巻号一覧
47 巻 (2009)
- 6 号 p. 352-
- 5 号 p. 294-
- 4 号 p. 208-
- 3 号 p. 126-
- 2 号 p. 70-
- 1 号 p. 4-
前身誌
47 巻, 3 号
選択された号の論文の7件中1～7を表示しています
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論文
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吉田 聖一原稿種別: 論文
2009 年 47 巻 3 号 p. 126-136
発行日: 2009/05/25
公開日: 2009/07/31
ジャーナル フリーThe 2003 Tokachi-Oki earthquake caused severe damage to oil storage tanks due to liquid sloshing. Seven single-deck floating roofs had experienced structural problems as evidenced by sinking failure in large diameter tanks at the refinery in Tomakomai, Japan. The pontoons of the floating roofs might be buckled due to bending load during the sloshing. The initial geometrical imperfection may diminish the buckling load of the pontoon. This paper presents the lower bound buckling load of the pontoons using the reduced stiffness method proposed by Croll and Yamada. Both circumferential and radial bending loads are applied to the pontoon. The axisymmetric shell finite element method is used in the linear elastic bifurcation buckling analysis.抄録全体を表示PDF形式でダウンロード (967K) -
第2報: 同種&bull異種材料の接合について羽地 龍志, 宮城 清宏, 真壁 朝敏, 末吉 敏恭, 呉屋 守章原稿種別: 論文
2009 年 47 巻 3 号 p. 137-144
発行日: 2009/05/25
公開日: 2009/07/31
ジャーナル フリーA proposed joining method in the previous study was applied to the joining of two metals. In this method, metal powder was used as binder. The metal powder was sandwiched in the space between the two solid bars, then the solid bars were compressed longitudinally by hydraulic material testing machine and simultaneously current was conducted to generate Joule thermal heat. In the joining, a solid aluminum bar was used as a base material, and was joined to another aluminum bar or one of four other solid materials with different melting points by using resistance-welding apparatus. In the experiments, the specimen used as solid bars in this study were aluminum, carbon steel, stainless steel, titanium and copper bars of solid specimen, and the insert powder were aluminum, nickel powder and these mixture. The reliability of jointed specimens was confirmed by the tensile test properties. It is concluded that the present method is useful for the joining of different metals, and it is of value to continue the investigation for joining by generated Joule heat.抄録全体を表示PDF形式でダウンロード (954K) -
中田 幹俊, 中田 吉彦原稿種別: 論文
2009 年 47 巻 3 号 p. 145-153
発行日: 2009/05/25
公開日: 2009/07/31
ジャーナル フリーTo prepare for prohibition of asbestos products, a verification test was made to select asbestos free spiral wound gasket (SWG) for high-temperature and oxidative condition. Since cracked gas from naphtha cracker of ethylene production plant is over 600°C, asbestos filled SWG was formerly installed in the flanges for this facility. To select substituted gasket free from asbestos, the following gaskets were installed in flanges of actual naphtha cracker: (1) vermiculite filled SWG, (2) mica-graphite filled SWG which was recommended by a gasket manufacturer, (3) asbestos-graphite filled SWG for comparison. After three times of start-stop cycle of the plant operation in near one year, vermiculite filled SWG did not change in its appearance and showed better seal ability than other two gaskets. Mica-graphite SWG could not resist naphtha cracker environment because exfoliated graphite filler was disappeared with oxidative degradation within several months. Vermiculite filled SWG showed higher reliability than mica-graphite filled SWG in the verification test, hence this SWG is expected to have a 2-year durability that is required for the ethylene production plant.抄録全体を表示PDF形式でダウンロード (932K) -
早川 正夫, 木村 恵, 小林 一夫原稿種別: 論文
2009 年 47 巻 3 号 p. 154-160
発行日: 2009/05/25
公開日: 2009/07/31
ジャーナル フリーMicrostructural analyses by field emission-type scanning backscattered electron microscopy on chemical mechanically polished surfaces were performed for two types of ferritic heat-resisting steel that contained 12mass% chromium and 2mass% tungsten to characterize subgrain structures, which have the same tensile strengths but different creep-fatigue properties. The size distributions of the subgrains were quantitatively evaluated before and after creep-fatigue tests, respectively, to relate the creep-fatigue properties.
The steel that had a shorter creep-fatigue life showed denser precipitates on prior austenite grain boundaries and subgrains became coarse in local neighboring the grain boundaries. On the other hand, the steel with a longer creep-fatigue life, which showed less dense grain boundary precipitates and coarse subgrains exited in non-local. The analyses suggested that uniformity between microstructures on prior austenite grain boundaries and interior grains should be attained to improve the creep-fatigue properties.抄録全体を表示PDF形式でダウンロード (2169K) -
木村 恵, 早川 正夫, 小林 一夫, 山口 弘二原稿種別: 論文
2009 年 47 巻 3 号 p. 161-170
発行日: 2009/05/25
公開日: 2009/07/31
ジャーナル フリーAxial strain-controlled fatigue tests of a 9Cr-2W and a 12Cr-2W ferritic heat-resisting steels were performed to obtain fatigue life curves (S-N curve) over a wide from102 to 106 cycles at room temperature (RT) , 400, 600, 650 and 700°C, respectively.
As the results, Manson-Coffin relationships between plastic strain range and fatigue life for the both the steels show linear at room temperature and 400°C.
However, the relationships have inflection around 104 cycles beyond 600°C. There are differences in hystresis loops between in the low-and high cycle regions at these elevated temperatures. Moreover, it is cleared that subgrains became coarse uniformely in the low-cycle regions, while subgrains did coarse locally near grain boundaries, in the high-cycle regions.
Therefore it is suggested that differences in the mechanical factors and change in subgrain structure cause the inflection of the relations at the elevated temperatures.
Then, a modified universal slope method is proposed for S-N curves that considered to inflection in Manson-coffin relation.抄録全体を表示PDF形式でダウンロード (1628K) -
山田 敏弘, 竹花 立美, 福富 洋志原稿種別: 論文
2009 年 47 巻 3 号 p. 171-177
発行日: 2009/05/25
公開日: 2009/07/31
ジャーナル フリーIn order to evaluate the fatigue characteristics of unidirectional CFRP for the design of FRP composite vessels, a new type fatigue specimen is developed. The tab of the specimen made of taper-shaped aluminum is used to avoid stress concentration. Fatigue characteristics of CFRP (T700SC⁄Epoxy) is investigated by this type specimen. It is found that the fatigue behavior should be understood on the two kinds of fatigue characteristics. One originates from the peculiar fatigue of carbon fiber and the other from the fatigue of the matrix materials and interface. S-N curve up to about 107 cycles is evaluated, which can be used to designs of FRP composite vessels for a long term service such as the service in hydrogen stations.抄録全体を表示PDF形式でダウンロード (473K)
解説
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第5報 海外タンクの保全規則•規格の調査-1米国SPCC (漏洩防止管理•対策) 規則の調査田原 隆康, 茨田 高志, 丸山 喜由原稿種別: 解説
2009 年 47 巻 3 号 p. 178-192
発行日: 2009/05/25
公開日: 2009/07/31
ジャーナル フリーIn order to develop Risk Based Maintenance Procedure and Fitness-for-Service Assessment for oil storage tanks, Codes and Standards which constructed total system ensuring maintenance control of tanks in overseas such as API Standards has been investigated and studied as useful references of the most preferable maintanance control standards suitable for circumstamces of Japan.抄録全体を表示PDF形式でダウンロード (1604K)
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