成果報告書詳細
管理番号20160000000236
タイトル*平成27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2016/9/2
報告書年度2015 - 2015
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-FY2017)
FY2015 Annual Report

Responsibility: The University of Tokyo
The High Pressure Gas Safety Institute of Japan (KHK)
Japan Petroleum Energy Center
 
Objective:
This project is organized for investigation of optimum fatigue strength design three of Type3, 4 and 2 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 2015 FY:
(1) Various deep and shallow cycle tests are conducted to evaluate the combination effect of mean pressure and pressure amplitude with 30L Type3 cylinders.
(2) Hydraulic pressure cycle tests are conducted and their failure mode are evaluated with 36L Type4 cylinders.
(3) 20L Type2 test cylinders are designed and ordered.
(4) The stress rupture test and the fatigue test of CF is in progress.
(5) The research is focused on Type 3 accumulator from the viewpoint of A6061 aluminum liner fatigue strength, and Type 4 accumulator from the viewpoint of fiber strength.
1. Life time strength evaluation of the Type3 accumulator
By FEM analyses, we conclude the hoop stress in the liner cylinder part and the axial stress in the liner dome part of the small size Type 3 pressure vessel are under criterion for fatigue failure while the pressure is under 65MPa. The mean value and the maximum value of the stress under pressure are minus, so during pressurized, the stress varies in linear manner.
2. Life time strength evaluation of the Type4 accumulator
By FEM analyses, we conclude the hoop stress of the FRP hoop layer is the highest value for small size Type 4 pressure vessel, which is good agreement with burst test. Also, maximum principal strain is the highest value at the dome part of CFRP layer, which will cause cyclic damage in the resin area of the CFRP layer and end up with fiber fracture, which can explain the results of the cycle test.
3. Optimum design of Type 2 accumulator
Design method to determine thickness of both metallic liner and CFRP layer is developed based on finite element method.
4. Stress rising after autofrettage caused by the gap during curing process
During curing process, the gap between aluminum liner and CFRP layers may occur, and it causes stress rising of the aluminum liner. FEM analyses were conducted with different size of pre-gap in small size Type3 pressure vessel model. We conclude that the stress rising is small enough when the gap is under 2.0 mm.
(6) The documents and the patents of the inspection methods for CFRP accumulators are investigated and specialists' opinion are gathered.
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