基于正交试验的Ⅲ型储氢气瓶内衬结构多因素疲劳性能优化

Multi-factor fatigue performance optimization of typeⅢhydrogen cylinder lining structure based on orthogonal test

目的探究铝合金内衬结构参数对Ⅲ型储氢气瓶的整体疲劳性能影响,得到能提高气瓶使用长时性的内衬优化设计方案。方法基于正交试验结合数值模拟,采用Brown-Miller算法计算复合材料气瓶疲劳寿命。通过相关性分析,综合评估筒身壁厚、长径比和封头椭球比对其疲劳性能的影响,明确筒身壁厚为主要影响因素。基于Goodman平均应力修正方程,分析内衬应力幅随壁厚增加时的变化。并通过常温压力循环试验对优化设计方案进行验证。结果气瓶实际疲劳寿命与模拟结果高度一致,最终循环次数与模拟结果相差5.7%。气瓶疲劳失效位置出现在内衬筒身段,铝合金内衬疲劳失效先于纤维缠绕层。结论优化后的复合材料气瓶较标准要求的疲劳寿命提升44.7%,通过正交试验法对Ⅲ型储氢气瓶内衬结构参数的优化是可行的。

Objective This study aims to investigate the influences of aluminum alloy lining structure parameters on the overall fatigue performance of typeⅢhydrogen cylinder,and obtain the optimal design scheme of lining which can improve the long-term performance of gas cylinder.Methods Based on orthogonal test and numerical simulation,the fatigue life of composite material gas cylinder is calculated by Brown-Miller algorithm.Through correlation analysis,the influences of cylinder wall thickness,length-diameter ratio and head ellipsoid ratio on fatigue performance are comprehensively evaluated,and the main factor is confirmed to be cylinder wall thickness.Based on Goodman average stress correction equation,the variation of lining stress amplitude with the increase of wall thickness is analyzed.The optimal design is verified by the normal temperature pressure cycle test.Results The actual fatigue life of cylinders is in good agreement with the simulation results,and the final cycle times are 5.7%,which is different from the simulation results.The fatigue failure position of gas cylinder appears in the lining cylinder body,and the fatigue failure of aluminum alloy lining is earlier than that of fiber winding layer.Conclusions The fatigue life of the optimized composite material gas cylinder is 44.7%longer than that of the standard.It is feasible to optimize the lining structure parameters of type III hydrogen cylinder by orthogonal test.