CHARACTERIZING THERMOMECHANICAL PROPERTIES OF LARGE-FORMAT PRINTED COMPOSITE POLYMER STRUCTURES

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Date

2023

Authors

Corum, Tyler
O'Connell, Johnna
Heres, Maximilian
Foote, Jeff
Duty, Chad

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Publisher

University of Texas at Austin

Abstract

Large-format additive manufacturing (LFAM) is a manufacturing technique where a high volume of material is extruded in a layer-by-layer fashion to form structures that typically measure several meters in scale. The LOCI-One system is an LFAM-type system operated by Loci Robotics, Inc. that features a high throughput extruder mounted on a 6-axis robot arm. This research used the LOCI-One system to print single bead walls of 20% by weight carbon fiber reinforced acrylonitrile butadiene styrene (CF-ABS) at various layer deposition methods, print speed, layer times, and bead widths. The coefficient of thermal expansion (CTE) of the printed structures was measured to quantify effects of print conditions on thermomechanical performance. The CTE of the LFAM printed walls was measured using a large-scale digital image correlation system to characterize the distortion of the fiber reinforced composite material in the x- (print direction) and z- (between layers) directions. This study determined that with varying print parameters the CTE measured in the x-direction was largely influenced by bead geometry with the CTE measured in the z-direction relatively unaffected by either the varying parameters or the method in which layer deposition occurred.

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