巻号一覧
61 巻 (2023)
- 6 号 p. 258-
- 5 号 p. 219-
- 4 号 p. 160-
- 3 号 p. 116-
- 2 号 p. 64-
- 1 号 p. 4-
前身誌
61 巻, 2 号
選択された号の論文の4件中1～4を表示しています
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論文
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久保 智也, 中島 清孝, 緒方 洋典, 山本 元道, 谷野 忠和, 石川 忠, 矢島 浩2023 年 61 巻 2 号 p. 64-75
発行日: 2023年
公開日: 2023/04/30
ジャーナル フリーIn large welded steel structures, there are a lot of free edges cut by plasma arc cut without finishing treatment. In the surface layer of steel plate with plasma arc cut surface, the material is hardened. Therefore, we have to take care of the reduction of fatigue strength due to the local stress concentration and residual stress in the surface layer.
In this study, from a view of the present, the fatigue strength in air and in artificial seawater of five types of 490 MPa class high tensile steel plates with plasma arc cut surface were organized and evaluated comparatively. As a result, the following conclusions were obtained :
1) The surface layers of the steel plates cut by plasma arc cutting were quenched and hardened (about 500～400 HV 3N).
2) For the fatigue strength in air at 1×106 cycles, all types of tested steel plates with plasma arc cut surface or gas cut surface had the fatigue strength over about 90% of the steel plates with machined cut surface and it shows that plasma arc cutting and also gas cutting have almost no problem on the fatigue strength in air of these steel plates.
3) For some types of steel plates cut by plasma arc cutting, the fatigue strength in artificial seawater decreased obviously.
4) Under the conditions in air, the negative effect of plasma arc cutting on the fatigue strength of 490 MPa class high tensile steel plates does not need to be particularly taken into account, while under the corrosion conditions in seawater the sufficient consideration and measures for the fatigue strength of these steel plates are needed.抄録全体を表示PDF形式でダウンロード (2520K)
資料
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高橋 邦夫, 和田 直之, 福田 隆, 田中 郁雄, 大森 章夫, 仁村 慎太朗, 恩澤 忠男2023 年 61 巻 2 号 p. 76-83
発行日: 2023年
公開日: 2023/04/30
ジャーナル フリーPDF形式でダウンロード (1195K)
解説
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吉田 聖一2023 年 61 巻 2 号 p. 84-91
発行日: 2023年
公開日: 2023/04/30
ジャーナル フリーOn August 5, 2022, a large crude oil tank exploded due to a lightning strike to cause massive fire at a tank terminal storing crude oil and petroleum products in Matanzas, Cuba. A boilover occurred in the early hours of the following day, killing 16 firefighters and injuring 146 others. The fire spread to three adjacent large tanks and was extinguished on August 12. This paper provides an overview of the incident based on articles on Cuban internet sites elTOQUE and Cubadebate.抄録全体を表示PDF形式でダウンロード (1238K) -
藤崎 翔, 岡崎 貴浩2023 年 61 巻 2 号 p. 92-96
発行日: 2023年
公開日: 2023/04/30
ジャーナル フリーJGC Corporation launches a service called “HiGHGuardTM” that uses tech-nology to accurately capture GHG emissions from plants.
As a countermeasure to the internationally debated issue of greenhouse gas emissions, much attention is being paid to reducing emissions from oil and natural gas facilities, which have a large impact on greenhouse gas emis-sions. CO2 is the most common greenhouse gas emitted from plants, followed by methane. Compared to carbon dioxide, methane has about 28 times the impact on global warming. To reduce these emissions effectively, it is important to accurately capture the amounts of emissions, but methods for accurately capturing emissions are still in the development stage.
JGC have established a method to accurately calculate GHG emissions by combining methane measurement technologies such as drones, satellites, and infrared sensors with emissions calculation methods. This paper presents the details of this method.抄録全体を表示PDF形式でダウンロード (618K)
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