Ⅳ型气瓶塑料内胆本构关系选取研究
Study on Constitutive Relation Selection of Type Ⅳ Cylinder Plastic Liner
曾宇 1顾春雷 1吴玉伟 2刘雁鹏 2任明法3
作者信息
- 1. 中车青岛四方机车车辆股份有限公司 青岛 266000
- 2. 大连理工大学工程力学系 大连 116024
- 3. 大连理工大学机械工程学院 大连 116024
- 折叠
摘要
本文建立了轴对称的Ⅳ型气瓶的有限元模型,分析了 70 MPa内压下不同内胆本构关系的Ⅳ型气瓶的应力状态与局部密封结构的密封效果,讨论了内胆本构关系对Ⅳ型气瓶结构强度的影响.结果显示,采用3种本构关系时,气瓶封头顶端瓶口位置是应力集中的薄弱点,气瓶环向方向受力均匀,最大Mises应力、最大应变及最大接触压力均出现在密封口的下突起端;采用割线、试验本构关系时,气瓶可达到密封要求;而采用线性本构关系时,气瓶凹槽结构发生破坏,但剩余结构的应力低于材料断裂强度,仍能保证强度需求.
Abstract
This article established a finite element model of an axisymmetric Type Ⅳ gas cylinder,analyzed the stress state and sealing effect of the local sealing structure of Type Ⅳ gas cylinders with different liner constitutive relationships under an internal pressure of 70 MPa,and discussed the influence of liner constitutive relationships on the structural strength of Type Ⅳ gas cylinders.The results showed that when three constitutive relationships were used,the top of the cylinder head was the weak point of stress concentration,and the cylinder was uniformly stressed in the circumferential direction.The maximum Mises stress,maximum strain,and maximum contact pressure all appeared at the lower protruding end of the sealing port.Among them,when using secant and test constitutive relationships,the cylinder could meet the sealing requirements,while when using linear constitutive relationships,the cylinder groove structure was damaged.However,the stress of the remaining structure was lower than the material fracture strength,which could still ensure the strength requirement.
关键词
Ⅳ型气瓶/塑料内胆/本构关系/局部密封结构Key words
Type Ⅳ cylinder/Plastic liner/Constitutive relation/Local sealing structure引用本文复制引用
基金项目
国家自然科学基金(12272078)
科技领军人才团队专题(DUT22LAB503)
大连市科技创新基金项目(2020JJ25CY011)
出版年
2024
NETL
NSTL
万方数据