巻号一覧
36 巻 (2010)
- 6 号 p. 222-
- 5 号 p. 179-
- 4 号 p. 129-
- 3 号 p. 94-
- 2 号 p. 33-
- 1 号 p. 4-
36 巻, 2 号
選択された号の論文の3件中1～3を表示しています
- |<
- <
- 1
- >
- >|
研究論文
-
小笠原 俊夫, 石川 隆司2010 年 36 巻 2 号 p. 33-40
発行日: 2010年
公開日: 2011/02/25
ジャーナル フリーA new test method (NAL-II) for evaluating compressive properties of carbon fiber composites (CFRP) was proposed in this study. The compressive tests based on ASTM D6641 and NAL-II methods were conducted for three kinds of quasi-isotropic composite laminates (T800/3633, T800S/3900-2B, and IM600/133) for direct comparison. The stress-strain curves including compressive modulus obtained by NAL-II method were agreed with those obtained by ASTM D6641. NAL-II methods gave slightly greater compressive strengths (approximately 10%) as compared with ASTM D6641, it would be due to suppression of bending (buckling) before failure. The experimental result suggests the NAL-II method has a potential for domestic and/or international standard test method for non-hole compressive strength of carbon fiber composite laminate.抄録全体を表示PDF形式でダウンロード (2150K) -
邉 吾一, 松田 匠, 上野 雄太2010 年 36 巻 2 号 p. 41-47
発行日: 2010年
公開日: 2011/02/25
ジャーナル フリーDisposing conventional FRPs poses environmentally challenging problem. When FRPs are scrapped by combustion, carbon dioxide is discharged in the air because the resin of FRPs is made of fossil fuel. When they are disposed in the ground, FRPs remain semi-permanently without decomposing. In response to these problem, green composites now being developed and are extensively studied as a material of less environmental burden. In this paper, a pultrusion technique was developed for fabricating green composites composed of PLA (Poly Lactic Acid) or PBS (Poly Butylene Succinate) resin as a matrix and kenaf fibers as reinforcement. Their tensile strengths under the different temperatures were examined. These results were compared with those fabricated with a hot press molding. As a result, the performance of pultrusion method which could continuously fabricate green composites was demonstrated here and their tensile strength and Young's modulus of PLA/kenaf and PBS/kenaf composites were larger than those of both resins alone under the different temperatures. This result showed the reinforcement effect of PLA and PBS by kenaf fibers at the room and the higher temperatures. Furthermore, the tensile strength and Young's modulus with the pultrusion method were larger than those with the hot press method, because the tension applied to the fiber bundles during the pultrusion molding. The heat resistance of the PBS/kenaf composite was higher than that of PLA/kenaf composite. Finally, another shape of green composite was fabricated by using the specimen of pultrusion method and its properties were evaluated.抄録全体を表示PDF形式でダウンロード (2328K) -
坂田 憲泰, 邉 吾一, 豊田 充洋2010 年 36 巻 2 号 p. 48-54
発行日: 2010年
公開日: 2011/02/25
ジャーナル フリーCFRP pressure vessels are used as the hydrogen storage system of fuel cell vehicles (FCV). FCV must drive a distance of at least 500 km in comparison with today's gasoline-fueled vehicles. Therefore, the storage pressure of hydrogen is raised from 35 to 70 MPa. This paper presents a method how to increase the burst pressure of CFRP pressure vessels. For increasing the burst pressure of the CFRP pressure vessel, the shape memory alloy (SMA) fiber memorized a compressive stress is wound around the outer surface of cylindrical part of the CFRP pressure vessel. When the CFRP pressure vessel is received the internal pressure, its circumferential tensile stress is reduced by the compressive stress of the SMA fiber and it leads to increase of the burst pressure of the CFRP pressure vessel. The experimental behavior of the CFRP pressure vessel under internal pressure is compared with numerical results and they agree well each other. Furthermore, optimum design of the CFRP pressure vessel by the change of winding method of SMA wire is numerically obtained. For confirming the optimum winding method of SMA wire, confirmation experiments were done.抄録全体を表示PDF形式でダウンロード (1635K)
- |<
- <
- 1
- >
- >|