| PHYSICOMECHANICAL CHARACTERISTICS OF CARBON FIBER REINFORCED POLYMER COMPOSITE USING X-RAY DIFFRACTION, ATOMIC FORCE AND ELECTRON MICROSCOPIES
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| Ye Htet Lin 1, Preechar Karin 1, Patcharee Larpsuriyakul 2, Naoto Ohtake 3 |
1School of Engineering, King Mongkut’s Institute of Technology Ladkrabang
2)National Metal and Materials Technology Center
3School of Engineering, Tokyo Institute of Technology |
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| ABSTRACT |
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The physicomechanical characteristics of PAN-based carbon fibers were investigated by SEM-EDS, XRD,
TEM and AFM analysis while the mechanical properties of the composites were studied by tensile, flexural and Charpy
impact tests with ASTM standards. Regarding the tensile test of carbon fiber fabric, the average tensile strength of CF-Ⅰ,
CF-II and CF-III fibers were around 147 MPa, 137 MPa and 225 MPa and the tensile modulus of those were 12.8 GPa, 13.2
GPa and 12.8 GPa, respectively. Later, the nanostructure of carbon fiber was recognized not as a pure graphite carbon
structure because they mixed with graphite and amorphous structures. The higher tensile strength and modulus of CF-III fiber
fabric was lower interlayer spacing (d002) because it consisted of more graphene layers in the graphite structure when
compared with CF-Ⅰ and CF-Ⅱ fiber fabrics. Concerning AFM analysis’s results, CF-Ⅰ fiber fabric has higher surface
roughness (Ra) of 34.8 nm and more in-depth with wider pit lines along the fiber axis, which caused higher mechanical
properties among the three composites. According to this article, the nanostructure of carbon fibers had a lower impact on
CFRP composite because the interfacial bonding between fiber and epoxy matrix, which obtained the higher mechanical
properties in the composite, was directly enhanced by the higher surface roughness of the fibers. |
| Key Words:
Carbon fiber fabric, Carbon fiber composite, Carbon fiber reinforced polymer, Fracture mechanism, Electron microscopy images, Polymer composites
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Corresponding Author.
Preechar Karin , Email. 
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