航空材料学报2025，Vol.45Issue(1)：44-52,9.DOI:10.11868/j.issn.1005-5053.2023.000019
7075/6061铝合金TIG焊搭接接头疲劳性能评估
Fatigue property evaluation of 7075/6061 aluminum alloy TIG welded overlap joints
摘要
Abstract
Constant-amplitude fatigue tests were conducted on overlap specimens of 7075/6061 aluminum alloy TIG fillet weldes.Subsequently,detailed finite element models were developed based on both the hot spot stress method and the critical distance method.The range of maximum principal stress variation was from these models as a fatigue evaluation index for further analysis.By combining the results of finite element stress-strain analysis with the S-N curve recommended by the International Institute of Welding(IIW),the fatigue lives of the weld joints under various loadings were estimated.Testing revealed that specimens primarily fractured at the weld toes on the 7075 side.The maximum stress-strain concentration points in the finite element model were located at the weld toe on the 7075 side,aligning closely with the actual fracture locations.By comparing the predicted fatigue lives with the actual test results,it was determined that the hot spot stress method can predict the fatigue life of TIG welds more accurately.After correcting for plate thickness,the prediction errors were within a factor of two in the low-cycle fatigue range.Both the point method and the line method within the critical distance method can predict hot spot stress,but the point method yields more precise results than the line method.关键词
TIG焊/热点应力法/临界距离法/疲劳寿命/有限元分析Key words
TIG welding/hot spot stress method/critical distance method/fatigue life/finite element analysis分类
航空航天引用本文复制引用
廖祥雲,王瑞杰,刘国寿,赵平林,常亚光,王钟德..7075/6061铝合金TIG焊搭接接头疲劳性能评估[J].航空材料学报,2025,45(1):44-52,9.基金项目
国家自然科学基金(51065012) （51065012）
