耦合焊接残余应力的横波可控震源振动器平板疲劳寿命预测  

Fatigue life prediction of sheer wave vibroseis vibrator baseplate coupled with welding residual stress

作　　者：陈振 陈能鹏[2] 冉庆杰 王乔木 魏超成 鞠浩文 CHEN Zhen;CHEN Nengpeng;RAN Qingjie;WANG Qiaomu;WEI Chaocheng;JU Haowen(Sichuan Key Laboratory of Shale Gas Evaluation and Exploitation,Chengdu 610500,China;School of Mechatronic Engineering,Southwest Petroleum University,Chengdu 610500,China;Petroleum and Natural Gas Equipment Technology,Sichuan Province Science and Technology Resource Sharing Service Platform,Chengdu 610500,China)

机构地区：[1]页岩气评价与开采四川省重点实验室,四川成都610500 [2]西南石油大学机电工程学院,四川成都610500 [3]石油天然气装备技术四川省科技资源共享服务平台,四川成都610500

出　　处：《工程设计学报》2025年第1期102-111,共10页Chinese Journal of Engineering Design

基　　金：四川省科技厅自然科学基金面上项目(2024NSFSC0094)。

摘　　要：振动器平板是耦合横波可控震源振动器与大地的关键媒介,而平板齿与平板的焊接部位在地震波激发工况下受力复杂,易发生疲劳失效,导致平板的使用寿命较低。针对传统结构疲劳寿命分析方法不考虑焊接残余应力的问题,采用等应变原理建立应力耦合准则,并对平板焊接焊缝危险部位开展焊接残余应力与工作载荷应力的耦合计算。随后,基于修正的S—N曲线和耦合应力谱,采用Miner准则分析平板在焊接残余应力与工作载荷应力耦合作用下的疲劳寿命。结果表明:在焊接残余应力与工作载荷应力的耦合作用下,平板发生疲劳破坏的工作寿命为8.69a,与实际8a工作寿命的相对误差为8.6%。耦合焊接残余应力的振动器平板疲劳寿命预测方法具有较高的精度和稳定性,可为横波可控震源的维护与优化提供新的思路与方法。Vibrator baseplate is the key medium for coupling shear wave vibroseis vibrator with earth,while the welding part of baseplate teeth and baseplate is prone to fatigue failure due to complex force under the condition of seismic wave excitation,which leads to low service life of baseplate.In view of the problem that the welding residual stress was not considered in the traditional structure fatigue life analysis method,the stress coupling criterion was established by using the equal strain principle,and the coupling calculation of welding residual stress and working load stress was carried out for the dangerous parts of the baseplate welding seam.Then,based on the modified S-N curve and coupled stress spectrum,the Miner criterion was used to analyze the fatigue life of baseplate under the coupling of welding residual stress and working load stress.The results showed that the fatigue failure life of the baseplate under the coupling of welding residual stress and working load stress was 8.69 a,and the relative error with the actual working life of 8 a was 8.6%.The fatigue life prediction method of vibrator baseplate coupled with welding residual stress has high accuracy and stability,which can provide a new idea and method for the maintenance and optimization of shear wave vibroseis.

关 键 词：横波可控震源 振动器平板 焊接残余应力 工作载荷应力 应力耦合 S—N曲线 

分 类 号：TH14[一般工业技术—材料科学与工程]