Journal
JOURNAL OF COMPOSITE MATERIALS
Volume 48, Issue 16, Pages 1993-1999Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0021998313493810
Keywords
Torsion property; single fiber; direct torsion failure test; carbon fiber
Categories
Funding
- National Natural Science Fund Program of China [51103003, 51273007]
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A novel approach for evaluating the torsional performance of single carbon fiber filament was established based on a self-designed apparatus. The number of torsion turns and twist angle at fracture from the direct torsion failure test were defined to characterize the torsion-bearing capacity of single carbon fiber. The fiber fracture strain under torsion stress was calculated based on a single fiber torsional deformation model and was compared with the fiber elongation in tension, which showed that the toughness of carbon fiber under torsion shear stress was inferior to its resistance to tensile stress. In addition, the resistance of carbon fiber to torsion shear stress was changed after changing the fiber surface structure by removing the sizing agent or coating the fiber surface with epoxy resin. The established method will enrich the existing research work on mechanical properties of carbon fiber as well as those for different types of fibers.
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