巻号一覧
40 巻 (2014)
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40 巻, 1 号
選択された号の論文の4件中1～4を表示しています
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研究論文
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岡 功介, 池田 忠繁, 仙場 淳彦, 上田 哲彦2014 年 40 巻 1 号 p. 10-16
発行日: 2014年
公開日: 2015/02/28
ジャーナル フリーA design method for an embroidery-based TFP (tailored fiber placement) was proposed, in which fiber bundles were placed along desired directions by an embroidery machine. To verify availability of the method a CFRP laminate plate optimized for a bending-torsion problem was processed and they were evaluated by the calculation and the experiment. Result showed that the stiffness of the plate could be improved by the TFP both in the calculation and the experiment although the difference between them was significant quantitatively. It was found from discussions that consideration of damage of the fiber bundles plays important roles on prediction of the properties of composites with the TFP layers.抄録全体を表示PDF形式でダウンロード (2178K) -
山下 慎一郎, 大澤 勇, 髙橋 淳2014 年 40 巻 1 号 p. 17-24
発行日: 2014年
公開日: 2015/02/28
ジャーナル フリーNovel CFRTPs (carbon fiber reinforced thermoplastics) for mass production automobile have been developed in Japanese METI-NEDO project (2008–2012 fy). These CFRTPs show not only high mechanical properties, high cycle moldability, high recyclability, but also excellent energy absorption capacity. This ductility is caused because these CFRTPs are difficult to delaminate. Hence, in this paper, how this characteristic works against lightning strike is investigated. We use CMT (carbon fiber mat reinforced thermoplastics) and examine the basic fracture behavior under artificial lightning strike by using impulse current generator. The fracture behavior is observed by high-speed camera and the waveform of lightning is measured by Rogowski coil. Moreover, the damages to the CMT specimens are observed visually by video-microscope and X-ray imaging. The test results showed that the damages of CMT under lightning strike are divided into three areas, named as fiber burned area, resin melted area, and heat affected zone. The sizes of these damage areas showed strong correlation with joule heat generated by the impulse current generator. In addition, it is confirmed that delamination did not occur against lightning strike. Therefore, the resistance to delamination of CFRTP is superior to CF/EP (carbon fiber reinforced epoxy) from the viewpoint of structural integrity after lightning strike.抄録全体を表示PDF形式でダウンロード (3856K) -
松崎 亮介, 瀬戸 大悟, 轟 章, 水谷 義弘2014 年 40 巻 1 号 p. 25-34
発行日: 2014年
公開日: 2015/02/28
ジャーナル フリーIn resin transfer molding (RTM), the void content measured after resin curing does not represent the amount of voids at the point of air-trapping. To properly verify a prediction model for the void content based on the occurrence of voids due to the air-trapping mechanism, the void content must be measured immediately at the point of air-trapping. In the present study, we created an in-situ method for measuring the void content during resin impregnation by combining image analysis with a technique that visualizes the resin flow and void formation during one-dimensional RTM. Using this proposed method, we measured changes in the distribution of the void content at the air-trapping site and following resin curing. As a result, an inversion phenomenon was observed, in which the void content decreased a short distance from the resin inlet due to the time that elapsed, whereas it increased at a longer distance. This phenomenon can be explained by the ease with which the void moved and by the effect of molecular diffusion. In addition, by measuring the change in void content during the time that elapsed from air-trapping until resin curing, we clarified the behavior of the void change and the factors that affect the void content following void formation.抄録全体を表示PDF形式でダウンロード (2544K) -
米山 聡, 小柳 潤, 有川 秀一2014 年 40 巻 1 号 p. 35-43
発行日: 2014年
公開日: 2015/02/28
ジャーナル フリーIdentification of in-plane and through-thickness material properties of a unidirectional carbon fiber reinforced plastics (CFRP) plate from displacement fields is performed using a virtual fields method. The displacement fields are obtained through the measurement using digital image correlation. In order to obtain appropriate identification results, the measured displacements are reasonably smoothed and the optimized virtual displacement fields are determined for minimizing the influence of the measurement errors. The material properties are determined by applying this method to the displacement fields obtained for the beam specimen under three-point bending. Results show that the orthotropic material properties can be identified from the measured displacement fields. As the orthotropic material properties are obtained from measured displacement distributions, this method is expected to be applied to various materials.抄録全体を表示PDF形式でダウンロード (2472K)
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