文献类型：期刊文献

中文题名：钎焊板翅结构残余应力的分布与优化研究

英文题名：Study on Distribution and Optimization of Residual Stress inside Plate-Fin Structure after Braze Welding

作者：周帼彦[1];涂善东[1];轩福贞[1];王正东[1]

机构：[1]华东理工大学机械与动力工程学院承压系统安全科学教育部重点实验室,上海200237

年份：2010

卷号：31

期号：4

起止页码：101

中文期刊名：核动力工程

外文期刊名：Nuclear Power Engineering

收录：CSTPCD;;EI(收录号：20103913261164);Scopus;北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：国家自然科学基金资助项目(No.50905060);上海市自然科学基金资助项目(No.09ZR1408000)

语种：中文

中文关键词：板翅结构;钎焊;残余应力;急速冷却;加压组装

外文关键词：Plate-fin structure, Brazing, Residual stress, Quick cooling, Pressured assembly

摘要：利用有限元法对不同操作条件下的钎焊板翅结构残余应力进行分析。计算结果表明,成型后的板翅结构单元中存在较大的残余应力,最大残余应力出现在钎角附近。钎焊过程中的固化急速冷却速度对钎焊残余应力有显著影响。急速冷却速度越快,越有利于材料性能的提升,但是钎角附近的残余拉伸应力也越大。另外,采用加压组装工艺可在钎焊后的板翅结构中产生残余压应力,有效提高了钎焊板翅结构的服役安全和寿命。
The residual stress inside the plate-fin structure has been analyzed by the finite element method under different operation conditions. The calculated results show that a large scale of residual stress will occur in the plate-fin structure and the maximum value is found at the braze comer. The rapid cooling process and the pressured assembly technology have a significant effect on the distribution of the residual stress. The brazed material owns a better performance with a quicker cooling rate. However, the quicker cooling rate also leads to a tensile residual stress near the brazed seam, which is deleterious to the whole structure. The pressure assembly technology can change the residual stress from a tensile state to the compressed state which can improve the safety and extend the service life of the plate-fin structure effectively.