巻号一覧
24 巻 (1986)
- 6 号 p. 290-
- 5 号 p. 228-
- 4 号 p. 164-
- 3 号 p. 106-
- 2 号 p. 55-
- 1 号 p. 3-
前身誌
24 巻, 4 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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橋本 勝邦, 乙黒 靖男, 斎藤 俊明, 矢田 浩, 松村 義一1986 年 24 巻 4 号 p. 164-172
発行日: 1986/07/25
公開日: 2010/08/05
ジャーナル フリーIn an effort to develop an advanced Cr-Mo steel required for increasing operation temperature and pressure in oil refinery and coal liquefaction, the effects of alloying elements on high temperature strength were systematically investigated. Furthermore, the effects of manufacturing process and chemical composition on high temperature strength were also examined with hot rolled Cr-Mo steel strip for the coilayer vessel, one of the multilayer vessels.
The optimum chemical composition for the extra large thickness steel plate was 0.15C-3Cr-1Mo-0.25V-0.04Nb. The continuously hot rolled steel strip with the same composition showed 30kgf/mm2 of 105h creep rupture strength at 482°C even when the strip was subjected to the post weld heat treatment with 20.6×103 of tempering parameter.
The maximum allowable stress at 482°C determined by ASME Section MIII Div. 1 was about 18kgf/mm2 which corresponds to 1.5 times as much as that of 21/4Cr-1 Mo steel.
The strip Showed 26kgf/mm2 of 105h creep rupture strength at 482°C even when carbon content was decreased to 0.08 pct. and heating temperature before rolling was 1150°C.
In spite of extra high strength as mentioned above, the strip indicated excellent toughness, less temper embrittlement, and as good resistance to hydrogen attack as that of 3Cr-1 Mo steel.抄録全体を表示PDF形式でダウンロード (5599K) -
富士 彰夫1986 年 24 巻 4 号 p. 173-180
発行日: 1986/07/25
公開日: 2010/08/05
ジャーナル フリーSQV2A steel plates are used for cylindrical shells, which are in fuel zone and receive highest neutron exposure, and other pieces of nuclear reactor pressure vessel.
In the pressure vessel fabrication, the heavy section plates have been formed and heat treated at the utmost conditions to have high strength and high fracture toughness to prevent brittle fracture.
The metallurgical considerations in the shop and the quality of the heavy section steel plates used for four commercial nuclear pressure vessels are described in this paper.抄録全体を表示PDF形式でダウンロード (920K) -
加賀 精一, 藤井 克弘, 山本 義秋, 佐久間 宏輔, 日〓 正治, 森本 裕介1986 年 24 巻 4 号 p. 181-189
発行日: 1986/07/25
公開日: 2010/08/05
ジャーナル フリーStudies on the stress corrosion cracking of explosive plugged part are conducted. SUS 304 stainless steel is used as testing material.
The distribtion of residual stress in plug and tube plate after plugging is obtained. The effect of residual stress on the stress corrosion cracking is studied. Residual stress in tube plate near the plug is compressive and stress corrosion cracking dose not occur in the tube plate there, and it occurs on the inner surface of plug because of residual tensile stress in axial direction of the plug.
Stress corrosion test in MgCl2 solution under constant load is conducted.
The susceptibility to stress corrosion cracking of the explosive bonded boundary is lower than that of base metal because of greater resistance to plastic deformation.
Stress corrosion test in high temperature and high pressure pure water is also conducted by means of static type of autoclave but stress corrosion cracking does not occur under the testing condition used.抄録全体を表示PDF形式でダウンロード (5625K) -
安藤 柱, 豊田 和司, 別府 義行, 永松 治夫, 古沢 琴風1986 年 24 巻 4 号 p. 191-198
発行日: 1986/07/25
公開日: 2010/08/05
ジャーナル フリーLow cycle fatigue test has been made on the tee welded joints in oil storage tank. Specimens were made of HT80, HT60, SM50 and SM41 steels respectively. Fatigue tests were done mainly by the method of displacement control, but some specimens were tested under the condition of load control.
It is investigated that the effects of strength level and also plate thickness of annular plate on the low clycle fatigue behavior. Crack initiation clycle Nc and Fatigue life Nf showed good correlation with deformation range Δδ70 as shown in the following equation.
Δδ70=CNm
where, C and m are materials constant and it is shown in Table3 collectively as a function of steel and plate thickness.
By using recrystalization method, deformation behavior near low clycle fatigue crack also has been investigated in detail. It is found that the width of recrystalization zone d near crack showed good correlation with fatigue life Nf as shown in the next equation.
Nf⋅d1.43=1.0抄録全体を表示PDF形式でダウンロード (4424K) -
宮崎 則幸, 金子 秀明, 宗像 健1986 年 24 巻 4 号 p. 199-207
発行日: 1986/07/25
公開日: 2010/08/05
ジャーナル フリーThe stress intensity factor is used to predict failure of structures due to the brittle fracture and the fatigue. Although three-dimensional finite element method has been successfully applied to calculate the stress intensity factor of cracks in three-dimensional structures, it requires a considerable amount of computational time, so that its use is sometimes limited by a high cost. The line-spring method was devised by Rice and Levy as an economical way to calculate the approximate stress intensity factor of cracks in three-dimensional structures. Afterward, it has been incorporated into finite element programs and various kinds of three-dimensional problem have been solved by two-dimensional analysis using the line-spring finite element method.
In the present paper, the line-spring model of Rice and Levy is combined with the boundary element method, which is one of powerful numerical techniques as well as the finite element method, to analyze the stress intensity factor of cracks in three-dimensional structures. The line-spring boundary element method is more economical than the line-spring finite element method, since it enables one-dimensional analysis of three-dimensional crack problems. The present method is first applied to the stress intensity factor analysis of an embedded elliptical crack to study the effects of the types of boundary element, i. e. the constant, linear and quadratic elements, and boundary element mesh on the accuracy of the solutions, Furthermore, it is also applied to the stress intensity factor analyses of closely located or partly overlapped twin cracks to clarify the interaction effect of cracks.抄録全体を表示PDF形式でダウンロード (850K) -
破壊力学的研究を中心として浦部 吉雄1986 年 24 巻 4 号 p. 208-216
発行日: 1986/07/25
公開日: 2010/08/05
ジャーナル フリーStructural integrity of pressure vessel is one of the most important problems for the safety of light water reactors.
In this report research programs on PTS issue in US and some European countries are summarized briefly, especially from the point of fracture mechanics study.抄録全体を表示PDF形式でダウンロード (962K)
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