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Experimental and Numerical Simulation to Study the Reduction of Welding Residual Stress by Ultrasonic Impact Treatment

1
School of New Energy, China University of Petroleum (East China), Qingdao 266580, China
2
Technology Inspection Center of Shengli Oil Field China Petroleum & Chemical Corporation, Dongying 257000, China
3
College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(4), 837; https://doi.org/10.3390/ma13040837
Received: 21 December 2019 / Revised: 17 January 2020 / Accepted: 21 January 2020 / Published: 12 February 2020
(This article belongs to the Section Structure Analysis and Characterization)
In this study, the effects of ultrasonic impact treatment (UIT) on the residual stress in a repair welding joint are investigated by experimental and finite element methods. A three-dimensional numerical analysis approach including a thermomechanical-coupled welding simulation and dynamic elastic-plastic UIT simulation is developed, which has been validated by X-ray diffraction measurement and indentation strain method. The results show that longitudinal residual stresses basically turned into the small tensile stress state from the large tensile stress state, and transverse residual stresses have mainly turned into compressive stresses from large tensile stress after the UIT. In the thickness direction, the average decrease of longitudinal residual stress is 259.9 MPa, which is larger than the 149.1 MPa of transverse residual stress. The calculated residual stress distribution after the UIT of the thin plate is compared with that of the thick plate in the literature, with the results showing the stress accumulation layer inside the thick plate. The simulation results show that the elastic strains are decreased slightly and the equivalent plastic strain is increased markedly after UIT, which explains the mechanism of residual stress relaxation. View Full-Text
Keywords: welding residual stress; ultrasonic impact treatment; X-ray diffraction; indentation strain method; finite element simulation welding residual stress; ultrasonic impact treatment; X-ray diffraction; indentation strain method; finite element simulation
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Chen, J.; Chu, J.; Jiang, W.; Yao, B.; Zhou, F.; Wang, Z.; Zhao, P. Experimental and Numerical Simulation to Study the Reduction of Welding Residual Stress by Ultrasonic Impact Treatment. Materials 2020, 13, 837.

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