压力容器2025，Vol.42Issue(3)：44-53,10.DOI:10.3969/j.issn.1001-4837.2025.03.006
大椭球比扁平复合材料气瓶的疲劳寿命特性研究
Research on fatigue life characteristics of flat composite cylinders with high ellipticity ratio
李玉峰 1马天驹1
作者信息
- 1. 兰州空间技术物理研究所,兰州 730000
- 折叠
摘要
Abstract
To address the fatigue failure issue of flat composite cylinders with high ellipticity ratio,this study analyzed the main factors influencing cylinder fatigue failure using a flat composite cylinder with TA1 titanium alloy as ultra-thin wall liner(0.8 mm),carbon fiber/epoxy as composite layer,and ellipticity ratio of 2.3∶1.Combining a life prediction model,the fatigue life,failure locations,and their evolution patterns were determined,and experimental validation was conducted.Results show that the fatigue life prediction accuracy reached 93%compared to experimental data.The combined modeling approach using SOLID185 solid elements and SHELL181 shell elements effectively simulated fatigue life of multi-layer structures.During pressurization/depressurization cycles,the liner's elastic deformation rebounds upon pressure reduction,while permanent plastic deformation and material fracture strain directly affect fatigue life.Selecting optimal autofrettage pressure expands the elastic working range;when autofrettage pressure increased from 18 MPa to 24 MPa,fatigue life rose from 99 cycles to 304 cycles,a 207%improvement.These findings provide references for developing high-ellipticity-ratio flat composite cylinders.关键词
复合材料气瓶/疲劳寿命/椭球比/扁平异形Key words
composite cylinder/fatigue life/ellipticity ratio/flat-shaped分类
机械制造引用本文复制引用
李玉峰,马天驹..大椭球比扁平复合材料气瓶的疲劳寿命特性研究[J].压力容器,2025,42(3):44-53,10.
