摘要
应变强化容器所用碟形封头在强化压力下可能产生局部屈曲。在传统的封头有限元分析中,常常截取封头和部分筒体作为研究对象;在非线性加载中,边界条件设置并不准确。使用一种新的加载方法对子模型封头实现精确加载,并设置较为符合生产实际的厚度缺陷,探讨封头在强化压力下的表现,得到结论:在封头最小成形厚度大于设计厚度时,强化过程不会引起封头产生局部屈曲。
Torispherical ends of strain hardening vessels may experience localized buckling under strengthening pressure.In the traditional FEA of heads,the head and partial cylinder are always selected as the research object,while in a nonlinear analysis the setting of boundary is not accurate enough.This paper applies a new technique to set the boundary more accurately.In addition,one type of imperfection,irregular thickness of knuckle,which is more likely to occur in production,is introduced.After checking the performance of head under strengthening pressure,it was concluded that localized buckling will not occur in the knuckle,even in the zone which suffers imperfection,as long as the minimum fabrication thickness is larger than the design thickness.
出处
《化工设备与管道》
CAS
2013年第4期6-11,18,共7页
Process Equipment & Piping
基金
国家科技重大专项资助项目(2009ZX04014-82)
中澳天然气技术伙伴关系基金资助项目(201203)
关键词
子模型
非线性
应变强化
厚度缺陷
局部屈曲
Sub-model
nonlinear
cold stretching
thickness imperfection
localized buckling
