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An Optimum Fatigue Design of Polymer Composite Compressed Natural Gas Tank Using Hybrid Finite Element-Response Surface Methods

机译：用杂交有限元响应表面方法的聚合物复合压缩天然气箱的最佳疲劳设计

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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.
机译：本研究的主要目的是设计一种高疲劳性能箍包裹压缩的天然气（CNG）复合圆筒。为此，将优化算法作为有限元模拟（FES）和响应表面分析（RSA）的组合。在实验测量后，将几何模型制成可变壁厚。接下来，进行瞬态动态分析，进行加油过程，包括20和200巴的最小和最大内部压力。在关键区域中提取应激张量组分的时间历史。此外，RSA用于研究各种聚合物复合壳制造过程参数（厚度和纤维角）对聚合物复合CNG压力罐（型4）疲劳寿命的相互作用。在优化过程中，在CNG罐和光纤角度的三个不同部分中包括复合壳的壁厚的四个参数被认为是输入变量。此外，组分的最大主要应力被认为是目标函数。最终，使用基于应力的故障标准计算聚合物复合罐的疲劳寿命。结果表明，与初始设计相比，所提出的新设计（应用最佳参数）导致通过聚乙烯衬垫的聚合物复合罐的疲劳寿命约为2.4倍。

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