成果報告書詳細
管理番号20140000000146
タイトル*平成25年度中間年報 水素利用技術研究開発事業 燃料電池自動車及び水素供給インフラの国内規制適正化、国際基準調和・国際標準化に関する研究開発 複合圧力容器蓄圧器の基準整備等に関する研究開発
公開日2014/5/2
報告書年度2013 - 2013
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
プロジェクト番号P13002
部署名新エネルギー部
和文要約
英文要約Title: Hydrogen Utilization Technology Development.
Development for Adequate Domestic Regulation, International Harmonization in Regulation and International Standard for Fuel Cell Vehicle and Hydrogen Infrastructure.
Development for Design Standard of Composite Accumulator for Hydrogen Refueling Station (FY2013-FY2014)
FY2013Annual Report
Responsibility: The University of Tokyo
The High Pressure Gas Safety Institute of Japan
Japan Petroleum Energy Center

Objective
This project is organized for investigation of optimum fatigue strength design both of Type 3 and 4 Carbon Fiber Reinforced Plastic (CFRP) accumulator for hydrogen refueling station. Results of the project will be utilized for adequate domestic regulation from the view point of international harmonization.
Results in 2013 FY
(1)Various test mediums were applied to select appropriate test mediums to prevent corrosion. Various fatigue test by aluminum test pieces are also conducted.
(2)Various deep and shallow cycle test plan are planned to evaluate the combination effect of pressure cycle mean pressure and pressure cycle amplitude.
(3)The Type 4 accumulator for various fatigue test to see their failure mode are designed for purchase.
(4)The stress rupture test of Carbon fiber (these data gathering) for CFRP is in progress.
(5)The fatigue test of Carbon Fiber (these data gathering) for CRRP is in progress.
(6)The following research is focused on optimum design on Type 3 accumulator from the viewpoint of A6061 aluminum liner fatigue strength.
1 Design criterion
We conclude that the range of the first principal stress, that is, hoop stress of the liner is decisive from the results of pressurized cycle test using small size Type 3 vessels and simple aluminum liners. The design fatigue curve should be defined with adequate design margin to fatigue curves obtained from test piece fatigue test.
2 Optimum design for cylindrical part
The light weight optimum design can be searched for by the developed algorithm on the basis of simplified model of infinite length pipe, which consists of three layers of aluminum liner, hoop CFRP layer and helical CFRP layer. The optimum thickness combination of these three layers is determined with the constraint on the range of the first principal stress of the liner. A parametric study is carried out by employing steel liner and PITCH carbon fiber with various stress range constraint on liner. We reveal that the change of the Young’s modulus by these materials leads drastic change of accumulator type. For steel liner with PAN carbon fiber, the Type 2 accumulator is lighter than Type 3. For steel with PITCH, much decrease of total weight is expected by Type 3 constitution.
3 Optimum design for dome part  
Aiming at optimum design by means of finite element analyses, we develop pre-processor for finite element modeling, in which complicated CFRP layer stack of high and low angles helical layers is adequately expressed in the manner of layer by layer. The increase of layers thickness along dome surface to boss and end points on the surface are determined by semi-automatic manner.
(7)The Acoustic Emission Testing is considered to be a candidate of in-service safety inspection method for CFRP accumulator. We have conducted literatures research and specified the appropriate literature of AE Testing.
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