北京交通大学学报2017，Vol.41Issue(6)：82-87,6.DOI:10.11860/j.issn.1673-0291.2017.06.013
基于热点应力法的焊接结构疲劳评估
Fatigue assessment of weld structure based on the hot spot stress method
摘要
Abstract
In view of the practical difficulies facing the traditional nominal stress approach applied in fa-tigue analysis of weld plate structure,the hot spot stress method based on the surface extrapolation is in-troduced comprehensively.It has been developed in marine structural engineering well.The specimens are loaded under different stress levels and the fatigue life with 97.7％ reliability is obtained.The hot spot stress of the specimen weld toe is calculated by the spot stress method and the fatigue life is given by FAT 90 modified S-N curve considering the plate thickness effect.The results show good accuracy and better reliability in the assessment of weld structure fatigue life.Taking the railway antenna beam as ex-ample,the hot spot stress method is used to get the maximum stress point,which is consistent with the fatigue crack position in service.The fatigue life prediction of the antenna is 7.1 ×105 and it coincides with the actual operation life basically.The analysis method can be applied on the anti-fatigue design of weld joints of plate structure.关键词
热点应力/焊接接头/疲劳寿命/天线梁Key words
hot spot stress/weld joint/fatigue life/antenna beam分类
矿业与冶金引用本文复制引用
王文静,白锦仪,刘伟..基于热点应力法的焊接结构疲劳评估[J].北京交通大学学报,2017,41(6):82-87,6.基金项目
国家科技支撑项目(2015BAG12B01-01) National Key Technology Research and Development Program(2015BAG12B01-01) （2015BAG12B01-01）
