ORIENTATION DEPENDENT MECHANICAL PROPERTIES OF 3D PRINTED POLYMER MATRIX COMPOSITES
Loading...
Authors
Hodgkins, Charles L.
Subjects
3D printing
additive manufacturing
composite filament
reinforced polylactic acid
mechanical properties
orientation dependent
graphene reinforced
bronze reinforced
steel reinforced
raster pattern
additive manufacturing
composite filament
reinforced polylactic acid
mechanical properties
orientation dependent
graphene reinforced
bronze reinforced
steel reinforced
raster pattern
Advisors
Kwon, Young W.
Nieto, Andy
Date of Issue
2021-06
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
The use of composite materials for 3D printing is a promising area of study that is largely under-researched. Traditionally manufactured composites are known to have superior mechanical qualities, yet characteristics of 3D printed composite materials are not well documented. In this study, polylactic acid composite filaments with both bronze and stainless-steel reinforcements were characterized using optical microscopy, X-ray powder diffraction, energy dispersive X-ray spectrometry, scanning electron microscope, and nanoindentation to determine reinforcement concentration and elemental composition of the filaments. Samples of each composite were printed with a fused deposition modeling 3D printer for compression and tensile testing in accordance with ASTM standards. Specimens with varying print patterns, build directions, and layer heights were tested to determine the efficacy of each material reinforcement and the effect these user-defined parameters have on the overall mechanical characteristics of the composite. Samples were subjected to 500 hours of accelerated weathering according to ASTM standards. Degradation was due largely to the ultraviolet exposure of the test, and the metallic reinforcements showed reduced crystallinity and resistance to physical deformation. This research provides the Navy and Department of Defense with qualitative data to determine the applicably of 3D printed parts for use in structural and load-bearing components onboard submarines.
Type
Thesis
Description
Series/Report No
Department
Mechanical and Aerospace Engineering (MAE)
Organization
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release. Distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.