考虑焊后热处理的可控震源平板疲劳寿命预测研究  

Stress response analysis and fatigue life prediction of baseplate with seismic source,considering post-weld heat treatment

作　　者：陈振[1] 王乔木 黄志强[1] 张森吉 敬爽[1] 郝磊 帅军 CHEN Zhen;WANG Qiaomu;HUANG Zhiqiang;ZHANG Senji;JING Shuang;HAO Lei;SHUAI Jun(Department of Mechatronic Engineering,Southwest Petroleum University,Chengdu 610500,China;Bureau of Geophysical Prospecting,China National Petroleum Corporation,Zhuozhou 072751,Hebei,China)

机构地区：[1]西南石油大学机电工程学院,成都610500 [2]中国石油集团东方地球物理公司,河北涿州072751

出　　处：《安全与环境学报》2025年第4期1359-1369,共11页Journal of Safety and Environment

基　　金：四川省科技厅自然科学基金面上项目(2024NSFSC0094);页岩气评价与开采四川省重点实验室资助项目(YSK2022013)。

摘　　要：为提高可控震源平板(Seismic Vibrator Baseplate,SVB)在激振过程中应力响应与疲劳寿命预测的准确性,研究综合考虑了SVB的焊接残余应力和焊后热处理问题,并按照焊接、热处理和SVB激振的顺序进行了数值模拟分析。分别构建了SVB焊接模型与SVB-大地耦合模型,并对模型进行了验证。使用MARC软件对SVB进行了焊接模拟和热处理分析,并对焊接热处理后的SVB进行了应力响应分析。此外,基于数值分析结果,应用Miner理论,通过修正S-N曲线对SVB的疲劳寿命进行了预测。研究结果显示:经过热处理后,SVB的整体应力显著减小且分布更加均匀。最大应力从689.1 MPa下降至400.2 MPa,应力释放超过41.92%,显著提高了SVB的疲劳强度。在激振时,SVB的应力增加且分布不均匀。其中,SVB齿尖处的最大应力上升至595.6 MPa,SVB齿焊缝区域的应力达到434.4 MPa。通过修正S-N曲线法计算得到SVB的疲劳寿命为9.57 a,与现场统计的8.71 a相比,误差为9.87%。研究可为SVB的结构设计与寿命优化提供理论依据和参考。To enhance the accuracy of stress response and fatigue life predictions for the Seismic Vibrator Baseplate(SVB)during the excitation process,this study incorporates Welding Residual Stress(WRS)and post-weld heat treatment.Numerical simulations were conducted in a sequential manner,following the processes of welding,heat treatment,and SVB excitation.In this paper,we developed a welding model for the SVB and a coupling model between the SVB and the ground.These models were validated using thermal cycle curves of the weld nodes and elastic wave velocity curves of the ground,respectively.The MARC finite element software was utilized to simulate the welding process and analyze the post-weld heat treatment of the SVB.Subsequently,the residual stresses resulting from the heat treatment were applied as a preload to the SVB,and the stress response was analyzed.Finally,using the results from the numerical analysis,the fatigue life of the SVB was predicted by adjusting the S N curve according to Miner s theory.The study findings indicated that the overall stress level of the SVB was significantly reduced and more evenly distributed following heat treatment.The maximum stress value decreased from 689.1 MPa to 400.2 MPa,resulting in a stress reduction of over 41.92%,which significantly enhanced the fatigue strength of the SVB.During excitation,the stresses in the SVB increased significantly and were unevenly distributed.Notably,the maximum stress at the tip of the SVB teeth reached 595.6 MPa,while the stress in the weld region of the SVB teeth peaked at 434.4 MPa.The calculated fatigue life of the SVB is 9.57 a,showing a 9.87%deviation from the field statistic of 8.71 a.The findings of this study provide a theoretical foundation and valuable reference for the structural optimization and lifespan enhancement of the SVB.

关 键 词：安全工程 横波可控震源平板 有限元分析 疲劳寿命预测 修正S-N曲线 

分 类 号：X941[环境科学与工程—安全科学]