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Article

Relaxation of Peening Residual Stresses Due to Cyclic Thermo-Mechanical Overload

[+] Author and Article Information
S. A. Meguid, G. Shagal, J. C. Stranart

Department of Mechanical and Industrial Engineering, University of Toronto, 5 King’s College Road, Toronto, Ontario, M5S 3G8 Canada

Tel: (416) 978-5741

K. M. Liew, L. S. Ong

School of Mechanical and Production Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798

J. Eng. Mater. Technol 127(2), 170-178 (Apr 06, 2005) (9 pages) doi:10.1115/1.1867986 History: Received July 08, 2004; Revised January 08, 2005; Online April 06, 2005
Copyright © 2005 by ASME
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Figures

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FE model of multiple impingements of multiple shots with subsequent cyclic loading: (a) full model, and (b) discretized symmetry cell
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Typical triangular cyclic loading with different R-ratios
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Stress–strain relationship for AISI 4340 steel: (a) quasistatic uniaxial stress–strain curves for different temperatures, and (b) the normalized effective yield stress σyy0 accounted for strain-rate sensitivity
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Comparison between experimental data 20 and FE prediction: (a) residual stress relaxation at the specimen top surface for different applied surface stress magnitudes, and (b) residual stress relaxation at the top and bottom surfaces for applied surface stress magnitude of 700 MPa
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Residual stress contours in peened target for three consecutive stages: (a) after peening, (b) for the first loading cycle at the maximum normalized applied stress σmaxy=1.57, and (c) after first unloading
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Residual stress relaxation time history during triangular cyclic loading
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Residual stress relaxation for triangular applied cyclic stress: (a) versus number of cycles for a point 156 μm beneath the target surface, and (b) versus depth after 30 cycles
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Effect of R-ratio σminmax of applied cyclic stress upon residual stress distribution after 30 cycles
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Effect of peening velocity upon residual stress distribution for triangular applied cyclic stress: (a) after peening before applied cyclic loading, and (b) after 30 cycles
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Effect of material hardening model upon residual stress relaxation for different R-ratios and for the maximum applied cyclic stress σmaxy=1.57
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Residual stress relaxation for cyclic thermal and combined loadings: (a) versus number of cycles for a point 156 μm beneath the target surface, and (b) versus depth after 30 cycles
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Effect of phase shift between mechanical and thermal loadings upon residual stress relaxation after 30 cycles

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