tipo de recurso: artículo
Fecha de publicación:2021
País:España
Institución:Universidad de Cantabria (UC)
Repositorio:UCrea Repositorio Abierto de la Universidad de Cantabria
Idioma:inglés
OAI Identifier:oai:repositorio.unican.es:10902/23888
Acceso en línea:http://hdl.handle.net/10902/23888
Access Level:acceso abierto
Palabra clave:Fracture
Notch effect
Additive manufacturing
PLA
Graphene
Descripción
Sumario: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.

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