巻号一覧
31 巻, 8 号
選択された号の論文の15件中1～15を表示しています
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山口 章三郎1975 年 31 巻 8 号 p. P228-P233
発行日: 1975/08/10
公開日: 2008/11/28
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田中 久一郎1975 年 31 巻 8 号 p. P234-P241
発行日: 1975/08/10
公開日: 2008/11/28
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田原 省吾, 宇都宮 徹1975 年 31 巻 8 号 p. P242-P246
発行日: 1975/08/10
公開日: 2008/11/28
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田部井 清1975 年 31 巻 8 号 p. P247-P252
発行日: 1975/08/10
公開日: 2008/11/28
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坂奥 喜一郎1975 年 31 巻 8 号 p. P253-P264
発行日: 1975/08/10
公開日: 2008/11/28
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児玉 峯一1975 年 31 巻 8 号 p. T289-T296
発行日: 1975/08/10
公開日: 2008/11/28
ジャーナル フリーViscoelastic properties of epoxy resins reinforced with random-planar orientation of short glass and carbon fibers were studied in relation to the dependence on the fiber length, fiber content in the composites, and the mixing ratio of a particulate to the glass fiber.
Although the composites reinforced with glass fiber of 0.05mm in length shows only one dispersion (α) corresponding to the primary transition of matrix resin, those reinforced with 3 and 10mm glass fibers show an additional dispersion (α′) which appears above the α dispersion temperature. The composite reinforced with 3mm carbon fiber (resinous pitch) does not show the α′ dispersion. Intensity of the α′ dispersion increases with fiber content. The α′ dispersion is considered to arise from friction or slippage among fibers and/or appears more evidently for composite having stronger interaction between fiber and matrix resin. For the composites reinforced with mixture of 10mm glass fiber and particulate (milled glass fiber), the negative slope of the doubly logarithmic plot of relaxation spectrum and activation energy of relaxation increase with the content of particulate. From these facts it is concluded that the interaction between reinforcing material and matrix resin decreases with increase of the content of particulate for the composite reinforced with mixture of particulate and short fiber.抄録全体を表示PDF形式でダウンロード (518K) -
中田 栄一, 鈴木 鎮夫, 井沢 紀久, 松原 弘美1975 年 31 巻 8 号 p. T296-T305
発行日: 1975/08/10
公開日: 2008/11/28
ジャーナル フリーThe tensile strength of the aluminum tungsten fiber composite by the foil metallurgy technique and the aluminum graphite fiber composite by the high pressure casting technique were measured at the room and high temperature (450°C).
The aluminum tungsten fiber composite metal was made by the 17.3μ thickness aluminum foil and the 96μ, 16.8μ diameter tungsten fibers. The tensile strength and the young's modulus of these composites were measured at the room temperature. The fracture surfaces were observed by the electron scanning microscope.
The tensile strength of the aluminum carbon fiber composite metals (carbon fiber volume fraction: 5%, 8% and 16%) were measured at the temperature range from room temperature to the 450°C. Then the fractured surfaces were also observed.
The continuous tungsten fiber composite was excellent at the high temperature as expected from the rule of composite, but the tensile strength of the carbon fiber composite was not enough to the calculated value from the rule of composite.
The effective and economical production technique of the fiber reinforced metals are not yet found in this report.抄録全体を表示PDF形式でダウンロード (5257K) -
四方田 重昭, 小野 昌孝, 牧 広1975 年 31 巻 8 号 p. T306-T310
発行日: 1975/08/10
公開日: 2008/11/28
ジャーナル フリーA method was devised to determine the fiber content in Fiber Reinforced Plastics (FRP) by the microwave technique and the result was as follows:
The fiber content in Carbon FRP (CFRP) and Glass FRP (GFRP) could be determined from the transmission loss of microwave with a high accuracy. The relation between the fiber content and the transmission loss of microwave in the case of GFRP differed from that of CFRP. The fiber content of CFRP having more than 10 plies of carbon cloth could not be measured by this technique due to the larger transmission loss of CFRP.
The fiber content could be measured by this method when the resin in FRP was not only solid, but also in liquid.抄録全体を表示PDF形式でダウンロード (356K) -
川津 幸雄, 乗田 敏毅, 藤原 元三1975 年 31 巻 8 号 p. T311-T316
発行日: 1975/08/10
公開日: 2008/11/28
ジャーナル フリーThe static fatigue behavior of carbon fiber (“Torayca” T300) strands impregnated with an epoxy matrix has been studied comparing with E-glass fiber strands.
The test results indicate that carbon fiber strands have much higher static fatigue resistance than glass fiber strands, and carbon fiber strands sustain the 85% loading of static ultimate strength for more than 104 hr without loss of tensile strength.抄録全体を表示PDF形式でダウンロード (1671K) -
鎌田 佳伸1975 年 31 巻 8 号 p. T317-T323
発行日: 1975/08/10
公開日: 2008/11/28
ジャーナル フリーThe effective thermal conductivity of composite materials can be calculated when the temperature distribution in the body is known.
The present paper deals with a numerical analysis on the effective thermal conductivity of filament assembly, where the filaments lie in parallel and at regular intervals with each other. In this case, a filament of circular cross section surrounded by matrix can be considered as a unit model of rectangular profile. Further, it is assumed that two surfaces of the model are isothermal and opposite to each other in parallel to the filament axis, and that residual others are insulated. Then a quarter of the model can be used as an element. The mumerical analysis is applied to this model as the two-dimentional steady state heat conduction problem, and the procedure is as follows:
(1) To replace the element under consideration by a various rectangular-grid network.
(2) Calculation of the temperature distribution in the element by means of the so-called iteration method.
(3) Calculation of the effective thermal conductivity using the rates of heat flow in and out across the isothermal surfaces of the element.
From the method described above, a new result is obtained. The value K/Km of the filament assembly composed of circular filaments lying in a line and in contact with two opposite isothermal surfaces may be expressed by the following equation:
K: Effective thermal conductivity of filament assembly Ks: Thermal conductivity of a filament Km: Thermal conductivity of matrix f: Filament volume fraction
This equation will be confirmed in the experiments in the succeeding paper.抄録全体を表示PDF形式でダウンロード (427K) -
佐藤 紀夫, 酒井 哲也, 久世 栄一1975 年 31 巻 8 号 p. T323-T328
発行日: 1975/08/10
公開日: 2008/11/28
ジャーナル フリーThe thermal expansion coefficients were measured for epoxy resin composites containing glass spheres, glass short fibers, both of which were randomly distributed, unidirectional glass fibers and laminated glass colths.
The effect of the shapes of fillers on the thermal expansion of composites were studied. The relation between thermal expansion coefficients and volume fractions of fillers were strongly affected by the shapes and the direction of fillers. The composite effect increased in the order, sphere, short fiber and unidirectional fiber as fillers and the thermal expansion coefficients were found to decrease in this order. The dependence of the thermal expansion on temperature was found remarkably in the glass sphere-epoxy resin composite but it was not found in the glass short fiber- and unidirectional glass fiber-epoxy resin composites.
Thermal hysteresis effect was observed in the glass sphere-epoxy resin composite but it was not observed in the glass short fiber- and unidirectional glass fiber-epoxy resin composites.抄録全体を表示PDF形式でダウンロード (379K) -
高橋 利禎, 北川 昇, 辻本 石雄1975 年 31 巻 8 号 p. T329-T335
発行日: 1975/08/10
公開日: 2008/11/28
ジャーナル フリーMolecular orientation in the surface layer of extruded nylon 6 film was examined by polymer epitaxy technique. It was confirmed that most of the nylon 6 molecules in the surface layer orient parallel to the machine direction of extruded nylon 6 film. Extruded nylon 6 film was annealed in contact with drawn polytetrafluoroethylene (PTFE), holding their molecular axes at right angle to each other. Polycaprolactone (PCL) was crystallized on the surface of nylon 6, which was removed from the PTFE surface. Molecular axis of overgrown PCL lay perpendicular to the machine direction of nylon 6. This result indicates that molecular axis of nylon 6 rotate 90° from the machine direction to the drawing direction of PTFE.
Cold-drawn polyethylene (PE) was annealed in contact with drawn polyoxymethylene and hot-drawn PE, holding their drawing directions at right angle. It was found that PE molecules in the surface layer also change their molecular axes to the direction of molecular axes of another polymers.
These results can be explained on the basis of meltin-recrystallization mechanism. Oriented nucleus of nylon 6 or PE may be formed at the interface during the annealing process.抄録全体を表示PDF形式でダウンロード (4146K) -
吉田 邦夫, ブディマン グナルソ, 岡山 芳道, 北尾 敏男1975 年 31 巻 8 号 p. T335-T341
発行日: 1975/08/10
公開日: 2008/11/28
ジャーナル フリーA series of composites were prepared by extruding a mechanical mixture of 90 wt-% atactic polystyrene and 10 wt-% graphite fiber. The orientation degree of both components were determined as functions of processing temperature and demension of extruding orifice by two different methods: The degree of orientation of distributing graphite fiber was evaluated by using an X-ray analyzer; while that of matrix polystyrene was determined by a thermal retraction at a temperature above the glass transition temperature. The orientation of filler, obtained from the intensity distribution curve for the azimuthal scanning of 020 reflection, was at least 80% for all samples, whereas matrix polystyrene was almost always randomly oriented in all composite samples. This may be attributed to the difference in the relaxation times for both components, because the filler fiber is much larger and stiffer than the polystyrene molecules at processing temperature. The dynamic mechanical properties of these composites were measured at temperatures from 20 to 120 C. The effect of graphite fiber was evently observed in both storage and loss moduli: The storage modulus was fairly improved and the loss component was also increased in proportion to the increase of the storage modulus by mixing graphite fiber. The former is simply understood as a reinforcing effect of graphite fiber. The latter, however, is difficult to be explained, but possibly may be interpreted in terms of a weak interaction at the interfacial boundaries between both component materials.抄録全体を表示PDF形式でダウンロード (1135K) -
福多 健二, 小野岡 竜三, 北野 武, 長塚 惟宏, 長谷川 澄子1975 年 31 巻 8 号 p. T342-T350
発行日: 1975/08/10
公開日: 2008/11/28
ジャーナル フリーInfluence of the filament number (binding number) in chopped strand on the mechanical properties of polyethylene-glass composites was discussed along with a preliminary investigation on a new molding method for the composite filled with dispersed glass staples.
The results obtained are:
1) When binding number is very small, the flexural strength and flexural modulus become larger.
2) The experimental results for the flexural behavior of composites filled with chopped strands and dispersed staples are nearly equal to the calculated for the modified composite-beam model.
3) In molding with dispersed staples at low pressure composites with large flexural strength and modulus can be obtained.
4) Fundamental data for the production of FRP board with a continuous molding apparatus have been obtained using staple fibers and powdery resins.抄録全体を表示PDF形式でダウンロード (2251K) -
中村 邦雄, 尾崎 晶子, 福島 保治1975 年 31 巻 8 号 p. T350-T356
発行日: 1975/08/10
公開日: 2008/11/28
ジャーナル フリーGlass fiber reinforced plastic (FRP) has several advantages such as higher heat-and chemical-resistance, great insulation and easier formability, especially being lighter and stronger than the metals.
Although varying forms of glass fibers are produced for commercial reinforcements like rovings, chopped strands, mats and woven fabrics, etc., the knitted fabrics have not been produced in spite of their large deformability.
There are some difficulties to knit glass fiber yarns except of the beta-yarn, and no investigation on knit-FRP has yet been reported.
Since the knitted glass fabrics are superior to any other types of materials as a reinforcement, the knit-FRP is expected to be one of the most promising industrial materials by virtue of extremely large deformability.
In the present paper, effect of yarn direction and glass contents of knit-FRP on tensile properties and applicability of the rule of mixture to the results obtained have been investigated by using the plane-knit composed of various diameters of a single fiber.
The strength at break was found to depend on the structure of knitted fabric in FRP, and to increase with the glass content. It is noteworthy that the strength at break takes the maximum value at the wale direction because the knit-FRP has an anisotropic structure. The strength is independent of the other factors, for example number of fabrics, thickness of FRP, etc., but the rule of mixture could be applied. The elongation at break has a constant value at a higher level of ca. 7%.抄録全体を表示PDF形式でダウンロード (450K)
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