薄板对接超声疲劳试样设计方法及其误差分析  

Design method and error analysis of thin plate butt welded joint specimen for ultrasonic fatigue test

作　　者：王颖[1,2] 王东坡[1] 丁吉坤[3] 邓彩艳 吴良晨[1] WANG Ying;WANG Dongpo;DING Jikun;DENG Caiyan;WU Liangchen(School of Material Science and Engineering,Tianjin Key Laboratory of Advanced Joining Technology,Tianjin University,Tianjin 300072,China;Patent Examination Cooperation Tianjin Center of the Patent Office SIPO,Tianjin 300304,China;Tianjin Long March Launch Vehicle Manufacturing Co.,Ltd,Tianjin 300462,China)

机构地区：[1]天津大学材料科学与工程学院天津市先进连接技术重点实验室,天津300072 [2]国家知识产权局专利局专利审查协作天津中心,天津300304 [3]天津航天长征火箭制造有限公司,天津300462

出　　处：《焊接学报》2019年第1期71-74,164,共5页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51275343);天津市基金资助项目(09JCYBJC05100)

摘　　要：采用解析法得到了含中部等截面段狗骨形薄板超声疲劳试样谐振长度的计算公式,并得出沿谐振长度方向的位移及应力幅分布函数.为了验证上述计算方法用于薄板对接超声疲劳试样设计的精确度,对考虑与不考虑焊缝余高时的薄板试样与薄板对接试样分别建立有限元模型并进行模态分析.结果表明,采用上述计算方法进行薄板超声疲劳试样设计的频率误差小于1%,且对比得出由于焊缝余高的存在使得其频率误差增大约1.7%.另外,采用上述方法设计了低合金钢Q345薄板对接超声疲劳试样,通过超声疲劳试验进一步验证了上述方法的精确度.The calculation formula of the resonance length of the dog-bone-shaped thin plate specimen with middle equal section for ultrasonic fatigue test was obtained by analytical solution,meanwhile the distribution functions of the displacement and stress amplitude along the resonance length were given.Considering weld reinforcement or not,finite element models of thin plate specimen and thin plate butt specimen were built respectively,and then modal results were analyzed.The results showed that the relative frequency error of the analytical method is less than 1%,while the frequency error caused by the weld reinforcement increased by about 1.7%.Moreover,the thin plate butt specimen of low-alloy steel Q345 was designed based on the above method,and then ultrasonic fatigue tests were conducted to verify the accuracy of the resonant frequency.

关 键 词：超声疲劳 试样设计 有限元 误差 

分 类 号：TG405[金属学及工艺—焊接]