Abstract
The role of the initial residual stresses (IRS) induced by the milling on the efficacy of laser shock peening (LSP) was investigated numerically on IN718 specimens. Three milling conditions exhibiting high (3.5 μm), medium (1.1 μm), and low (0.6 μm) surface roughness were considered for LSP. Experimentally measured (from XRD) milling-induced sub-surface (up to 60 μm depth) residual stresses were introduced into the simulations of LSP as predefined fields. The role of spot diameter with the IRS on the LSP-induced residual stress was studied systematically. For most cases, the tensile IRS from milling caused a significant decrease in the magnitude of maximum compressive residual stresses induced by LSP.
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Acknowledgments
The authors are grateful to IIT-Hyderabad and DMRL for the support provided during the course of this study. Special thanks are due to Dr. T. Jayakumar, Retd. DRDO Fellow and Fmr Scientist IGCAR, Prof. P. Prem Kiran, and Prof Jay Prakash Gautam from the University of Hyderabad for the extensive discussions carried out during the study.
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This invited article is part of a special topical issue of the Journal of Materials Engineering and Performance on Residual Stress Analysis: Measurement, Effects, and Control. The issue was organized by Rajan Bhambroo, Tenneco, Inc.; Lesley Frame, University of Connecticut; Andrew Payzant, Oak Ridge National Laboratory; and James Pineault, Proto Manufacturing on behalf of the ASM Residual Stress Technical Committee.
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Singh, A., Chinthapenta, V. & Mylavarapu, P. Efficacy of Laser Shock Peening Post-milling: A Semi-numerical Study. J. of Materi Eng and Perform 33, 4106–4113 (2024). https://doi.org/10.1007/s11665-024-09241-9
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DOI: https://doi.org/10.1007/s11665-024-09241-9