无模胀形蛋形耐压壳的应力重分布分析  

Stress redistribution analysis of egg-shaped pressure shell fabricated by dieless free hydroforming

作　　者：朱永梅[1] 孙天意 孙志莹 陈建志 张建[1] ZHU Yongmei;SUN Tianyi;SUN Zhiying;CHEN Jianzhi;ZHANG Jian(School of Mechanical Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China)

机构地区：[1]江苏科技大学机械工程学院,镇江212100

出　　处：《江苏科技大学学报(自然科学版)》2024年第6期1-6,共6页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金面上项目(52271277);江苏省自然科学基金面上项目(BK20211343)。

摘　　要：无模胀形蛋形耐压壳焊接处的应力重分布特性会影响耐压壳疲劳寿命的准确评估.根据蛋形轮廓曲线函数,设计了一个用于4000 m水下工作的蛋形耐压壳,通过建立数值模型,研究不同外压载荷下未胀形蛋壳焊接处的应力分布.结合无模胀形原理,研究内胀变形对分段式蛋壳趋向蛋形的影响,并比较无模胀形前后蛋壳焊接处的应力分布.结果表明:蛋壳焊接处的应力随外压载荷增加而增加,母线曲率对蛋形耐压壳焊接处的弯曲应力影响很大;无模胀形对分段式蛋壳的蛋形改善效果良好,内胀载荷为60 MPa左右效果最好.通过无模胀形有效降低蛋形耐压壳各焊接处的弯曲应力,且缩小了各焊缝弯曲应力差.The stress redistribution characteristics of the welded egg-shaped pressure shell fabricated by dieless free hydroforming will affect the accurate evaluation of its fatigue life.In this paper,according to the egg-shaped contour curve function,an egg-shaped pressure shell for working at 4000 meters underwater was designed.A numerical model was established to study the stress distribution of the weld of the unexpanded eggshell under different external pressure loads.Combined with dieless free hydroforming theory,the effect of internal expansion deformation on the tendency of segmented eggshell to egg-shape was studied,and the stress distribution of eggshell weld before and after dieless free hydroforming was compared.The results show that the stress at the eggshell weld increases with the increase of external load,the busbar curvature has a great influence on the bending stress at the eggshell weld.Dieless free hydroforming has a good effect on the improvement of the egg shape of the segmented eggshell,60 MPa is the best internal expansion load.It can not only reduce the bending stress at the eggshell weld,but also reduce the bending stress difference of each weld.

关 键 词：蛋形耐压壳 分段式 无模胀形 应力重分布 

分 类 号：U661.4[交通运输工程—船舶及航道工程] TG404[交通运输工程—船舶与海洋工程]