重庆大学学报2017，Vol.40Issue(4)：9-17,9.DOI:10.11835/j.issn.1000-582X.2017.04.002
基于缺口应力法的焊接接头多轴疲劳分析
The multi-axle fatigue analysis of welded joints based on notch stress method
摘要
Abstract
As the existing fatigue assessment curves of welded joints are only applicable to uniaxial load,we analyzed the multi-axial fatigue of welded joints on the basis of notch stress method.Firstly,through the combination of the nominal stress data in the multi-axial fatigue test of welded joints and the notch stress concentration factor calculated by finite element method,the notch stresses of 5 kinds of welded joints in different directions were obtained.Secondly,equivalent notch stresses were respectively calculated according to 3 kinds of multi-axial fatigue criteria,i.e.Von Mises,IIW (International Institute of Welding) and EESH (equivalent effective stress hypothesis),and they were unified into the same coordinate system.Finally,the fatigue life curves that were applicable to the assessment of the multi-axial notch fatigue were fitted out with the least square method.Compared with the uniaxial curve recommended by IIW,the multi-axial fatigue curves have lower inclination and higher fatigue class.The fatigue strength value within the mid-circle range from 10a to 106 circles is obviously reduced when multi-axial is loaded,while the influence on the high circle fatigue range from 106 to 107 circles is relatively limited.关键词
焊接接头/多轴疲劳/缺口应力/S-N曲线/疲劳等级Key words
welded joint/multi-axial fatigue/notch stress/S-N curve/fatigue level分类
矿业与冶金引用本文复制引用
刘旭,张开林,刘斌,姚远..基于缺口应力法的焊接接头多轴疲劳分析[J].重庆大学学报,2017,40(4):9-17,9.基金项目
国家自然科学基金资助项目(51205324).Supported by National Natural Science Foundation of China(51205324). （51205324）
