実験力学
Print ISSN : 1346-4930
ISSN-L : 1346-4930
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論文
  • Toru SAWAI, Satoru MIZUNO, Hiroki IMAMURA
    原稿種別: 研究論文
    2021 年 21 巻 1 号 p. 16-22
    発行日: 2021/04/10
    公開日: 2021/05/02
    ジャーナル フリー

    It is expected that conventional petroleum-based plastic will be replaced with biomass-based plastic to solve the issues of the global environment. To provide the dimensional stability of biomass-based plastics, the torrefaction treatment is conducted to reform the hydrophile property of woody biomass. There are two objectives of the study. One is to investigate the effect of torrefaction on thermal softening properties of wood powder. The other is to clarify the optimum mass yield conditions which simultaneously satisfy both water resistance and bending strength of extruded wood molding. The following results are obtained: (1) As the mass yield decreases, the softening temperature increases, which is related to the thermal decomposition of hemicellulose contained in woody biomass. (2) The torrefied wood powder has the non-Newtonian flow property of pseudo-plastic fluid. The mass yield has a large effect on apparent viscosity especially at low temperature conditions. (3) The decrease in the mass yield improves the hydrophobic property, but reduces the bending strength of extruded wood molding. From the result of the trade-off relationship between hydrophobic property and bending strength against mass yield, it is found that the optimum mass yield is around 0.9.

  • 高 岡 大 造, 田 中 幸 徳, 森 幸 治, 飯 田 裕 貴, 井 端 な な こ
    原稿種別: 研究論文
    2021 年 21 巻 1 号 p. 23-29
    発行日: 2021/04/10
    公開日: 2021/05/02
    ジャーナル フリー

    In order to develop an efficient water purification method using microbial fuel cells (MFCs), we experimentally investigated not only the time history of the electrical output and the I-V characteristics of MFCs with external resistance of 100Ω and 1000Ω, but COD changes of the artificial waste water whose types were set to acetic and butyric acid. There was almost no electrical output at the beginning of the experiment. The MFCs, however, had the electrical output as the experiment progresses since there were microorganisms that generate electricity. In addition, the electrical output of 100Ω was higher than that of the external resistance of 1000Ω. At this time, there was a correlation between the value of the electric output and the rate of decrease of COD, and the correlation becomes stronger when the electric output was high. Finally, it was confirmed that the value of the external resistance that maximizes the electrical output changes according to the state of the MFC cell. From the above results, it has been shown that controlling the external resistance to maximize the electrical output may accelerate the rate of COD reduction.

論文
  • 寺 野 元 規, 吉 野 雅 彦, 上 野 貴 之
    原稿種別: 研究論文
    2021 年 21 巻 1 号 p. 30-34
    発行日: 2021/04/10
    公開日: 2021/05/02
    ジャーナル フリー

    Metal nanodot arrays have unique optical characteristics. And they are expected to find applications in biosensors and optical devices. The authors are proposing that simple and efficient manufacturing processes are introduced for metal nanodot arrays. These processes are based on the combination of thin metal film coatings deposited on substrates and thermal self-aggregation. In this paper, we aim to observe thermal self-aggregation process by using in-situ SEM observation technique with heating stage. And we also study influence of nano plastic forming on thermal selfaggregation process. As results, we showed the follows: (1) In the observation of thermal self-aggregation process of Au nanodot arrays, thin Au films, which deposited on a quartz glass substrate by using a spatter coater, was separated into many pieces of complicated island shapes. Separated Au with island shape was aggregated into round dot shape. (2) When thin Au film was grooved by nano plastic forming, separation of the film proceeded from the fabricated groove. And nano Au structures were aligned in a groove pattern. Nano plastic forming was effective for controlling the thermal self-aggregated shape of thin Au film.

  • 小 島 朋 久, 中 村 匠, 辻 知 章, 納 冨 充 雄, 藤 谷 博 人
    原稿種別: 研究論文
    2021 年 21 巻 1 号 p. 35-40
    発行日: 2021/04/10
    公開日: 2021/05/02
    ジャーナル フリー

    Recently, numerous researches have been conducted with gel materials which are soft materials expecting it to be applied to biomimetic robots, soft actuators, and organ models for operation training. However, since the gel is very soft, it is difficult to measure and evaluate the deformation characteristics. This study is a part of the research project which is to develop an experimental system with a human head model that can simulate and measure the strain in the deep brain to clarify the mechanism of sports concussion. In this study, we propose a measuring technique for the strain inside a transparent gel by applying the particle image velocimetry and digital image correlation. Using the laser light sheet, the motion of the tracer particles which is mixed in the gel were visualized at an arbitrary cross-section. Then substituting the random pattern to the visualized particles in the digital image correlation, the strain distribution of the cross-section was obtained. The obtained strains were validated with engineering strain. Consequently, it was shown that the strain distribution in the gel could be accurately measured though it included some error in the vicinity of the edge of the measurement region.

  • 原 卓 也, 藤 垣 元 治, 不 破 佑 哉, 杉 山 隼 紀, 宮 島 拓 也, 河 尻 留 奈, 鈴 木 啓 悟
    原稿種別: 研究論文
    2021 年 21 巻 1 号 p. 41-48
    発行日: 2021/04/10
    公開日: 2021/05/02
    ジャーナル フリー

    A sampling moire method is applied to a displacement and rotation angle measurement. The accuracy of phase difference analysis using the sampling moire method is from 1/100 to 1/1000 of the grating pitches. 2D phase distributions of the 2D grating are also obtained with the sampling moire method. 2D phase difference before and after the deformation gives the displacement at the point and the 2D phase also gives the coordinates at the point because the grating pitch is known. Authors proposed an analysis method of a rotation angle from the 2D phase difference distribution and the 2D phase distribution. In this paper, a synchronous measurement system for laser displacement meter and camera was built. It was applied to the dynamic deformation measurement of a road bridge. The results were compared with the results of laser displacement meter. It was confirmed that laser displacement meter and camera measurement results were synchronized. It was confirmed that the time series measurement system can measure dynamic displacement and rotation angle of a road bridge.

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