壳体单元与实体单元在大型压力容器吊装分析中的对比分析  

Comparative Analysis of Shell Element and Solid Element in Hoisting Analysis of Large Pressure Vessel

作　　者：赵亚如 王亚萍 王瑞卿 张珺珺 ZHAO Yaru;WANG Yaping;WANG Ruiqing;ZHANG Junjun(Himile Mechanical Manufacturing(Shandong)Co.,Ltd.,Weifang 261500)

机构地区：[1]山东豪迈机械制造有限公司,潍坊261500

出　　处：《现代制造技术与装备》2024年第8期88-92,102,共6页Modern Manufacturing Technology and Equipment

摘　　要：研究压力容器各结构在吊装过程是否会发生塑性垮塌至关重要,但压力容器结构复杂,建立的有限元模型网格数量较多,降低了计算效率。基于此,提出用壳体单元模型替代实体单元模型的方法,并对结果的可靠性进行验证。研究结果表明,壳体单元最大Mises当量应力位置、变形趋势与实体单元相同,但由于实体单元存在峰值应力,实体单元的Mises当量应力大于壳体单元;壳体单元的薄膜应力与薄膜加弯曲应力均大于实体单元,实体单元的Mises当量应力大于壳体单元,这是因为壳体单元仅计算了一次应力与二次应力,无峰值应力,但不影响塑性垮塌评定。因此,对于非疲劳工况的压力容器,可采用壳体单元代替实体单元进行分析,以在减少计算量的情况下得到精确的数值解。It is very important to study whether the structure of pressure vessel will collapse in the hoisting process.However,the structure of pressure vessel is complicated,and the number of finite element model grids is large,which reduces the calculation efficiency.Based on this,a method of replacing solid element model with shell element model is proposed,and the reliability of the result is verified.The results showed that the maximum Mises equivalent stress position and deformation trend of the shell element were the same as those of the solid element,but the Mises equivalent stress of the solid element was greater than that of the shell element due to the existence of peak stress.Mises equivalent stress of the shell element was higher than that of the solid element,because the Mises equivalent stress of the solid element was higher than that of the shell element,only the primary stress and secondary stress were calculated,and there was no peak stress,but it did not affect the assessment of plastic collapse.Therefore,for the pressure vessel under non-fatigue conditions,the shell element can be used instead of the solid element for analysis,in order to obtain a accurate numerical solution with less calculation.

关 键 词：壳体单元 实体单元 有限元模型 压力容器 吊装 塑性垮塌 

分 类 号：TH49[机械工程—机械制造及自动化]