巻号一覧
31 巻, 1 号
選択された号の論文の9件中1～9を表示しています
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石川 隆司2005 年 31 巻 1 号 p. 1-4
発行日: 2005/01/15
公開日: 2009/08/11
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岡部 朋永2005 年 31 巻 1 号 p. 5
発行日: 2005/01/15
公開日: 2009/08/11
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破壊力学は複合材料強度設計に使えるか影山 和郎2005 年 31 巻 1 号 p. 6-12
発行日: 2005/01/15
公開日: 2009/08/11
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野村 学, 和田 薫, 濱田 泰以2005 年 31 巻 1 号 p. 13-20
発行日: 2005/01/15
公開日: 2009/08/11
ジャーナル フリーGlass fiber reinforced plastics are used as important industrial materials. Generally the role of GF is a reinforcement of plastics.But recently new concept is suggested that the GF itself to be a structural element. The injection expanded molding is an example.It combines spring-back force of long fiber and core-back technology at injection mold to get the light and rigidity structure.In this paper mechanical properties and the structure of the injection expanded mold of GFPP are investigated.The structure of expanded mold consists of an unexpended layer of surface and an expanded layer inside.This expanded mold has higher rigidity than rib structure with high impact strength.The new method that fiber is used for the structure element of mold is confirmed to be useful.抄録全体を表示PDF形式でダウンロード (4649K) -
加藤 久弥, 下河 利行, 上田 享, 濱口 泰正, 小林 大祐2005 年 31 巻 1 号 p. 21-30
発行日: 2005/01/15
公開日: 2009/08/11
ジャーナル フリーIn this study CAI (Compression After Impact) strength of a carbon/tough-polyimide composite material, MR50K/PETI5, where PETI5 resin was newly developed for the next generation SST at NASA was investigated. First, impact damage was given to CAI specimens at room temperature and the load response was measured during the impact test and the damage of the specimens was observed by an ultra sonic C-scanner and 3-D ultrasonic inspection system. Second, CAI strength and failure strain at room and high temperatures were measured. Third, the damage caused by the CAI test was observed using an optical microscope. Test results are compared with those of T800H/PMR-15 carbon/polyimide composite, where PMR-15 is a typical brittle resin, and the characteristic CAI behavior and strength of a carbon fiber/highly-tough resin composite was clarified.抄録全体を表示PDF形式でダウンロード (7773K) -
横関 智弘, 青木 隆平, 石川 隆司2005 年 31 巻 1 号 p. 31-37
発行日: 2005/01/15
公開日: 2009/08/11
ジャーナル フリーMatrix cracking behavior in multiple plies of composite laminates was experimentally investigated using [0/θ2/90]s CFRP laminates with θ=30, 45 and 60. Detailed accumulation process of matrix cracks in each ply was observed within the static tension test program by X-ray transmission and CT scanning techniques. In the case of [0/602/90] s specimens, numerous 60-ply micro cracks were induced by 90-ply crack initiation, while 30-ply cracks in [0/302/90] s specimens appeared as cracks propagating in the fiber direction. In addition, the micro cracks in 60-ply rarely extended in the fiber direction even at high strain levels. Finally, discussions on the formation of micro cracks in θ-ply were provided in terms of energy release rates associated with θ-ply crack propagation including the influence of 90-ply cracks.抄録全体を表示PDF形式でダウンロード (3208K) -
成田 吉弘2005 年 31 巻 1 号 p. 38-44
発行日: 2005/01/15
公開日: 2009/08/11
ジャーナル フリーA concept of a layerwise optimization (LO) approach, previously proposed by the author, is extended to be combined with the finite element method (FEM) and this combined approach for structural optimization, named LO-FEM approach, is demonstrated to obtain the optimum performance of symmetrically laminated composite plates. Design variables are taken to be the fiber orientation angles in all K layers. This usually causes a rapid increase in computation time due to the search for optimum solutions in the K dimensional space. The LO makes it possible, however, that this multi-dimensional optimization problem reduces into only K times repetition of onedimensional search. In the FEM formulation, the stiffness matrix is modified to be suited for the LO procedure. The numerical examples show that the LO-FEM approach is a quite effective tool to obtain the minimum deflection in the bending problem and the maximum frequency in the vibration problem.抄録全体を表示PDF形式でダウンロード (3301K) -
末益 博志2005 年 31 巻 1 号 p. 45-46
発行日: 2005/01/15
公開日: 2009/08/11
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濱田 泰以2005 年 31 巻 1 号 p. 46-48
発行日: 2005/01/15
公開日: 2009/08/11
ジャーナル フリーPDF形式でダウンロード (2941K)
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