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MECHANICAL AND ELECTRICAL PROPERTIES OF CARBON NANOTUBES/UPR NANOCOMPOSITES

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MECHANICAL AND ELECTRICAL PROPERTIES OF CARBON NANOTUBES/UPR...

作者： Toshiaki Natsuki Ken Kurashiki masaharu iwamoto Dept.of Functional Machinery and Mechanics Shinshu UniversityUeda 386-8576Japan Division of Advanced Fibro-Science Kyoto Institute of TechnologyMatsugasaki Sakyo-kuKyoto 606-8585Japan Division of Advanced Fibro-Science Kyoto Institute of TechnologyMatsugasaki Sakyo-kuKyoto 606-8585Japan

＜正＞The carbon nanotubes （ CNT）/unsaturated polyester resin （ UPR ） nanocomposites were fabricated, and their mechanical property, electrical conduction and percolation behavior were investigated experimentally and theoretically. The carbon nanotubes used in this study were those by the chemical vapor deposition （ CVD ） method. Two carbon nanotubes, VGCF （ diameter 150 nm）and VGNF（ diameter 80 nm） , were used. The mechanical damping and storage modulus of the composites were measured using a dynamic mechanical analyzer（ DMA）. Damping factor decreases with an increment of the fiber volume fraction. The electrical conductivity of the nanocomposites was measured as a function of carbon nanotube volume fraction in order to understand percolation behavior. The nanocomposites showed the electrical conductivity with low percolation threshold between 2 vol% and 3 vol%. Moreover, the percolation threshold was examined based on simulation calculations. The critical carbon nanotube volumes fraction is in a good agreement with both the theoretical prediction and the experiment results.

关键词： Carbon nanotubes Nanocotnposite Electrical properties Percolation

Creep and Low Cyclic Behavior of Composites Based on Shape Memory Polymer

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Creep and Low Cyclic Behavior of Composites Based on Shape M...

The Fifth China-Japan-Us Joint Conference on Composite Materials

作者： Takeru Ohki Ken Kurashiki masaharu iwamoto Division of Advanced Fibro-Science Kyoto Institute of TechnologyMatsugasakiSakyo-kuKyoto 606-8585Japan Division of Advanced Fibro-Science Kyoto Institute of TechnologyMatsugasakiSakyo-kuKyoto 606-8585Japan Division of Advanced Fibro-Science Kyoto Institute of TechnologyMatsugasakiSakyo-kuKyoto 606-8585Japan

＜正＞ Recently, shape memory polymer （SMP） as one of functional materials has received much attention and its mechanical properties have been investigated. Shape memory polymer of polyurethane series has the glass transition temperature （Tg） around the room temperature. According to the large change in modulus of elasticity above and below Tg, the SMP material has excellent shape memory effect. In this study, the glass fiber reinforced shape memory polymer was developed for the improvement of the mechanical weakness of SMP bulk and for wider applications. It was clear that the improvement of the resistance to creep and cyclic loading in the composites with SMP was obtained due to reinforcement fiber.

关键词： Shape memory polymer Composite Creep property Cyclic behavior. Fiber weight fraction.

FATIGUE LIFE EVALUATION OF GFRP BY INFRARED THERMOGRAPHY

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FATIGUE LIFE EVALUATION OF GFRP BY INFRARED THERMOGRAPHY

作者： Ken KURASHIKI Daisuke TSURUGA Teruo KIMURA masaharu iwamoto Division of Advanced Fibro-Science Kyoto Institute of TechnologyMatsugasaki Sakyo-ku Kyoto 606-8585Japan Division of Advanced Fibro-Science Kyoto Institute of TechnologyMatsugasaki Sakyo-ku Kyoto 606-8585Japan Division of Advanced Fibro-Science Kyoto Institute of TechnologyMatsugasaki Sakyo-ku Kyoto 606-8585Japan Division of Advanced Fibro-Science Kyoto Institute of TechnologyMatsugasaki Sakyo-ku Kyoto 606-8585Japan

＜正＞Materials show exothermic reaction or endothermic phenomenon, when the load is applied. Cyclic loading lead to temperature rise, if the exothermic reaction is larger than heat radiation and heat transfer to the circumference. A part of the heat accumulates with the number of fatigue cycles in the material. By taking of this phenomenon, we measured the maximum temperature of the specimen surface during fatigue test and obtained temperature rise curve for the fatigue life of the GFRP by the infrared thermography. When the cyclic load is given to the GFRP, the rapid temperature rise is observed in the load start and just before fracture. In this study, the fatigue life evaluation was tried from the initial temperature rise rate. In addition, the similarity with the S - N curve was also examined. It was found that the fatigue damage could be evaluated from initial temperature rise rate of fatigue.

关键词： GFRP Fatigue damage Infrared thermography Damage evaluation Fatigue thermal curve

DEVELOPMENT OF FLEXIBLE SUNDPROOF MATERIAL AND ITS SOUND CHARACTERIZATION

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DEVELOPMENT OF FLEXIBLE SUNDPROOF MATERIAL AND ITS SOUND CHA...

作者： Naoya Kurahashi Ken Kurashiki Kazunari Morimoto masaharu iwamoto Division of Advanced Fibro-Science Kyoto Institute of TechnologyMatsugasaki Sakyo-kuKyoto 606-8585Japan Division of Advanced Fibro-Science Kyoto Institute of TechnologyMatsugasaki Sakyo-kuKyoto 606-8585Japan Division of Advanced Fibro-Science Kyoto Institute of TechnologyMatsugasaki Sakyo-kuKyoto 606-8585Japan Division of Advanced Fibro-Science Kyoto Institute of TechnologyMatsugasaki Sakyo-kuKyoto 606-8585Japan

＜正＞Soundproof materials can be classified into insulation, absorption, vibration isolation, and damping materials according to their functions and application fields. The noise insulation material is especially important in soundproof field, and it has already been used in architectural industry, consumer electronic industry, and so on. However, the insulation ability of material mainly follows a mass rule. Thus the heavy weight materials like concrete, lead and steel board are mainly used in current noise insulation materials. They have the weak points such as heavy weight, thick, hard, and other inconveniences for a free design and in construction side. The fiber reinforced composite material with lightweight and other high performance has been used in a lot of structures as an alternative material of metallic material etc. in the past several decades, and it may also provide a possibility in the soundproof field. In this paper, flexible soundproof materials with different base fabrics and coating polyurethane （PU） hybrid resins were developed. Considering the effectiveness of filling particles to soundproof effect, the PU resins with different silica contents were used. In order to maintain soft features of the materials, the silica particles are selected only to fill into the hard segment of PU resin. Experiments on flexural ability and soundproof performance were conducted. The experimental results indicated that the developed materials have the advantages in lightweight, flexibility, mechanical property and excellent soundproof performance.

关键词： Transmission loss Loop compression Soundproof performance Flexibility Lightweight PU resin

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对称层合板复合材料的屈曲变形解析

复合材料学报 1999年第3期16卷 140-146页

作者：倪庆清岩本正治京都工艺纤维大学

提出了如何利用２元多项式位移函数来分析层合板复合材料的屈曲问题。在解析中同时考虑到层合板的面外剪切变形。解析表明屈曲载荷在多项式项数大于２０以上时趋于稳定，可得到高精度的解。本文并对对称角铺设层合板进行了系统地数值解... 详细信息

提出了如何利用２元多项式位移函数来分析层合板复合材料的屈曲问题。在解析中同时考虑到层合板的面外剪切变形。解析表明屈曲载荷在多项式项数大于２０以上时趋于稳定，可得到高精度的解。本文并对对称角铺设层合板进行了系统地数值解析，明确了在各种边界拘束条件下材料的工程弹性系数，层合板长宽比，铺层数，层合角对屈曲载荷的影响，从而以达到优化设计。同时。

关键词：屈曲载荷压缩剪切变形复合材料层合板

SMA粒子和短纤维填充的复合材料的力学特性

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钢结构 2008年第2期23卷 78-79页

作者： Run-xin Zhang, Qing-Qing Ni, Toshiaki Natsuki and masaharu iwamoto

形状记忆合金(SMAs)由于其可塑的记忆效果,短期弹性、高阻抗容量和其他特性,因而具有感知和激励的功能。利用SMAs独一无二的特性,结合其他材料可用来制造出智能化或灵敏的合成材料。研究利用镍钛合金短纤维和颗粒制造的环氧合成材料的... 详细信息

形状记忆合金(SMAs)由于其可塑的记忆效果,短期弹性、高阻抗容量和其他特性,因而具有感知和激励的功能。利用SMAs独一无二的特性,结合其他材料可用来制造出智能化或灵敏的合成材料。研究利用镍钛合金短纤维和颗粒制造的环氧合成材料的力学性能。由于加入了SMA,SMA/环氧合成材料具有更强的抗弯抗剪能力。特别在高温下,存储系数随着SMA显著增加。试验结果表明,SMA每增加3.5%,存储系数将有显著的增加,影响量级为环氧的6倍。当SMA相变接近120°时,存储系数增大到了最大值。SMA/ER3合成材料的损失因素随着SMA的增加而增加。基于Halpin-Tsai理论,具有SMA的薄层可以代表整个材料动力性能。相对于其他试验材料,在现有模型上得到的结论可以合理地预测这些动力响应。

关键词：形状记忆合金复合物力学特性动力响应

具有形状记忆短纤维合金的SMA/ER3复合物的硬度和振动特性

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钢结构 2008年第2期23卷 78-78页

作者： Qing-Qing Ni, Run-xin Zhang, Toshiaki Natsukic and masaharu iwamoto

形状记忆合金(SMAs)由于其可塑的记忆效果,短期弹性、高阻抗容量和其他特性,因而具有感知执行的功能。结合其他材料可以制造出智能化或灵敏的合成材料。研究了一种在环氧中填充镍钛合金短纤维制造的复合材料。采用数字HF显微镜观察微结... 详细信息

形状记忆合金(SMAs)由于其可塑的记忆效果,短期弹性、高阻抗容量和其他特性,因而具有感知执行的功能。结合其他材料可以制造出智能化或灵敏的合成材料。研究了一种在环氧中填充镍钛合金短纤维制造的复合材料。采用数字HF显微镜观察微结构。通过测量悬臂梁第一个振型和动态力学分析(DMA)方法研究其动力学性能,在理论上预测了SMA合成材料的自然频率。结果表明,SMA短纤维成分的比例对材料的振动特性和DMA特征有很大影响。少量增加SMA短纤维可提高SMA复合材料的振动性能。SMA短纤维重量增加3·5%可导致自然频率和存储系数同时增加达到最大。这表明存在使SMA振动性能达到最佳的适宜的重量百分比。

关键词：形状记忆合金短纤维复合物形状记忆特征力学性能

A Review of Contact Electrification at Diversified Interfaces and Related Applications on Triboelectric Nanogenerator

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Nano-Micro Letters 2024年第1期16卷 106-130页

作者： Jun Hu Mitsumasa iwamoto Xiangyu Chen CAS Center for Excellence in Nanoscience Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083People’s Republic of China School of Nanoscience and Engineering University of Chinese Academy of SciencesBeijing 100049People’s Republic of China Department of Physical Electronics Tokyo Institute of Technology2‑12‑1 S3‑33 O‑OkayamaMeguro‑KuTokyo 152‑8552Japan

The triboelectric nanogenerator(TENG)can effectively collect energy based on contact electrification(CE)at diverse interfaces,including solid–solid,liquid–solid,liquid–liquid,gas–solid,and gas–*** enables energy harvesting from sources such as water,wind,and *** this review,we provide an overview of the coexistence of electron and ion transfer in the CE *** elucidate the diverse dominant mechanisms observed at different interfaces and emphasize the interconnectedness and complementary nature of interface *** review also offers a comprehensive summary of the factors influencing charge transfer and the advancements in interfacial modification ***,we highlight the wide range of applications stemming from the distinctive characteristics of charge transfer at various ***,this review elucidates the future opportunities and challenges that interface CE may *** anticipate that this review can offer valuable insights for future research on interface CE and facilitate the continued development and industrialization of TENG.

关键词： Contact electrification Interfaces Triboelectric nanogenerators Diversified applications

Optical second-harmonic generation measurement for probing organic device operation

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Light(Science & Applications) 2015年第1期4卷 99-108页

作者： Takaaki Manaka Mitsumasa iwamoto Department of Physical Electronics Tokyo Institute of Technology2-12-1 O-okayamaMeguro-kuTokyo 152-8552Japan

We give a brief overview of the electric-field induced optical second-harmonic generation(EFISHG)technique that has been used to study the complex behaviors of organic-based *** analyzing EFISHG images of organic field-effect transistors,the in-plane two-dimensional distribution of the electric field in the channel can be *** susceptibility tensor of the organic semiconductor layer and the polarization of the incident light are considered to determine the electric field *** imaging can effectively evaluate the distribution of the vectorial electric field in organic films by selecting a light *** the time-resolved technique,measurement of the electric field originating from the injected carriers allows direct probing of the carrier motion under device operation,because the transient change of the electric field distribution reflects the carrier *** applications of the EFISHG technique to organic electronic devices are reviewed.

关键词： electric field optical second-harmonic generation semiconductor device