Journal
ADDITIVE MANUFACTURING
Volume 37, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.addma.2020.101701
Keywords
Direct write; Nozzle clogging; Polymer matrix composite; Ceramic matrix composite; 3D printing
Funding
- Air Force Research Laboratory [FA8650-19-2-5220]
- NRC Research Associateship award at Air Force Research Laboratory
- USRA AFRL Summer Scholars Fellowship [FA9453-18-2-0009]
- University of Tennessee Chancellor's Fellowship
Ask authors/readers for more resources
The study found that nozzle clogging is closely related to fiber volume fraction, fiber length, and nozzle geometry, with specific mechanisms including misorientation, entanglement, and accumulation of fibers. Suggestions to reduce the prevalence of nozzle clogging have been proposed.
Nozzle clogging frequently occurs while printing fiber-filled polymer inks with extrusion-based additive manufacturing processes, which limits the quantity of fibers that can be added to the matrix, part fidelity, and geometric accuracy of the printing process. Both in situ X-ray radiography and ex situ X-ray computed tomography were used to explore the mechanisms that contribute to nozzle clogging. Three inks were considered, with fiber volume fractions ranging from 1% to 5.75%, and nominal fiber lengths from 150 to 470 mu m. These results showed that the specific mechanisms that produced the clog depended substantially on the fiber volume fraction, fiber length and nozzle geometry. Specific clogging mechanisms included the log-jam pileup of misoriented fibers near the nozzle tip, the lodging of a fiber entanglement in the nozzle tip, and the accumulation of misoriented fibers at step-like reductions in the nozzle profile. Suggestions to reduce the prevalence of nozzle clogging are presented.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available