| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Outline of Final Research Achievements |
To enable the development of multiwalled carbon nanotubes (MWCNTs) with superior mechanical properties, the structural-mechanical property relationships of MWCNTs were investigated. We showed that the nominal (engineering) tensile strength was written as a product of the fracture strength (effective strength) and fracture cross-section ratio that were calculated by the fracture cross-sectional area divided by the full cross-sectional area including the hollow core.
The axial coefficient of thermal expansion (CTE) of the MWCNTs was computed by using the Young’s modulus of the MWCNTs and CTE of the aligned MWCNT reinforced epoxy composites in rule of mixture, and the effects of the diameter and crystallinity of MWCNTs on the axial CTE were investigated. We demonstrated by thermal expansion testing that the MWCNTs were shown to possess negative CTEs, and the CTEs tended to become less negative with increasing diameter and crystallinity.
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