Title: Investigation on shot-peening induced residual stress field

Authors: Georgios I. Mylonas, Ulrike Heckenberger, Georgios N. Lampeas

Addresses: Laboratory of Technology and Strength of Materials (LTSM), Department of Mechanical Engineering and Aeronautics, University of Patras, Panepistimioupolis, Rion 26500, Patras, Greece. ' EADS Innovation Works – Dept. IW-MS, 81663 Munich, Germany. ' Laboratory of Technology and Strength of Materials (LTSM), Department of Mechanical Engineering and Aeronautics, University of Patras, Panepistimioupolis, Rion 26500, Patras, Greece

Abstract: An investigation of a shot peening induced residual stress field in an aluminium alloy plate is performed both experimentally, as well as by developing a numerical simulation model capable of predicting the residual stress profile. Shot peening induced residual stresses are measured by the hole drilling technique. Experimental results provide through-the-thickness residual stress profiles of shot peening treated AA7449-T7651 plates under different shot intensities. Experimentally measured residual stresses are compared to the respective residual stress distributions computed by the finite element model for verification and validation purposes. The numerical model comprises a single steel shot impacting on the aluminium target plate. The steel shot is considered as elastic deformable body, while the target aluminium plate material is considered elastic-plastic with strain hardening. After its successful validation, the numerical model is applied to the parametric study of the effect of shot velocity and shot size on the induced residual stress profile.

Keywords: shot peening; finite element analysis; FEA hole drilling; residual stress; aluminium alloys; modelling; elastic deformation; strain hardening; shot velocity; shot size.

DOI: 10.1504/IJMMP.2010.037623

International Journal of Microstructure and Materials Properties, 2010 Vol.5 No.4/5, pp.471 - 480

Published online: 20 Dec 2010 *

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