Modern Manufacturing Engineering ›› 2025, Vol. 537 ›› Issue (6): 1-10.doi: 10.16731/j.cnki.1671-3133.2025.06.001

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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   

  1. School of Mechanical Engineering,Yangtze University,Jingzhou 434023,China
  • Received:2024-11-29 Online:2025-06-18 Published:2025-07-16

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

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