中国机械工程2024，Vol.35Issue(6)：1097-1102,6.DOI:10.3969/j.issn.1004-132X.2024.06.015
残余应力对GH3230层板焊缝热疲劳寿命影响规律研究
Study on Influence Rules of Residual Stress on Thermal Fatigue Life of GH3230 Laminate Welds
摘要
Abstract
In order to investigate the influences of residual stress on the service life of weld seams of laminate cooling structures,first of all,finite element simulation and experimental verification were carried out on the laser welding processes of GH3230 laminate under conventional conditions.Then corresponding regulated approaches including pre-stretching and thermotensile et al.were simu-lated and analyzed.Afterwards,the evolutions of temperature and equivalent stress during service pe-riods with and without residual stress were studied respectively.The service life was later evaluated u-sing Coffin-Manson model modified by Morrow.The results demonstrate the thermal fatigue life caused by residual stress is significantly decreased.Furthermore,the stress amplitude and the mean stress while servicing,which decreasing 70％and 25％respectively,are effectively improved using regulating approaches mentioned above.Regulating welding residual stress is of vital importance for improving the thermal fatigue life of laminate structures.关键词
层板结构/残余应力/热应力/疲劳寿命Key words
laminated structure/residual stress/thermal stress/fatigue life分类
矿业与冶金引用本文复制引用
董志波,李承昆,王程程,韩放,张植航,滕俊飞,吕彦龙..残余应力对GH3230层板焊缝热疲劳寿命影响规律研究[J].中国机械工程,2024,35(6):1097-1102,6.基金项目
航空发动机及燃气轮机重大专项(J2019-Ⅶ-0012-0152) （J2019-Ⅶ-0012-0152）
