Abstract: In order to solve the problem of fuel loss caused by the cracking of the partition board of the fuel tank of a certain vehicle, the paper analyzes the stress of the fuel tank under different liquid filling ratios and different working conditions by using ANSYS software, so as to find out the failure reasons of the partition board of the fuel tank and optimize and improve it. In order to reveal the damage mechanism and provide the basis and corresponding theoretical basis for the optimization of the fuel tank structure, the fluid-structure coupling mechanical analysis of the fuel tank structure is carried out under different liquid-filling ratios. According to the results of fluid-structure coupling mechanics analysis, the stress concentration exists in the pressing angle of the partition plate of the fuel tank in the calculation result of large liquid-filling ratio. The baffle structure of aluminum alloy fuel tank is improved by using this analysis method, and the baffle strength and tank stability are improved.

Key words: fuel tank; ANSYS; fluid-structure coupling; septum

摘要： 为解决某车型燃油箱因分腔隔板开裂出现的燃油损失问题，文章利用 ANSYS 软件分 析油箱在不同充液比、不同工况下的受力情况，以便找出油箱分腔隔板失效原因并进行优化 改进。为揭示其损伤机理，为油箱结构优化提供依据和相应理论基础，文章在不同充液比下 针对燃油箱结构进行了流固耦合力学分析。通过流固耦合力学分析结果可知，在较大充液比 的计算结果中，燃油箱分腔隔板的冲压折角处也存在应力集中。利用此分析方法对铝合金燃 油箱隔板结构进行改进，提高了隔板强度与油箱稳定性。

关键词: 燃油箱；ANSYS；流固耦合；隔板