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Preferred orientation of chopped fibers in polymer‐based composites processed by selective laser sintering and fused deposition modeling: Effects on mechanical properties
Author(s) -
Badini Claudio,
Padovano Elisa,
De Camillis Rosario,
Lambertini Vito Guido,
Pietroluongo Mario
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49152
Subject(s) - materials science , composite material , ultimate tensile strength , selective laser sintering , anisotropy , isotropy , microstructure , fiber , polymer , layer (electronics) , fused deposition modeling , molding (decorative) , sintering , 3d printing , physics , quantum mechanics
The orientation of reinforcing fibers in polymer‐based composites greatly affects their mechanical features. It is known that different orientations of continuous fibers in the stacked layers of a laminate play a crucial role in providing an isotropic mechanical behavior, while the alignment of chopped fibers in injection molding of composites results in a degree of anisotropy. Recent additive manufacturing techniques have offered a way of controlling the fiber orientation. This article aims to investigate the effect of fiber orientation on the mechanical properties of polyamide/carbon fiber composites processed by fused deposition modeling and selective laser sintering. Tensile samples which had different fibers and layer interface with respect to the sample axis (and therefore to the tensile load) were produced. Tensile tests were performed at different strain rates; the tensile properties and the fracture surface morphology were correlated with the processing method and the sample microstructure. The best strength and stiffness were observed when the fibers and the layer interfaces were parallel to the sample axis.