Title: Controlled shot peening simulation for realistic impact pattern characterisation

Authors: G.I. Mylonas; G.N. Labeas

Addresses: Department of Mechanical Engineering and Aeronautics, University of Patras, Laboratory of Technology and Strength of Materials (LTSM), Panepistimioupolis, Rion, 26500, Greece. ' Department of Mechanical Engineering and Aeronautics, University of Patras, Laboratory of Technology and Strength of Materials (LTSM), Panepistimioupolis, Rion, 26500, Greece

Abstract: Representative shot peening (SP) patterns as function of SP process parameters are calculated and presented. The work scrutinises the SP process parameters affecting the development of coverage and residual stresses (RS) by tackling the following phenomena: shot interactions into the shot stream, distribution of coverage on a reference plate surface, probability of non-uniform impact and relationship of adjacent impacts with RS development. The shot stream is simulated with a 2D kinematic model and the real distribution of the two most important SP parameters, i.e., shot velocity and angle are calculated. The effect of adjacent impacts on RS built-up is examined via a finite element (FE) model, resulting to a criterion about the minimum shot distance that affects the RS field. Finally, a stochastic simulation is performed via a germ-grain Boolean model, which simulates the stochastic nature of the process and results to the definition of realistic SP impact patterns.

Keywords: shot peening; shot stream simulation; stochastic analysis; representative patterns; impact patterns; kinematic modelling.

DOI: 10.1504/IJSURFSE.2011.044391

International Journal of Surface Science and Engineering, 2011 Vol.5 No.5/6, pp.381 - 414

Received: 22 Feb 2011
Accepted: 22 Jul 2011

Published online: 24 Dec 2011 *

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