巻号一覧
31 巻 (1993)
- 6 号 p. 324-
- 5 号 p. 264-
- 4 号 p. 192-
- 3 号 p. 114-
- 2 号 p. 58-
- 1 号 p. 3-
前身誌
31 巻, 6 号
選択された号の論文の6件中1～6を表示しています
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佐藤 真一, 山崎 誠一郎, 佐藤 瓊介, 飯尾 真也, 西尾 敏, 多田 栄介, 小畑 清和1993 年 31 巻 6 号 p. 324-334
発行日: 1993/11/25
公開日: 2010/08/05
ジャーナル フリーThe development of locking and unlocking system of in-vessel components such as a blanket module is one of the key issues for the tokamak fusion reactor. The cotter (wedge) mechanism driven by hydraulic pressure is a promising one as the locking and unlocking system in the fusion reactor environment. The idea using the deformation of a thin and flat seamless tube (metallic balloon) has been proposed and we have successfully manufactured the metallic balloon of Titanium alloy by SPF (Super-Plastic Forming). In this paper, we describe the fablicating procedure of the metallic balloon, results of their performance tests and the applicability of the metallic balloon for cotter driving.
Following results are obtained:
1. We have demonstrated that “Superplastic Forming” by Titanium alloy could be applied to this metallic balloon fablication.
2. We have established the design optimization method based on the stress analysis with large deformation such as the metallic balloon.
3. Two kinds of metallic balloon mock-ups were successfully manuf actrued by SPF; the one is 450mm1×40mmh×120mmW×0.5mmt and the other is 1000mm1×-40mmh×160mmW×0.5mmt.
4. By internal pressure tests, it was found that the metallic balloon mockups have enough deformation (about 30mm) within elastic range.
5. As the stroke of the metallic balloon is 20mm, the driving force of 160mm wide mock-up was about 100kN with 1.7MPa of internal pressure.
These results of performance tests indicate the feasibility of metallic balloon as the cotter driving mechanism.抄録全体を表示PDF形式でダウンロード (5786K) -
菱田 博俊, 三牧 敏太郎1993 年 31 巻 6 号 p. 335-341
発行日: 1993/11/25
公開日: 2010/08/05
ジャーナル フリーBurst has not actually been focussed on as a serious problem in a pipeline or a tubing plant, and the principal acknowlegde on a simple burst phenomenon is not enough. Some analyses for burst strength previously carried out have shown good agreement with experimental data using some empirical formulas modifying by yield strength and tensile strength obtained. The modification is, however, not surely available more to further pipes which have peculiar geometry such as partial wear or composite material properties.
Analysis by Finite element method (FEM) can be considered as one of the appropriate methods evaluating the burst strength, while not so many comparisons of analytical value with experimental have existed. In the present study, the burst strength is calculated by elasticplastic FEM based on bifurcation theory, and further discussions with the analytical results are done. The effect of axial tensile loading which is generated due to the internal pressure acting onto the end caps during the conventional burst test and the FEM considered the configuration of the test specimen.
The burst strength calculated by the FEM analysis is obviously equivalent to the experimental data, which suggests that the elasticplastic FEM used is quite applicable to the simulation of burst strength. The strength can be also well estimated by the conventional yield onset pressure with consideration of Mises' yield ellipse. The burst strength measured is definitely subjected to the tensile axial loading, and is larger by about 15% than that of the pipe which is ideally long enough to be free from axial load.抄録全体を表示PDF形式でダウンロード (774K) -
諏訪 稔, 山本 定弘1993 年 31 巻 6 号 p. 343-352
発行日: 1993/11/25
公開日: 2010/08/05
ジャーナル フリーThe resistance to hydrogen induced disbonding of rolled clad steel was investigated by thermal hydrogen charging in autoclave for the development of heavy gauge rolled Cr-Mo clad steel with higher resistance to disbonding.
Rolled clad steels are shown to have better resistance to disbonding than conventional overlay welded clad steels both in single and multi hydrogen charging. Formation of martensite caused by dilution with base steel, and precipitation of carbide on grain boundary of cladding weld metal caused by carbon migration from base metal are the main causes for the decrease of resistance to disbonding in overlay welded clad steel, which would be suppressed in rolled clad steels utilizing solid phase bonding.
Further improvement of resistance to disbonding in rolled clad steels can be achieved by decreasing the microvoids at the interface and the addition of V to base metal. Good resistance to disbonding can be maintained even after head plate forming and welding.抄録全体を表示PDF形式でダウンロード (4689K) -
町田 進, 出口 明雄, 香川 裕之1993 年 31 巻 6 号 p. 353-360
発行日: 1993/11/25
公開日: 2010/08/05
ジャーナル フリーThe objective of this study is to develop heavy gauge 9% Ni steel plates for large scale LNG strage tanks. At first, influences of chemical compositions upon the strength and toughness were investigated using laboratory heated 9% Ni steels. It was clarified that lowering of C content (0.03%) and addition of Mo (0.1%) improve HAZ toughness without reduction of strength comparing with the conventional 9% Ni steels.
On the basis of the laboratory study, low-C and Mo-added type 9% Ni steel plates with thickness of 20-60mm were manufactured on a commercial scale. A series of material tests were performed and those results showed that the developed steel plates achieved the sufficient strength and toughness even in the case of 60mm in thickness. It was also confirmed that the welded joints of these steel plates had superior toughness to conventional plates especially in HAZ-end region. Gritical CTOD values in the HAZ- end exceeded 0.5mm at-196°C even if pop-in occured. The superiority in HAZ-end toughness was attributable to low C content of the steel.抄録全体を表示PDF形式でダウンロード (724K) -
母材の製造方法と機械的諸特性稲垣 道夫, 鈴木 治雄1993 年 31 巻 6 号 p. 361-367
発行日: 1993/11/25
公開日: 2010/08/05
ジャーナル フリーMechanical properties of base metals and welding materials of the high strength Cr-Mo steels have been reviewed and studied in the activity of the ECM committee in the Japan Welding Engineering Society. The ECM committee collected about 60 papers and reports on the high strength Cr-Mo steels manufactured in Japan, published and non-published in and outside Japan, to establish the data base of the steels required for their JIS material standardization. The base metal mechanical property data of the high strength Cr-Mo steels: Enhanced 2 1/4Cr-1 Mo, Modified 2 1/4 Cr-1 Mo and Modified 3Cr-1 Mo steels, were analyzed in terms of manufacturing procedures and product forms', plate or forging.
The present report summarizes the characteristics of mechanical and physical properties of the steels such as tensile strength at room and elevated temperatures, impact toughness, creep rupture strength, low cycle fatigue life, elastic modulus, thermal expansion constant and so on. The comparison of these characteristics between the steels and with the standard 2 1/4 Cr-1 Mo steel is also shown. Based on the analyses of the tensile strength at room and elevated temperatures and creep rupture strength, the allowable stress and design stress were calculated for JIS 8270 (formerly JIS 88243 and B8250 respectively) and compared with the corresponding values specified in the ASME code cases. It is confirmed that the high strength Cr-Mo steels show almost equivalent values to the ASME allowable and design stresses, significantly higher than those of standard 2 1/4 Cr-1Mo steel as expected. They also exhibit good impact toughness and low cycle fatigue property.抄録全体を表示PDF形式でダウンロード (828K) -
1993 年 31 巻 6 号 p. 368-381
発行日: 1993/11/25
公開日: 2010/08/05
ジャーナル フリーPDF形式でダウンロード (1658K)
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