巻号一覧
26 巻 (1988)
- 6 号 p. 347-
- 5 号 p. 289-
- 4 号 p. 165-
- 3 号 p. 111-
- 2 号 p. 61-
- 1 号 p. 3-
前身誌
26 巻, 5 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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安藤 清1988 年 26 巻 5 号 p. 289-299
発行日: 1988/09/25
公開日: 2010/08/05
ジャーナル フリーHigher levels of safety are recently required of such structures as nuclear power plant components, aircrafts, liquified natural gas carrier, etc., with an emphasis on the “leak-before-break” philosophy. The ASME Boiler and Pressure Vessel Code was the first case to incorporate this concept in the form of rule in its Section XI. In terms of rule requirements, however, there still remains much to be addressed and explored.
This paper discusses the evaluation technique for parallel surface crack propagation and coalescence proposed by the DBA-84 committee in HPI.
The validity of this technique was verified by applying it to experimental test data obtained by the AFC Sub-committee in JWES.
For comparison, the ASME Code was applied to the same problem. In addition, the detailed simulation analysis for parallel surface crack propagation was made by modeling the mutual interaction effect of parallel surface cracks at the plate surface as that of parallel through cracks.抄録全体を表示PDF形式でダウンロード (2610K) -
第2報 LBB条件およびき裂開口挙動の検討南 起祐, 酒井 譲, 安藤 柱, 小倉 信和1988 年 26 巻 5 号 p. 300-309
発行日: 1988/09/25
公開日: 2010/08/05
ジャーナル フリーThe LBB behavior of a structural component under high stress, low cycle fatigue conditions are an important problem in a nuclear power plants, LNG tankers or chemical plants. This paper is an experimental study to clarify the crack shape at penetration, crack opening behavior after penetration and the LBB conditions on plate specimens (HT80, STS42) and pipe specimens (STS38). The load pFLBB. which realizes the LBB condition is derived based on net stress criterion.
It is found that pFLBB is dependent only on the initial crack length a0. Further more, it is shown that the crack opening displacement V at the center of a penetrated crack is introduced using the gross stress, δG, and the front surface crack length, as, and back surface crack length, ab.抄録全体を表示PDF形式でダウンロード (2459K) -
朝倉 祝治, 中津川 勲, 上原 陽一1988 年 26 巻 5 号 p. 310-316
発行日: 1988/09/25
公開日: 2010/08/05
ジャーナル フリーThe evaluation of corrosion rate of iron in alkaline solutions with and without chloride ions by means of polarization resistance method was examined. When the iron was not passive, the polarization conductance obtained by imposing square wave current was linearly related to corrosion rate regardless of corrosion forms. The constant correlating between polarization conductance and corrosion rate was discussed. The validity of polarization resistance method with iron in alkaline solutions was proved.抄録全体を表示PDF形式でダウンロード (742K) -
圧力容器鋼の水素脆化特性評価法小林 順一, 武子 康平1988 年 26 巻 5 号 p. 318-323
発行日: 1988/09/25
公開日: 2010/08/05
ジャーナル フリーAs for steels for pressure vessel used in hydrogen environment, hydrogen embrittlement is one of the most important problem for the integrity of the vessel. The threshold stress intensity (KIH) is considered as one of the most reliable parameter to evaluate the susceptibility of steel to hydrogen embrittlement. Then, the test for KIH measurement was carried out using WOL specimens with different specimen thicknesses immersed in H2S saturated 0.5 percent acetic acid solution at 25°C. The materials used were 80kgf/mm2 class strength quenched and tempered steel with the thickness of 127mm.
The results obtained are as follows;
1) KIH value decreased with decreasing specimen thickness and increasing the ratio of the specimen surface area to the volume of test solution (specific volume of solution).
2) Time dependence of hydrogen absorption in aqueous solution of H2S varied with specimen thickness and specific volume of solution. This phenomena was able to be explained analytically by a hydrogen diffusion model which has boundary conditions that the hydrogen concentration at surface of steels depends on the corrosion rate.
3) A single relationship between KIH value and hydrogen concentration calculated by the hydrogen diffusion model was obtained. In this relationship there is neither thickness effect nor specific volume of solution effect. This relationship should be the inherent hydrogen embrittlement characteristics of the steel.抄録全体を表示PDF形式でダウンロード (583K) -
福島 貞夫, 春日井 孝昌, バウカー ジョン1988 年 26 巻 5 号 p. 324-333
発行日: 1988/09/25
公開日: 2010/08/05
ジャーナル フリーThe HAZ toughness of three steels all meeting EH36 grade specifications have been investigated. The simulated and real weld HAZ microstructure, notch toughness and CTOD toughness were studied for weld heat inputs of 3.5MJ/m, 6MJ/m and 10MJ/m.
At 3.5MJ/m, Charpy absorbed energy curves for simulated HAZ specimens of three steels were very similar. With the increase in weld heat input, the energy transition curves for steel E, EH36, shifted to a higher temperature compared to those for steels A and C, both EH36 Mod.. Charpy absorbed energy curves for real weld specimens shifted to a lower temperature compared to those for the simulated ones. This tendency was caused by the difference in microstructural constituent and grain size along the fracture path in both specimens.
The CTOD toughness of real weld HAZ's of steels A and C was similar to that of simulated HAZ's. Through the whole weld heat input, the real weld HAZ of steel E showed good toughness in spite of low CTOD values obtained from the simulated HAZ specimens. This resulted mainly from the difference in grain growth and microstructure at the middle of fatigue crack front of both specimens.抄録全体を表示PDF形式でダウンロード (8847K) -
鵜戸口 英善1988 年 26 巻 5 号 p. 334-342
発行日: 1988/09/25
公開日: 2010/08/05
ジャーナル フリーA brief review and interpretation on the Guideline for Seismic Design of Oil Storage Steel Tanks which is included as a Reference in JIS B 8501-1985 “Welded Steel Tanks for Oil Storage” are described here. The guideline consists mainly of seismic response of oil storage tanks in high and low frequency earthquakes, and evaluations of safety against stress intensities, buckling and elephant foot bulge of shells, and bending of annular plates due to seismic loads. The guideline is related closely to the safety act on oil storage tanks, and some cosiderations on their relations are described.抄録全体を表示PDF形式でダウンロード (1123K)
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