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Development of Functionally Graded Material Capabilities in Large-scale Extrusion Deposition Additive Manufacturing...

Publication Type
Conference Paper
Journal Name
Solid Freeform Fabrication Proceedings
Book Title
Solid Freeform Fabrication 2019: Proceedings of the 30th Annual International Solid Freeform Fabrication Symposium
Publication Date
Page Numbers
1793 to 1803
Publisher Location
Texas, United States of America
Conference Name
Solid Freeform Fabrication Symposium 2019 (SFF)
Conference Location
Austin, Texas, United States of America
Conference Sponsor
University of Texas - Austin
Conference Date

Additive manufacturing’s (AM) layer-by-layer nature is well-suited to the production of Functionally Graded Materials (FGM) with discrete material boundaries. Extrusion deposition is especially advantageous since multiple nozzles easily accommodate the inclusion of additional materials. However, discrete interfaces and sudden composition changes can limit the functionality of a printed part through inherently weak bonding. Furthermore, same-layer transitions are not only difficult to execute, but also further amplify structural weaknesses by creating multiple discrete interfaces. Therefore, successfully implementing a blended, continuous gradient will greatly advance the applicability of FGM in additive manufacturing. The pellet-fed nature and integrated screw design of the Big Area Additive Manufacturing system enables material mixing needed for development of this capability. Using constituent content analysis, this study evaluates the transition behavior of a neat ABS/CF-ABS material pair and characterizes the repeatability of the mixing and printing process, which ultimately leads to control of site-specific material deposition and properties.