燃油箱耐压性台架试验疲劳开裂仿真分析及优化

Simulation Analysis and Optimization of Fatigue Cracking in Bench Test of Fuel Tank Pressure Resistance

摘要: 汽车的燃油箱在汽车使用过程中，不同使用场景或者随着外界温度变化，燃油箱内部会出产生一定范围的正负压强变化，该变化很大程度上会影响燃油箱的使用寿命。为研究如何缩短产品开发周期，本文对某车型的铁质燃油箱在正负压强耐久台架试验中出现的疲劳开裂问题进行有限元建模和仿真分析。通过将有限元分析的结果与试验开裂数据进行对比验证，得出一种基于疲劳耐久台架试验载荷谱的燃油箱耐压性疲劳寿命的仿真分析方法。此方法可以预测设计的燃油箱可能会出现开裂的位置，从而在样件制造前先优化燃油箱的性能，避免后期多次进行样件的试验，一定程度上缩短了开发周期。

Abstract: During the use of the fuel tank of an automobile, there will be a certain range of positive and negative pressure changes in the fuel tank under different use scenarios or with the change of external temperature, which will greatly affect the service life of the fuel tank. In order to study how to shorten the product development cycle, this paper carried out finite element modeling and simulation analysis on the fatigue cracking problem of a certain model of iron fuel tank in the positive and negative pressure durability bench test. By comparing the results of the finite element analysis with the test cracking data, a simulation analysis method of the pressure fatigue life of the fuel tank based on the fatigue endurance bench test load spectrum is obtained. This method can predict where the designed fuel tank may crack, so as to optimize the performance of the fuel tank before the prototype is manufactured, avoid multiple sample tests in the later period, and shorten the development cycle to a certain extent.