3D FE modeling of oblique shot peening using a new periodic cell
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3D FE modeling of oblique shot peening using a new periodic cell Fan Yang • Zhuo Chen • S. A. Meguid
Received: 11 August 2013 / Accepted: 11 November 2013 Ó Springer Science+Business Media Dordrecht 2013
Abstract Oblique incidence is often observed in the peening process due to the geometric complexity of some of the treated targets. Obliquity of the jet stream also exists as a result of the way the shots are propelled. It is therefore the purpose of this study to conduct a realistic 3D finite element (FE) analysis of the peening process involving a large number of shots impinging simultaneously at a rate sensitive target made from Ti-6Al-4V. A novel periodic cell model is developed and used to examine the effect of oblique incidence upon the induced plastic strains and residual stresses. Some aspects of the simulation are first validated against published work in literature. The periodicity of the model is also examined and verified. A parametric study is further conducted to investigate the effect of various parameters involved in peening process using the newly proposed model. Several conclusions are drawn concerning the effect of incident angle, shot diameter and friction coefficient upon the generated residual stress and plastic strain fields. Keywords Shot peening Oblique incidence Finite element Periodic cell model Residual stress
F. Yang Z. Chen S. A. Meguid (&) Mechanics and Aerospace Design Laboratory, University of Toronto, 5 King’s College Road, Toronto, ON M5S 3G8, Canada e-mail: [email protected]
1 Introduction Shot-peening is a cold-working process accomplished by bombarding the surface of the component with small spherical shots at a relatively high impinging velocity. It is widely used to improve the fatigue life of metallic components in aerospace and automobile industries (Meguid 1986; Schulze 2006). The impingement causes an indentation surrounded by a plastic region. After peening, a field of compressive residual stress is left in the near surface layer due to inhomogeneous elasto-plastic deformation. This compressive residual stress is highly beneficial in retarding crack growth under cyclic loading conditions. Therefore, shot peening is a very useful treatment for improving the fatigue resistance of critical load bearing components such as gears, springs, compressor disc assemblies, bogie beam in landing gears, cylinder head, connecting rods and crank shafts in automobiles. The shot peening process is governed by a significant number of parameters (Wu et al. 2012). These include size, density, shape and mechanical properties of the impinging shots, the geometry and mechanical properties of the treated targets, shot mass flow rate, impact velocity, incident angle, stand-off distance from the nozzle and exposure time. In order to control the effectiveness of peening treatment, it is necessary to establish quantitatively the relationship between these parameters and the resulting residual stress pattern. A number of experimental studies have been devoted to investigate the r
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