Mechanics of nozzle clogging during direct ink writing of fiber-reinforced composites

被引：84

作者：

Croom, Brendan P. ^{[1
,5
]}

Abbott, Andrew ^{[1
,2
]}

Kemp, James W. ^{[3
]}

Rueschhoff, Lisa ^{[1
]}

Smieska, Louisa ^{[4
]}

Woll, Arthur ^{[4
]}

Stoupin, Stanislav ^{[4
]}

Koerner, Hilmar ^{[1
]}

机构：

[1] Air Force Res Lab, Mat & Mfg Directorate, 2941 Hobson Way, Wright Patterson AFB, OH 45433 USA

[2] Univ Dayton, Res Inst, 300 Coll Pk, Dayton, OH 45469 USA

[3] Univ Tennessee, Mech Aerosp & Biomed Engn Dept, 1512 Middle Dr, Knoxville, TN 37996 USA

[4] Cornell High Energy Synchrotron Source, 161 Synchrotron Dr, Ithaca, NY 14853 USA

[5] Johns Hopkins Univ, Appl Phys Lab JHU APL, Res & Exploratory Dev, Laurel, MD 20723 USA

来源：

ADDITIVE MANUFACTURING | 2021年 / 37卷

关键词：

Direct write; Nozzle clogging; Polymer matrix composite; Ceramic matrix composite; 3D printing;

D O I：

10.1016/j.addma.2020.101701

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：11

共 28 条

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