Title: Characterizing Thermal Expansion of Large-scale 3D Printed Parts

Authors: Dylan Hoskins, Vlastimil Kunc, Ahmed Hassen, John Lindahl, and Chad Duty

DOI: 10.33599/nasampe/s.19.1598

Abstract: Additively manufactured parts have an inherent mesostructure as a result of printing artifacts. The build structure is defined by parameters such as infill pattern, raster spacing, and bead height, and can impart anisotropic thermo-mechanical properties that are different from the bulk properties of the feedstock. The anisotropy is more pronounced when printing with fiber reinforced polymers due to the shear-alignment of fibers during the extrusion process. This study evaluates the combined effects of the printed mesostructure and the fiber-aligned microstructure on the coefficient of thermal expansion of large-scale printed parts. A digital image correlation-based method for recording thermal strain across the surface of a printed part is described. Measured values are compared to predictions based on laminate theory using the anisotropic material properties at the microscale for common raster orientations.

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Conference: SAMPE 2019 - Charlotte, NC

Publication Date: 2019/05/20

SKU: TP19--1598

Pages: 13

Price: FREE