The main purpose of this research is to design a high-fatigue performance hoop wrapped compressed natural gas (CNG) composite cylinder. To this end, an optimization algorithm was presented as a combination of finite element simulation (FES) and response surface analysis (RSA). The geometrical model was prepared as a variable wall-thickness following the experimental measurements. Next, transient dynamic analysis was performed subjected to the refueling process, including the minimum and maximum internal pressures of 20 and 200 bar, respectively. The time histories of stress tensor components were extracted in the critical region. Furthermore, RSA was utilized to investigate the interaction effects of various polymer composite shell manufacturing process parameters (thickness and fiber angle) on the fatigue life of polymer composite CNG pressure tank (type-4). In the optimization procedure, four parameters including wall-thickness of the composite shell in three different sections of the CNG tank and fiber angle were considered as input variables. In addition, the maximum principal stress of the component was considered as the objective function. Eventually, the fatigue life of the polymer composite tank was calculated using stress-based failure criterion. The results indicated that the proposed new design (applying optimal parameters) leads to improve the fatigue life of the polymer composite tank with polyethylene liner about 2.4 times in comparison with the initial design.

Department of Mechanical and Instrumental Engineering Academy of Engineering Peoples' Friendship University of Russia 6 Miklukho Maklaya Street 117198 Moscow Russia

Department of Mechanical Engineering Islamic Azad University Badroud Branch Badroud Isfahan 8764136545 Iran

Department of Mechanical Engineering Shahrood University of Technology Shahrood 3619995161 Iran

Department of Transport Academy of Engineering Peoples' Friendship University of Russia 6 Miklukho Maklaya Street 117198 Moscow Russia

Institute for Nanomaterials Advanced Technologies and Innovation Technical University of Liberec Studentska 2 461 17 Liberec Czech Republic

School of Mechanical Engineering Faculty of Engineering University Technology Malaysia Johor Bahru 81310 Malaysia

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