Fatigue assessment of weld structure based on the hot spot stress method
WANG Wenjing
BAI Jinyi
LIU Wei
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.
Keywords：hot spot stressweld jointfatigue lifeantenna beam
Publication Date：2017-11-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 82-87 )