巻号一覧
42 巻, 5 号
選択された号の論文の10件中1～10を表示しています
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遠藤 順一, 室田 忠雄1992 年 42 巻 5 号 p. 257-262
発行日: 1992/05/30
公開日: 2008/10/30
ジャーナル フリーPlastic deformation of an extruded aluminum H-beam was investigated under an unsymmetrical bending condition. The deformation of the cross-section under unsymmetrical bending was characterized through comparison with the deformation under symmetrical bending and pure twisting conditions. An H-beam specimen was set with the web axis inclining by ψ degree from the bending plane (the horizontal plane). Then, bending moment was applied on the H-beam specimen using a cantilever type bending apparatus modified to fit for unsymmetrical bending. Both the transverse bending moment and twisting moment caused by the in-plane unsymmetrical bending were measured. The deformation of the cross-section was also determined. When the web plane coincided with the bending plane (symmetrical bending) the web of an H-beam was not deformed. However, the flange showed sagging deformation. When the web plane was perpendicular to the bending plane, the web was deformed into a shape of a character "C". The flangs was only rotated around the junction between the web and flange. Under unsymmetrical bending, the web was deformed into a shape of a character "S", while the flange deformation was a combination of the sagging and rotation. When the inclination angle ψ was small the sagging deformation of the flange was predominant. On the contrary, the rotation of the flange was predominant when the inclination angle ψ became close to 90°. These results are utilized for preventing the deformation of the cross-section under unsymmetrical bending.抄録全体を表示PDF形式でダウンロード (908K) -
矢嶋 保, 岩原 弘育, 武津 典彦, 大橋 照男, 小出 邦博1992 年 42 巻 5 号 p. 263-267
発行日: 1992/05/30
公開日: 2008/10/30
ジャーナル フリーIn order to carry out in-situ measurement of hydrogen content in molten aluminum, a galvanic cell type hydrogen sensor was constructed using CaZr0.9In0.1O3-α as a solid electrolyte. This sensor exhibited stable electromotive force (emf) corresponding to hydrogen content (S). A linear relation was found between emf and logarithm of S2. The hydrogen content determined by this sensor was in good agreement with that measured by Telegas method.抄録全体を表示PDF形式でダウンロード (530K) -
大崎 修平, 高橋 恒夫1992 年 42 巻 5 号 p. 268-273
発行日: 1992/05/30
公開日: 2008/10/30
ジャーナル フリーLife time to stress corrosion cracking (SCC) of an aluminum alloy A7075-T6 in 3.5%NaCl solution or in pure water was measured under a stress along short transverse direction. SCC process is divided into crack initiation stage and crack propagation stage, and each stage is analyzed by the Weibull's distribution method. In NaCl solution the life time for each stage can be described by a composite Weibull's distribution. The shape parameter of mode 1 in the region with shorter life time is larger than unity, and that of mode 2 in the region with longer life time is close to unity. On the other hand, the life time in pure water follows a single Weibull's distribution with the shape parameter around unity. An average life time is smaller in NaCl solution than in pure water by a factor of 2 to 4. In SCC process of mode 1 in NaCl solution, cracks nucleate at the intergranular corrosion pits.抄録全体を表示PDF形式でダウンロード (780K) -
穴田 博, 山本 恭弘, 中田 博之, 多田 静夫1992 年 42 巻 5 号 p. 274-280
発行日: 1992/05/30
公開日: 2008/10/30
ジャーナル フリーAluminum composite pipes reinforced with stainless steel nets were fabricated in the following procedure. A mould core was first prepared by a graphite bar wrapped with both stainless steel nets and aluminum foils. Hollow shaped billets were made using a unidirectional solidification technique after pouring aluminum melt into the mould having the core. Then, the hollow shaped billets were extruded into composite pipes using a mandrel. Aluminum foils used with nets were useful for positioning nets, adjusting spacing between net layers and improving melt filling into billets. The original shape was maintained even after extrusion without failure. The torsional properties of the pipe were improved by adjusting the radial position of nets and by increasing the wrapping number of nets.抄録全体を表示PDF形式でダウンロード (1393K) -
小林 信雄, 黒田 周, 大西 忠一, 市之瀬 弘之1992 年 42 巻 5 号 p. 281-286
発行日: 1992/05/30
公開日: 2008/10/30
ジャーナル フリーStrength and corrosion resistance of an extruded Al-8%Fe P/M alloy has been investigated. Corrosion tests were carried out in a 3.5% NaCl aqueous solution kept at 40°C. Almost no change in the microstructure and strength was observed after heating up to about 400°C, while coarsening of structure and softening occurred above 400°C. The corrosion rate became minimum at a heating temperature of 200°C. The corrosion rate of as-extruded alloy was high in the early stage of corrosion, probably because of the residual stress. Since the residual stress is released by the pitting corrosion, the corrosion rate decreases in the later stage. The high corrosion rate observed after heating at higher temperature is considered to be due to the coarsening of structure and the increase in electrochemical nonuniformity.抄録全体を表示PDF形式でダウンロード (1015K) -
中江 秀雄, 宋 基敬, 藤井 英俊1992 年 42 巻 5 号 p. 287-292
発行日: 1992/05/30
公開日: 2008/10/30
ジャーナル フリーThe change in Si phase morphology at the solid/liquid interface by addition of Sr was observed using an improved unidirectional solidification method to investigate the mechanism of modification of Al-Si alloys. A self sealing method was used to prevent Sr from evaporating and oxidizing. Al-Si alloy was best aligned at a speed of 2mm/h and Sr addition worsened the degree of alignment. As the solidification rate decreased, the degree of interfacial smoothness also decreased in Al-Si-Sr alloy, while it increased in Al-Si alloy. Si phase protruded into the liquid phase in Al-Si-Sr alloy, although Si phase was covered by α phase in Al-Si alloy. That phenomenon was caused by the change in the balance between α phase/liquid interfacial energy and Si phase/liquid interfacial energy. The equilibrium condition was achieved by holding the furnace stationary for 5hours.抄録全体を表示PDF形式でダウンロード (1404K) -
山本 祐嗣, 井沢 一, 落合 庄治郎, 長村 光造1992 年 42 巻 5 号 p. 293-298
発行日: 1992/05/30
公開日: 2008/10/30
ジャーナル フリーUsing a porous body of silicon carbide which forms a three-dimensional network structure, SiC-aluminum composites were prepared by the liquid phase hot-pressing technique: the porous SiC was infiltrated with molten aluminum under pressure. Each of silicon carbide and aluminum forms a three-dimensional network structure intermingling with each other and the composite shows the following unique properties compared with conventional aluminum matrix composites. The composites are macroscopically isotropic. The compressive strength is 1.2GPa at room temperature and this value is retained up to 473K. Beyond 473K, it decreases gradually with increasing temperature to 0.5GPa at 673K. The bending strength and coefficient of thermal expansion are 480 MPa and 7.5 × 10-6/K, respectively. The Young's modulus is isotropically 230GPa. This value is higher than that of isotropic particle-dispersed aluminum composite, and comparable with that of fiber-reinforced aluminum composite in longitudinal direction but higher than that in transverse direction.抄録全体を表示PDF形式でダウンロード (1159K) -
井上 明久, 増本 健1992 年 42 巻 5 号 p. 299-305
発行日: 1992/05/30
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (1779K) -
柴柳 敏哉, 堀 茂徳1992 年 42 巻 5 号 p. 306-315
発行日: 1992/05/30
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (3411K) -
菅沼 克昭1992 年 42 巻 5 号 p. 316-318
発行日: 1992/05/30
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (313K)
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