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Open AccessArticle

# Mathematical Model and Verification of Residual Stress Induced by Water Jet Peening

by 1,2,*, 1,2, 1,2,*, 1,2, 1,2, 1,2, 1,2 and
1
School of Mechanical Engineering, Zhengzhou University, Zhengzhou 450001, China
2
Henan Key Engineering Laboratory for Anti-Fatigue Manufacturing Technology, Zhengzhou 450001, China
3
Ministry of Education & Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan 430080, China
*
Authors to whom correspondence should be addressed.
Metals 2019, 9(9), 936; https://doi.org/10.3390/met9090936
Received: 29 July 2019 / Revised: 17 August 2019 / Accepted: 19 August 2019 / Published: 27 August 2019
(This article belongs to the Special Issue Advanced Surface Modification Technologies)
The water jet peening (WJP) technology can induce compressive residual stress (RS) in metal surfaces and, thus, improve the fatigue life of components. In this paper, a mathematical model is proposed for calculating the RS induced by WJP. To validate the proposed mathematical model, experimental and finite element simulation verifications were carried out on Al6061-T6. The distribution of RS along the depth direction, the maximum compressive RS, and the depth of the compressive RS layer were also investigated based on the mathematical model. Results showed that the error of maximum compressive RS between the mathematical model and experiment was within 9% under a jet pressure of 60 MPa, and the error of depth of the compressive RS layer between the mathematical model and experiment was within 13% under a jet diameter of 0.3 mm. Hence, the mathematical model is reliable and accurate. The maximum compressive RS increases with the increase in jet pressure, and the depth of the compressive RS layer approximately linearly increases with the increase in jet diameter. View Full-Text
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MDPI and ACS Style

He, Z.; Li, C.; Zhao, S.; Cui, B.; Li, D.; Yu, H.; Chen, L.; Fu, T. Mathematical Model and Verification of Residual Stress Induced by Water Jet Peening. Metals 2019, 9, 936.

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