摘要
采用 15MHz超声聚焦探头对 45号钢摩擦焊接头进行试验检测 ,根据有限弹性变形理论建立了超声波测定摩擦焊接头残余应力的计算模型 ,并计算出接头中轴向残余应力和径向残余应力的分布规律。结果表明 ,摩擦焊接头焊缝区和近缝区的轴向残余应力为压应力 ,而远离焊缝区域为拉应力 ;接头内径向残余应力在轴心处为压应力 ,随着远离轴心逐渐由拉应力变为压应力 ,在接头边缘区域为拉应力。试验结果还表明材料的各向异性对超声波测定摩擦焊接头残余应力有很重要的影响。比较超声检测轴向应力分布规律与有限元法理论计算结果 ,发现两种方法求得的轴向应力分布规律相近 ,但是本文提出的计算模型将减少残余应力误差 ,对摩擦焊接头残余应力的测定比用有限元法理论计算结果更准确。
In this paper,45 steel friction welded joint is tested by using 15MHz ultrasonic focused transducer and a arithmetic model to calculate the residual stress in the friction welded joint through ultrasonic testing is established based on thetheory of the finite elastic distortion.In addition the distribution laws of axial and radial stressure in the joint are worked out,The results show that the axial stress is press are stress in the weld and nearby area but is pull stress in the far area apart from the weld.The radial stress is press stress in the joint axis and is gradually from press stress chang into pull stress in the area further away from the axis.The experiment results also show that the material anisotropy has important influence on the ultrasonic technique of measuring the residual stress in the friction welded joint.The axial stress distribution law which is got by ultrasonic technique is closing to the law worked out based on the theory of finite element.Besides,the arithmetic model proposed in this paper will decrease the residual stress error,and the method is more accurate than the finite element method in measuring the residual stress in the friction welded joint.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2000年第3期55-58,共4页
Transactions of The China Welding Institution
基金
航空基金资助项目(96BBCD0405)
关键词
超声波
残余应力
测定
ultrasonic
residual stress
measurin■
