激光冲击强化下泵头体材料表面残余应力演化仿真及试验研究*

doi:10.16731/j.cnki.1671-3133.2025.06.001

现代制造工程 ›› 2025, Vol. 537 ›› Issue (6): 1-10.doi: 10.16731/j.cnki.1671-3133.2025.06.001

• 试验研究 • 下一篇

激光冲击强化下泵头体材料表面残余应力演化仿真及试验研究^*

周思柱, 杨子彧, 李林, 曾云

长江大学机械工程学院,荆州 434023

收稿日期:2024-11-29 出版日期:2025-06-18 发布日期:2025-07-16
通讯作者: 曾云,博士,副教授,硕士生导师,主要研究方向为石油装备可靠性设计。E-mail:mechanicszy@163.com
作者简介:周思柱,博士,教授,博士生导师,主要研究方向为机械结构强度与振动。E-mail:zhousz@Yangtze.Edu.cn; 杨子彧,硕士研究生,主要研究方向为石油装备可靠性设计。E-mail:1044739380@qq.com
基金资助:
^*国家自然科学基金资助项目(52174018,51674040);武汉科技大学机械传动与制造工程湖北省重点实验室开放基金资助项目(MTMEOF2022B01)

Simulation and experimental research on residual stress evolution on the surface of pump head body material under laser shock strengthening

ZHOU Sizhu, YANG Ziyu, LI Lin, ZENG Yun

School of Mechanical Engineering,Yangtze University,Jingzhou 434023,China

Received:2024-11-29 Online:2025-06-18 Published:2025-07-16

摘要/Abstract

摘要： 聚焦压裂泵泵头体这一油气开采关键部件的使用寿命问题,采用激光冲击强化技术对泵头体材料30CrNi2MoVA进行表面处理,通过数值模拟和试验验证相结合的方式研究了不同光斑搭接率(30 %、50 %和70 %)对材料表面残余应力分布及力学性能的影响规律。采用仿真的方法分析了激光冲击强化前后泵头体内腔的应力分布情况,并结合材料的S-N曲线计算了疲劳寿命。结果表明,利用X射线衍射(X-Ray Diffraction,XRD)试验测得光斑搭接率为30 %、50 %和70 %的表面残余压应力值分别为-690、-666和-567 MPa,随着光斑搭接率的增大,残余压应力和影响层深度减小;光斑搭接率为30 %条件下残余压应力影响层深度达1.580 mm,较其他条件下显著增加;仿真结果与试验之间的误差依次为6.5 %、6.2 %和8.8 %,表明数值模拟结果具有较高的可靠性。同时,光斑搭接率为50 %对材料的力学性能提升最为显著,该条件下材料的延伸强度和抗拉强度分别提高了5.3 %和3.6 %。泵头体内腔的最大等效应力值由激光冲击强化前的599 MPa降低至505 MPa,疲劳寿命由处理前的123 651次增加至398 107次。该研究为激光冲击强化技术在压裂装备领域的应用提供了重要的理论依据和工艺参考,对提升泵头体使用寿命具有积极意义。

关键词: 激光冲击强化, 残余应力, 光斑搭接率, X射线衍射试验

Abstract: Focusing on the service life of the fracturing pump head body,a key component of oil and gas exploitation,and laser shock strengthening technology was used to treat the surface of the pump head material 30CrNi2MoVA,and the influence of different spot overlap rates (30 %,50 % and 70 %)on the residual stress distribution and mechanical properties of the material surface was studied by combining numerical simulation and experimental verification. The stress distribution of the inner cavity of the pump head body before and after laser shock strengthening was analyzed by simulation method,and the fatigue life was calculated by combining the S-N curve of the material. The results show that the residual compressive stress values on the surface measured by X-Ray Diffraction (XRD) test at 30 %,50 % and 70 % spot overlap rates were -690,-666 and -567 MPa,respectively,and the residual compressive stress and the depth of the affected layer decrease with the increase of the spot overlap rate.Under the condition of 30 % spot overlap rate,the depth of the residual compressive stress affected layer was 1.580 mm,which was significantly higher than that under other conditions,and the error between the simulation results and the test was 6.5 %,6.2 % and 8.8 %,respectively,indicating that the numerical simulation results have high reliability. At the same time,the mechanical properties of the material were most significantly improved by the 50 % spot overlap rate,and the elongation strength and tensile strength of the material were increased by 5.3 % and 3.6 %,respectively. The maximum equivalent stress value of the inner cavity of the pump head body was reduced from 599 MPa before laser shock strengthening to 505 MPa after treatment,and the fatigue life increased from 123 651 times before treatment to 398 107 times. This study provides an important theoretical basis and process reference for the application of laser shock strengthening technology in the field of fracturing equipment,and has positive significance for improving the service life of the pump head body.

Key words: laser shock strengthening, residual stress, spot overlap rate, X-Ray Diffraction (XRD) test

中图分类号:

TG144

周思柱, 杨子彧, 李林, 曾云. 激光冲击强化下泵头体材料表面残余应力演化仿真及试验研究^*[J]. 现代制造工程, 2025, 537(6): 1-10.

ZHOU Sizhu, YANG Ziyu, LI Lin, ZENG Yun. Simulation and experimental research on residual stress evolution on the surface of pump head body material under laser shock strengthening[J]. Modern Manufacturing Engineering, 2025, 537(6): 1-10.

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激光冲击强化下泵头体材料表面残余应力演化仿真及试验研究^*

Simulation and experimental research on residual stress evolution on the surface of pump head body material under laser shock strengthening

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