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成果報告書詳細
管理番号20190000000652
タイトル*平成30年度中間年報 超高圧水素インフラ本格普及技術研究開発事業/水素ステーションのコスト低減等に関連する技術開発/複合圧力容器の評価手法確立・技術基準整備に関する技術開発
公開日2019/6/25
報告書年度2018 - 2018
委託先名一般財団法人石油エネルギー技術センター 高圧ガス保安協会 国立大学法人東京大学 株式会社日本製鋼所
プロジェクト番号P18011
部署名次世代電池・水素部
和文要約
英文要約Title: Development of Technologies for Hydrogen Refueling Stations / Development of Technologies for Cost Reduction of Hydrogen Refueling Stations / Establishment of evaluation method for composite pressure vessel ・ Technology development for technical standard improvement (FY2018-FY2020) FY2018 Annual Report

(1) Technology development for establishment of composite pressure vessel design method based on stress analysis and fatigue analysis
1) We have proposed that two types of best fit curve with its experimental formula by achievements.
The characteristics of these best fit curve are shown below.
・ It has a different shape from the best fit curve graph shape that ASME accepts.
・ There is dependence on tensile strength.
Also, in theme of method for mean stress correction, Walker diagram was relatively appropriate. We will continue to study these themes.
2) In order to identify correlations of CFRP fatigue property and matrix fatigue properties, two types of CFRP test pieces made of same carbon fiber and two types of epoxy resin test pieces used for CFRP test pieces were manufactured. Fatigue test of these specimens were started on schedule, and will be continued.
3) A unidirectional CFRP specimen was discretized by a microscale finite element model which resolves carbon fiber and resin separately, and finite element simulation was performed.
4) Hoop wrapped composite cylindrical specimens were manufactured. In the burst test, it was confirmed that the cylindrical specimens ruptured from the CFRP layer as expected. The fabrication of the fatigue testing device was completed. The fatigue test was started on schedule.
5) We determined size for liner of cylindrical specimen and thicknesses of helical and hoop layer of CFRP to carry out filament winding. We find its stress state was close to that of actual Type 3 composite pressure vessel. We demonstrated feasibility of manufacturing cylindrical specimen by filament winding.
6) To develop new fatigue life design curve for the aluminum liner of Type3 composite pressure vessel, mean stress correction methods have been investigated using the pre-existed data.
7) The lower limit of a fracture strength of fatigue test results of CFRP specimens was adequately predicted from a fatigue property of resin by means of interfacial normal stress.
8) We have manufactured a type 3 composite pressure vessel (76 L) that leaks from the body, and acquired fatigue life data from pressure cycle tests.

(2) Technical development for improvement of technical standard of composite pressure vessel
1) We set up the Type 2 pressure vessel Technical Document Study Subcommittee and the Task Force, extracted issues concerning materials and design based on the technical document draft prepared in the previous NEDO business, and started discussions.
2) We summarized the request for revision of KHKS 0225 and started to study the revision policy.
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