显微照相
材料科学
表征(材料科学)
复合材料
扫描电子显微镜
纳米技术
作者
Rafael Thiago Luiz Ferreira,Igor Amatte,Thiago Assis Dutra,David Bürger
标识
DOI:10.1016/j.compositesb.2017.05.013
摘要
Abstract The objective of this work is the mechanical characterization of materials produced by 3D printing based on fused filament fabrication (FFF, analogous to FDM ® ). The materials chosen are a polylactic acid (PLA) and a PLA reinforced with short carbon fibers in a weight fraction of 15 % (PLA+CF). In view of the FFF nature, which produces specimens layer by layer and following predefined orientations, the main assumption considered is that the materials behave like laminates formed by orthotropic layers. If the 3D printing is made in the 1 − 2 plane, where 1 is the deposition direction and 2 is a direction perpendicular to 1, the mechanical properties obtained are the tensile moduli E 1 and E 2 , the Poisson ratios ν 12 and ν 21 , the shear modulus G 12 and related strength properties. For this purpose, only unidirectional or specially oriented specimens are used. After tests up to material failure, scanning electron microscopy (SEM) is employed to observe fracture surfaces. It was noticed that, in the microstructure of the PLA+CF, the short carbon fibers stay highly oriented with the material deposition direction in the FFF specimens. This fact, and the also observed length of the fibers, explains differences in material properties encountered among the performed experiments.
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