现代制造工程Issue(6)：1-10,10.DOI:10.16731/j.cnki.1671-3133.2025.06.001
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
摘要
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 differ-ent spot overlap rates(30％,50％ and 70％)on the residual stress distribution and mechanical properties of the material sur-face 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 signifi-cantly 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 prop-erties 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.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Key words
laser shock strengthening/residual stress/spot overlap rate/X-Ray Diffraction(XRD)test分类
矿业与冶金引用本文复制引用
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,(6):1-10,10.基金项目
国家自然科学基金资助项目(52174018,51674040) （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) （MTMEOF2022B01）
