巻号一覧
27 巻 (1989)
- 6 号 p. 318-
- 5 号 p. 240-
- 4 号 p. 182-
- 3 号 p. 122-
- 2 号 p. 74-
- 1 号 p. 3-
前身誌
27 巻, 2 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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大江 力, 広江 哲幸, 須藤 勝蔵, 尾崎 忠男1989 年 27 巻 2 号 p. 74-82
発行日: 1989/03/25
公開日: 2010/08/05
ジャーナル フリーRecently, a new type of multilayered vessel has been developed, whose layers are wound spirally along the whole length of cylinder continuously and automatically with high manufacturing efficiency.
The present paper introduces the burst test results for three types of the model vessels, one- directionally wound type, alternately cross- wound type and nozzle- mounted type, describing the following conclusions.
(1) Spirally wound layered vessels constructed with the appropriate spiral winding angles have the same amount of burst strength as solid-wall vessels.
(2) The evaluation curves of the burst pressure for spirally wound vessels with parameter of spiral winding angle are proposed and verified by the experiment.
(3) The nozzle- mounted type vessel which was subjected to the repeated design pressure up to 50 cycles has the burst strength in accordance with Faupel's equation for solid-wall vessel.抄録全体を表示PDF形式でダウンロード (7814K) -
山内 芳彦1989 年 27 巻 2 号 p. 83-89
発行日: 1989/03/25
公開日: 2010/08/05
ジャーナル フリーOne of the failures of cylindrical tank due to seismic forces is an outward bulge of the lower portion of the shell plate termed an “Elephant's Foot Bulge”. From the view point of the plastic collapse, many studies on this phenomenon are recently reported. Kobayashi and others recommended the initiation condition of the elephant's foot bulge as the fully plastic state of the bottom shell plate from vibration tests of a large scaled model tank. But the mechanism and the dynamic characteristics of this failure are not yet clear.
By the finite element code “CNCL-ND” developed by the author especially for nonlinear dynamic analysis of tanks, calculations are carried out for a 9500kl oil storage tank under various conditions, and numerical results show dynamic effects on the nonlinear behavior of tank shell.抄録全体を表示PDF形式でダウンロード (701K) -
中村 宇八郎, 福沢 光男1989 年 27 巻 2 号 p. 90-97
発行日: 1989/03/25
公開日: 2010/08/05
ジャーナル フリーTogether with the development of technology for large capacity computers and high-speed data processing, the utilizing techniques have been enlarged and rapid developments have been made in auto- mization in the design field (CAD) and automatic production by robots in the manufacturing field (CAM). The practising of these CAD/CAM systems have been effectively carried out for comparatively mass produced commodities.
This paper is described the welding CAD/CAM systems for large- size steel structures. The outline of the welding CAD/CAM systems is as in the following.
(1) CAD System
It is the welding CAD system based on the steel structures CAD system “CASSY” (Computer Aided Steel Structures System) developed in the I H I.
By inputting the basic design drawings information, this system prepares the welding point data, sensing point data and the welding condition data.
(2) CAM System
By inputting the CAD information, this CAM system carries out welding by NC robots equipped with highly accurate touch sensing system and arc sensing system functions while making positional correction of the welding line.抄録全体を表示PDF形式でダウンロード (2101K) -
成田 圀郎1989 年 27 巻 2 号 p. 98
発行日: 1989/03/25
公開日: 2010/08/05
ジャーナル フリーPDF形式でダウンロード (152K) -
乙黒 靖男, 伊藤 勲, 斉藤 勝男, 斉藤 俊明, 関口 進1989 年 27 巻 2 号 p. 99-106
発行日: 1989/03/25
公開日: 2010/08/05
ジャーナル フリーThe vessels operated under high temperature and pressure hydrogen are composed of welded structures. It is generally said that the weld has higher susceptibility to hydrogen attack than the base metal.
One of factors which influence hydrogen attack in the welds, seems to be presence of prior austenite grain boundaries.
In this paper, the effects of microstructural change at the prior austenite grain boundaries were investigated with 9% Ni steel in which no carbide changes occur during tempering.
Hydrogen attack was severer in the specimen with higher tensile strength. However, electron microscopic examination indicated that the degree of the hydrogen attack varied with microstructural change in specimens with the same strength level.
The favorable microstructure is that with secondary austenite precipitated on the prior austenite grain boundaries during tempering.
It may be concluded that the prior austenite grain boundaries have high susceptibility to hydrogen attack and the resistance to it is improved by discontinuities in the prior austenite grain boundaries.抄録全体を表示PDF形式でダウンロード (5933K) -
斉藤 玄人, 大石 邦雄, 関根 和喜1989 年 27 巻 2 号 p. 107-114
発行日: 1989/03/25
公開日: 2010/08/05
ジャーナル フリーThe Computer simulation is a useful method for analysing statistical distribution of defect size in structural components.
The directed percolation model, which is a simple one for the stochastic random phenomena, is considered to describe a stochastic growth and propagation of flaw in structural materials.
In the present paper, this model has been applied to simulate the size disatribution of surface-breaking defects such as pits due to corrosion and cracks in welds.
The results obtained by the Monte Carlo simulation are as follows,
(1) The simulated distribution function G(d), which is cumulative number that the depths of the defect will be larger than d, have a form of G(d)=k/dn in the range of large size of defects, where K and n are positive parameters.
(2) For the middle and small size of defects, the simulated G(d) follows the lognormal distribution.
(3) The characteristics of the simulated defect-depth distribution G(d) are in agreement with those of the experimental one concerning the pits due to corrosion in the bottom plates of oil storage tanks.抄録全体を表示PDF形式でダウンロード (872K)
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