摘要
通过分析确定Q235B钢对接焊接头的振动疲劳S-N曲线与静疲劳S-N曲线是具有相同斜率的连续型曲线,并基于静疲劳S-N曲线推得振动疲劳S-N曲线的表达式.文中通过试验确定了Q235B钢对接焊接头的静疲劳S-N曲线和不同加载频率下对应的真实拉伸强度,确定了振动疲劳修正系数为0.345 2,经过残余应力和接头板厚修正后,利用振动疲劳S-N曲线预测了疲劳寿命为5×106周次时振动疲劳极限为114.84 MPa,与试验值相差仅为7.60%.结果表明,文中所用方法能够用于Q235B钢振动S-N曲线的推断.
The interrelation of static fatigue S- N curve and vibration fatigue S- N curve on Q235 B steel butt welded joints has been analyzed. The result shows they have the same slope,and vibration fatigue S- N curve is a continuous curve without horizontal section. It moves a specified distance in stress axis. At the same time,the vibration fatigue S-N curve expression was input. In this paper,the static fatigue test and tensile test under different load frequency were done. And vibration fatigue correction factor was 0. 345 2. Through correction of residual stress and size,the fatigue limit was 114. 84 MPa when the cycles were 5 × 106 under vibration fatigue S- N curve. And it only has a little bias 7. 60%,it shows that the method of this paper can be used to infer vibration fatigue S- N curve of Q235 B steel.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2014年第8期39-42,115,共5页
Transactions of The China Welding Institution
基金
教育部春晖计划资助项目(Z2006-1-01003)
