Analysis of elastic properties of carbon nanotube reinforced nanocomposites with pinhole defects |
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| Authors: | Unnati A Joshi Satish C Sharma SP Harsha |
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| Affiliation: | 1. Department of Transportation System Engineering, Graduate School of Transportation, Korea National University of Transportation, Uiwang-si, Gyeonggi-do 437-763, Republic of Korea;2. Department of IT Convergence Engineering, Graduate School, Korea National University of Transportation, Chungju 380-702, Republic of Korea;3. Department of Safety Engineering, Korea National University of Transportation, Chungju 380-702, Republic of Korea;4. Department of Electronic Engineering, Semyung University, Jecheon 390-711, Republic of Korea;1. Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan;2. Department of Environmental Sciences, University of Yamanashi, 4-4-37, Takeda, Kofu, Yamanashi 400-8510, Japan;3. Fuji Research Laboratory, Tokai Carbon Co., Ltd., Oyama, Shizuoka 410-1431, Japan;4. Development Department, Shonan Plastic Mfg. Co., Ltd., Hiratsuka, Kanagawa 254-0807, Japan;5. Corporate Research Department, Toho Gas Co., Ltd., Nagoya, Aichi 456-8511, Japan;1. Department of Mechanical Engineering, University of Guilan, P.O. Box 3756, Rasht, Iran;2. School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA |
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| Abstract: | Due to their unique molecular structure, carbon nanotubes exhibit outstanding properties. They are regarded as ideal reinforcements of composites. In this paper, the effects of pinhole defects on mechanical properties are investigated for wavy carbon nanotubes based nanocomposites using 3-D Representative Volume Element with long carbon nanotubes. The carbon nanotubes are modeled as continuum hollow cylindrical shape elastic material with pinholes, having some curvature in its shape. These defects are considered on the single walled carbon nanotubes. The mechanical properties like Young’s modulus of elasticity are evaluated for various values of waviness index, as well as type and number of pinhole defects. The effects of interactions between both defects as well as their influence on the nanocomposites are studied under an axial loading condition. Numerical equations are used to extract the effective material properties for the different geometries of Representative Volume Elements with non-defective carbon nanotubes. The finite element method results obtained for non-defective carbon nanotubes are consistent with analytical results for cylindrical Representative Volume Elements, which validate the proposed model. It is observed that the presence of pinhole defects as well as waviness, can significantly reduces the effective reinforcement, when compared with nanotubes without pinhole defects and this reinforcement decreases with the increase of the number of pinhole defects. |
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