| Project/Area Number |
16K05966
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | University of Tsukuba |
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Principal Investigator |
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
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| Keywords | ポアソン比 / CFRP / 複合材料 / 非弾性 / マルチスケール / 機械材料・材料力学 / 複合材料・物性 |
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| Outline of Final Research Achievements |
In this study, we have succeeded in demonstrating occurrence and increase of negative Poisson’s ratios of CFRP laminates in inelastic regions, using a direct measurement technique based on high-accuracy 3-dimensional digital scanning. Comparing the measurement results with the computational results of the homogenization analysis method developed by us, we have confirmed the validity of our analysis method. Moreover, we have developed an inelastic macroscopic constitutive model which can reproduce the negative Poisson’s ratios, and implemented it in commercial finite element analysis software. Using it, we have considered applications of the negative Poisson’s ratios of CFRP laminates.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究成果は，CFRP積層板が負のポアソン比を呈するとともに，その絶対値が非弾性変形の進行とともに増大していくという特異な現象を示すことを世界で初めて実測したものであり，当該分野にインパクトを与える学術的意義の高い成果と言える．また本研究成果では，この特異な現象を，一般に用いられている汎用有限要素解析ソフトウェアにより簡便に解析できる手法を開発することにも成功しているから，その応用開発や複合材構造設計の高度化につながる社会的意義のある成果と言える．
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