Use of Cavitating Jet for Introducing Compressive Residual Stress

[+] Author and Article Information
H. Soyama, M. Saka

Department of Mechanical Engineering, Tohoku University, Aoba 01, Aramaki, Aoba-ku, Sendai 980-8579, Japan

J. D. Park

Department of Vehicle Engineering, Kyung-Nam Junior College, 167 Jurae-dong, Sasang-ku, Pusan 616-012, Korea

J. Manuf. Sci. Eng 122(1), 83-89 (Sep 01, 1999) (7 pages) doi:10.1115/1.538911 History: Received November 01, 1998; Revised September 01, 1999
Copyright © 2000 by ASME
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Principal stresses of residual stress obtained from three normal stresses (SUS316, σ=0.01,p1=20 MPa,sopt=20 mm,t=10 s)
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Residual stress distribution changed by a cavitating jet (SUS316, σ=0.01,p1=20 MPa,sopt=20 mm)
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Cavitation intensity revealed by mass loss under several cavitating conditions (A1050P)
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Schematic diagram of impinging jets in air and water
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Test section of a cavitating jet apparatus
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Coordinates of stress measurements
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Effective area of a cavitating jet shown by eroded area of an aluminum specimen (A1050P, σ=0.01,p1=20 MPa,sopt=20 mm,t=90 s)
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Residual stress on the surface changing with exposure time to jet (SUS316, σ=0.01,p1=20 MPa,sopt=20 mm)
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Mass loss and residual stress versus time (SUS304, specimen No. 1, σ=0.01,p1=20 MPa,sopt=20 mm)
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Maximum roughness, mass loss and residual stress versus time (SUS304, specimen Nos. 1 & 2, σ=0.01,p1=20 MPa,sopt=20 mm)
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Peened aspect observed by SEM (SUS304, specimen No. 2, σ=0.01,p1=20 MPa,sopt=20 mm). (a) smooth surface of specimen (t=10 s); (b) cracks in the cross section of specimen (t=60 min).
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Mass loss and residual stress versus time of copper (C1100, σ=0.01,p1=20 MPa,sopt=20 mm)
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Formation of compressive residual stress under several cavitating conditions (SUS316)




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