Abstract: For the fuel tank of the passenger car, an important safety component, a finite element analysis considering fluid-structure interaction is conducted in its early design stage, and it is found that there is strain exceeding phenomenon in the front and rear drops. Structural improvements are made to its risk areas, and strength simulations show that the maximum equivalent plastic strain values decreased by 44.7% and 33.3% respectively compared to before the improvement. The drop test shows that there is no leakage and rupture, which meets the design requirements. The simulation and testing based on finite element analysis provide a scientific basis for the development of fuel tanks, which can effectively improve product development efficiency and reduce test costs.

Key words: Fuel tank; Strength of structure; Finite element analysis; Experimental study

摘要： 针对乘用车燃油箱这一重要的安全部件，在其前期设计阶段进行考虑流固耦合的有限 元分析发现，前部和后部跌落存在应变超标现象。对其风险部位进行结构改进，强度仿真显 示，等效塑性应变最大值相比改进前分别减少 44.7%和 33.3%，跌落试验显示均无泄漏和破裂 发生，满足设计要求。结果表明，基于有限元分析的仿真和试验为燃油箱的开发提供了科学 依据，可有效提升产品开发效率并降低试验成本。

关键词: 燃油箱；结构强度；有限元分析；试验研究