Journal
INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION
Volume 20, Issue 2, Pages 180-189Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/1023666X.2015.989076
Keywords
Carbon fibers; Failure mode; Mechanical; Fiber volume fraction; Composites
Categories
Funding
- China Postdoctoral Science Foundation [2014M551059]
- Special/Youth Foundation of Taiyuan University of Technology [2012L052]
- Qualified Personnel Foundation of Taiyuan University of Technology [tyutrc-201149a]
- Foundation of State Key Laboratory of Coal Conversion [J13-14-904]
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In this study, the effect of fiber content on the flexural property of continuous carbon fiber/epoxy composites was investigated. Samples with four different fiber volume fractions, 50, 60, 70, and 80 vol.%, were fabricated. For comparisons, cast epoxy resin was also prepared. It was observed that the flexural strength and modulus of this material are enhanced with increasing fiber volume fractions in the range of 50-70 vol.%. Results show that the carbon fiber/epoxy composites possess the largest fracture force and displacement when the fiber volume fraction is 70 vol.%, which is mainly attributed to the effective stress transfer of fibers. This can restrict crack tip propagation and blunt the crack tip, then consume abundant deformation energy and result in an increase of fracture work. On the other hand, poor flexural property was observed when the sample with high fiber volume fraction (80 vol.%) was tested. Three different types of failure modes were observed according to the fiber content.
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