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

doi:10.3785/j.issn.1006-754X.2025.04.145

Chinese Journal of Engineering Design

2025, Vol. 32

Issue (1): 102-111 DOI: 10.3785/j.issn.1006-754X.2025.04.145

Reliability and Quality Design

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

Zhen CHEN^1,^2,³(

),Nengpeng CHEN²(

),Qingjie RAN²,Qiaomu WANG²,Chaocheng WEI²,Haowen JU²

^1.Sichuan Key Laboratory of Shale Gas Evaluation and Exploitation, Chengdu 610500, China
^2.School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China
^3.Petroleum and Natural Gas Equipment Technology, Sichuan Province Science and Technology Resource Sharing Service Platform, Chengdu 610500, China

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Abstract

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.

Key words： sheer wave vibroseis vibrator baseplate welding residual stress working load stress stress coupling S-N curve

Received: 27 May 2024 Published: 04 March 2025

CLC:

TH 14

Corresponding Authors: Nengpeng CHEN E-mail: 117976897@qq.com;2624134676@qq.com

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	Zhen CHEN
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Cite this article:

Zhen CHEN,Nengpeng CHEN,Qingjie RAN,Qiaomu WANG,Chaocheng WEI,Haowen JU. Fatigue life prediction of sheer wave vibroseis vibrator baseplate coupled with welding residual stress. Chinese Journal of Engineering Design, 2025, 32(1): 102-111.

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https://www.zjujournals.com/gcsjxb/10.3785/j.issn.1006-754X.2025.04.145 OR https://www.zjujournals.com/gcsjxb/Y2025/V32/I1/102

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

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8.69 a，与实际8 a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。

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

Fig.1 Double ellipsoid heat source model

参数	数值
$q f$ /(W·mm^-3)	44.0
$q r$ /(W·mm^-3)	36.7
$a f$ /mm	3
$a r$ /mm	6
b/mm	4
c/mm	2
Q/W	4 004

Table 1 Parameters of double ellipsoid heat source model

Fig.2 Welding heat source model of vibrator baseplate and baseplate tooth

Fig.3 Welding model of vibrator baseplate and its mesh division

Table 2 Welding process parameters

Fig.4 Welding residual stress field of vibrator baseplate

Fig.5 Welding residual stress of vibrator baseplate along welding direction

Fig.6 Grid division of vibrator baseplate-earth coupling model

Fig.7 Structure schematic of vibrator

Fig.8 Load variation curve of vibrator baseplate

Fig.9 Application form of vibrator baseplate load

Fig.10 Working load stress of each dangerous node at the bottom weld of vibrator baseplate

Fig.11 Working load stress of XS3M node at the bottom weld of vibrator baseplate

Fig.12 Equivalent welding residual stress of vibrator baseplate along welding direction

Fig.13 Coupling stress variation curve at XS3M node of vibrator baseplate

参数	数值	来源
尺寸系数C_D	0.782	《抗疲劳设计手册》^[28]
表面状态系数β	0.850	表面加工工艺采用粗车加工
有效应力集中系数 $K f$	1.740	文献[29]中对应的材料应力集中系数确定方法

Table 3 Modified parameters of S-N curve of vibrator baseplate

Fig.14 S-N curves of vibrator baseplate before and after correction

Table 4 Fatigue damage of vibrator baseplate under each stress level

Table 5 Fatigue life of each dangerous node of vibrator baseplate


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