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Research Papers: Materials and Fabrication

Experimental and Numerical Analysis of Water Jet Peening on 6061 Aluminum Alloy

[+] Author and Article Information
Zhanshu He

School of Mechanical Engineering,
Zhengzhou University,
Zhengzhou 450001, China
e-mail: hezhanshu@qq.com

Shusen Zhao

School of Mechanical Engineering,
Zhengzhou University,
Zhengzhou 450001, China
e-mail: zsscn1994@163.com

Ting Fu

Key Laboratory of Metallurgical Equipment and
Control Technology,
Wuhan University of Science and Technology,
Wuhan 430080, China

Lei Chen, Yuanxi Zhang, Meng Zhang, Peizhuo Wang

School of Mechanical Engineering,
Zhengzhou University,
Zhengzhou 450001, China

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received September 16, 2017; final manuscript received December 24, 2017; published online February 22, 2018. Assoc. Editor: David L. Rudland.

J. Pressure Vessel Technol 140(2), 021406 (Feb 22, 2018) (11 pages) Paper No: PVT-17-1184; doi: 10.1115/1.4039071 History: Received September 16, 2017; Revised December 24, 2017

Water jet peening (WJP) is a mechanical surface strengthening process, which can improve the residual stress (RS) of the peened surface and then improve the fatigue life of components. In this paper, erosion experiments are conducted to investigate the influence of peening parameters on erosion. On this basis, RSs induced by WJP are studied in relation to the peening parameters. In addition, the coupled Eulerian–Lagrangian (CEL) technique is used to model and simulate the dynamic impact process of WJP on Al6061-T6. The influence of peening parameters such as jet pressure p, jet traverse velocity vf, and the number of water jet pass n on the modification of residual stress field (RSF) is examined by simulation and experiment. The influence of incidence angle α and water jet diameter d on RSF is also investigated by simulation. Results show that compressive RS σcrs is a result of the action of water-hammer pressure alone. Furthermore, σcrs increases with an increase in p, n and α. The optimal peening parameters for Al6061-T6 are found to be p = 60 MPa, vf = 2000 mm/min, n = 4, α = 90 deg and d = 2.0 mm. Finally, the depth of compressive RS layer D0 increases greatly with an increase in water jet diameter d and can reach 984 μm.

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References

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Figures

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Fig. 1

Morphology of a water jet propagating in air and this is not to scale [18]

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Fig. 2

Image of the experimental apparatus (DWJ1525-FC)

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Fig. 3

Surfaces of peened specimens are obtained as a result of (a) the erosion and (b) WJP experiment

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Fig. 4

Modeling arrangement

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Fig. 5

(a) FE model of the dynamical impact process of WJP and (b) time history of jet pressure at the center of the jet impact region

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Fig. 6

(a) Change history of material stress in WJP process and (b) postpeening plastic strain at the center of the jet impact region

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Fig. 7

Erosion cross section of postpeening specimen

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Fig. 8

Overview of erosion mechanism [16]

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Fig. 9

Influence of jet pressure on the erosion. Jet conditions: vf = 500 mm/min, n = 1, α = 90 deg, d = 0.3 mm. (a) p = 40 MPa, (b) p = 60 MPa, (c) p = 70 MPa, and (d) p = 80 MPa.

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Fig. 10

Influence of jet traverse velocity on the erosion. Jet conditions: p = 70 MPa, n = 1, α = 90 deg, d = 0.3 mm. (a) vf = 500 mm/min, (b) vf = 1000 mm/min, (c) vf = 1500 mm/min, and (d) vf = 2000 mm/min.

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Fig. 11

Influence of number of jet pass on the erosion. Jet conditions: p = 40 MPa, vf = 500 mm/min, α = 90 deg, d = 0.3 mm. (a) n = 1, (b) n = 2, (c) n = 3, and (d) n = 4.

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Fig. 12

Influence of incidence angle on the erosion. Jet conditions: p = 80 MPa, vf = 500 mm/min, n = 1, d = 0.3 mm. (a) α = 30 deg, (b) α = 45 deg, (c) α = 60 deg, and (d) α = 90 deg.

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Fig. 13

(a) Contour of the RS after peening and (b) simulation results and measured results of RS. Jet conditions: p = 40 MPa, n = 1, α = 90 deg, d = 0.3 mm, vf = 2000 mm/min.

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Fig. 14

Distribution of postpeening RS along the depth direction for different jet pressures p. Jet conditions: vf = 2000 mm/min, n = 1, α = 90 deg, d = 0.3 mm. (a) Simulation results and (b) experimental results.

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Fig. 15

Distribution of postpeening RS along the depth direction for different Jet traverse velocity vf. Jet conditions: p = 40 MPa, n = 1, α = 90 deg, d = 0.3 mm. (a) Simulation results and (b) experimental results.

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Fig. 16

Distribution of postpeening RS along the depth direction for different jet passes n. Jet conditions: p = 40 MPa, vf = 2000 mm/min, α = 90 deg, d = 0.3 mm. (a) Simulation results and (b) experimental results.

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Fig. 17

Distribution of postpeening RS along the depth direction for different incidence angles α. Jet conditions: p = 60 MPa, vf = 2000 mm/min, n = 1, d = 0.3 mm.

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Fig. 18

Distribution of postpeening RS along the depth direction for different water jet diameters d. Jet conditions: p = 60 MPa, vf = 2000 mm/min, n = 1, α = 90 deg.

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