Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 175, Issue -, Pages 18-27Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2019.03.005
Keywords
3D printing; Fiber-reinforced composites; High-resolution X-ray microscopy; Microstructural analysis; Mechanical property
Categories
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [NRF-2017R1A2B3002307]
- National Research Council of Science & Technology (NST) [CPS-18-03-ETRI]
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A high-resolution X-ray microscope was used to quantitate the internal morphological characteristics of 3D-printed, basalt-fiber-reinforced PLA composites. 3D-printed composites have microstructures and mechanical properties that are distinct from those of conventional mold-pressed composites. One such distinction lies in the presence of voids, which form naturally during 3D printing. All of the composite components, including the fiber, the matrix, and the aforementioned voids were oriented parallel to the printing direction. The mechanical properties of the final composites were also greatly impacted by their microstructural characteristics, including fiber length, fiber orientation, and the presence of voids. It was also confirmed that the voids generated during the 3D printing process can be classified into two types (inter- and inner-filament voids), whose shapes, sizes, and distributions are completely different from each other, and that they clearly have a decisive influence on the remarkable differences in the strength of the composites.
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