Fatigue Analysis of Polyethylene Fuel Tanks Used in Buses

International Journal of Civil and Structural Engineering Pub Date : 2015-09-27 DOI:10.15224/978-1-63248-070-5-48

E. Akay, Gokay Simitcioglu, H. Ustaoğlu, H. Türkmen, Sedat Süsler, S. Ayhun, Serter Atamer, V. Dogan, Y. Erginsoy, Z. Mecitoğlu

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Abstract

In this paper, the fatigue analysis part of a project which aims to develop a computer aided methodology for developing/designing of the polyethylene fuel tanks is presented. The fatigue performance of the polyethylene material based on the stress-life (S-N) approach is obtained by coupon tests. Dynamic “g forces”, which act on the fuel tanks as base excitations, are obtained from the specific bad road runway experiments by the Mercedes-Benz Turk (MBT) R&D Center. In the finite element simulation, dynamic stresses are obtained for different fullness ratios of the tank by using PERMAS V15. Fluid-structure interaction problem is also considered, fluid (fuel) is modeled with acoustic elements, and structure (tank) is modeled with shell elements. Fatigue life prediction of the fuel tank is conducted by using the FEMFAT (Finite Element Fatigue Analysis) program. After evaluating results, some geometry optimization is performed. Finally, all fatigue analysis results are compared with the hydro-pulse test results for validation. Keywords— polyethylene, finite element method, fatigue

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客车用聚乙烯油箱的疲劳分析

本文介绍了一个项目的疲劳分析部分，该项目旨在开发一种计算机辅助开发/设计聚乙烯燃料箱的方法。基于应力-寿命(S-N)法对聚乙烯材料的疲劳性能进行了测试。作为基础激励作用于油箱的动态“g力”是由梅赛德斯-奔驰土耳其(MBT)研发中心在特定的坏路跑道实验中获得的。在有限元模拟中，利用PERMAS V15软件对不同满液比下的储罐进行了动应力计算。还考虑了流固耦合问题，流体(燃料)采用声单元建模，结构(油箱)采用壳单元建模。采用有限元疲劳分析(FEMFAT)程序对油箱进行疲劳寿命预测。在评估结果后，进行了一些几何优化。最后，将所有疲劳分析结果与水脉冲试验结果进行对比验证。关键词:聚乙烯，有限元法，疲劳

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International Journal of Civil and Structural Engineering

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