摘要
使用有限元方法,预先分析控制棒驱动机构(CRDM)管座区域过盈配合产生的预应力场,再通过依次模拟多道焊加热和冷却的过程,开展CRDM管座坡口的焊接残余应力数值模拟研究,分析冷装工艺和多道焊焊接残余应力对CRDM管座的共同作用,分析焊道之间的冷却时间的影响,为工程设计和修复提供支持。
Background： Several aspects will influence the weld residual stress analysis of CRDM penetration, such as formation and distribution of heat source, heating and cooling processing, finite elements meshing, phase changing, etc. Purpose： Develop an effective method for weld residual stress analysis, research the influence of interval between heating and cooling step during multipass beads procedure. Methods： Finite elements with a sequentially coupled approach are applied, including a transient thermal analysis simulating the heating and coduring and their interval between multipass welding. Results： An appropriate finite method is developed for weld residual stress simulation. Conclusions： Apropriate interval time must be choosed between multipass weld beads to avoid poor weld residual stress, and contact pressure between RPV shell and CRDM adapter tube also should be check for strcture integrity.
出处
《核技术》
CAS
CSCD
北大核心
2013年第4期283-286,共4页
Nuclear Techniques
关键词
控制棒驱动机构
预应力场
焊接残余应力
Control rod drive mechanism
Pre-stress fields
Weld residual stress
