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A combined DEM-FEM numerical method for Shot Peening parameter optimisation

Lookup NU author(s): Professor Stefano Utili


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A numerical modelling approach capable of simulating Shot Peening (SP) processes of industrial interestwas developed by combining the Discrete Element Method (DEM) with the Finite Element Method (FEM).In this approach, shot–shot and shot–target interactions as well as the overall shot flow were simulatedefficiently using rigid body dynamics. A new algorithm to dynamically adapt the coefficient of restitution(CoR) for repeated impacts of shots on the same spot was implemented in the DEM code to take intoaccount the effect of material hardening. Then, a parametric study was conducted using the Finite ElementMethod (FEM) to investigate the influence of the SP parameters on the development of residualstresses.Finally, a two-step coupling method is presented to combine the output of DEM simulation with FEManalyses to retrieve the Compressive Residual Stresses (CRS) after multiple impacts with the aim to evaluatethe minimum area required to be modelled to realistically capture the field of residual stresses. Aseries of such coupled analyses were performed to determine the effect of peening angle and the combinationof initial velocity and mass flow rate on CRS.

Publication metadata

Author(s): Murugaratnam K, Utili S, Petrinic N

Publication type: Article

Publication status: Published

Journal: Advances in Engineering Software

Year: 2015

Volume: 79

Pages: 13-26

Print publication date: 10/01/2015

Online publication date: 30/09/2014

Acceptance date: 07/09/2014

ISSN (print): 0965-9978

ISSN (electronic): 1873-5339

Publisher: Elsevier


DOI: 10.1016/j.advengsoft.2014.09.001


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