Date of Award

9-14-2017

Document Type

Thesis

Degree Name

Master of Science in Engineering Management

Department

Department of Systems Engineering and Management

First Advisor

Jason K. Freels, PhD.

Abstract

Carbon fiber reinforced polymer manufactured using additive manufacturing process is relatively a new process. The ability to predict the mechanical properties of these parts with high confidence will spread the use of these high-strength materials in more applications. The purpose of this research was to determine the effect of the build time between successive layers, arrangement of fiber and nylon layers, fiber start location, and the use of support material on the mechanical properties CFRP produced by additive manufacturing process using the MarkForged (MarkOne) 3D printer. A design of experiment (DOE) we preformed to develop a mathematical model describing the functional relationship between the tensile strength of additively manufactured composites and the selected additive manufacturing build process parameters. Testing was performed in accordance with ASTM standard D3039 using the 25 manufactured specimens. The mechanical properties were measured in the experiment were tensile strength, and tensile stress. A liner regression analysis was preformed to determine the relation between the ultimate tensile strength and the main level interactions of the four build parameters. The results showed a significant positive relation longer the build time between successive layers, and negative relation with the other fiber and nylon layer arrangement. However, the two other build parameters showed negative, but not significant results.

AFIT Designator

AFIT-ENV-MS-17-S-046

DTIC Accession Number

AD1051573

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