Assessment of Coverage Developed in Shot Peened Component: DEM-FEM Approach

Aghogho Bright Edward
University of Pretoria
Mechanical and Aeronautical Engineering
Prof. P.S. Heyns

Shot peening (SP) is a mechanical surface treatment use in enhancing the fatigue integrity of treated components if properly controlled. Practically, the efficiency of the peening process is quantified by the coverage, intensity and saturation. Modeling and simulating the shot peening process for parameters optimization, is the most economical and viable alternative compared with experimental option. However, beneficial surface coverage, which is the most important variable is lacking, consideration available works in literature.

A DEM-FEM framework initially developed for assessing induced Compressive Residual Stresses (CRS) [1], was used to understudy the sequential coupling of EDEM/ANSYS with specific focus on the facets and mesh compatibility. The aim is to assess the surface coverage developed with time/passes during the SP process. With the aid of EDEM, variations in surface coverage due to different relative movement between the nozzle and peened component were investigated. This enhancement of coverage assessment in the simulation of SP, paves way for a realistic parameter optimization, which is of industrial relevance.

Surface coverage can be quantified by color density analysis from the images obtained, using image analyzers such as sigma scan, Image-J e.t.c., thus eliminating the limitations associated with visual inspection which is subjective.

Ref 1: Shot peening modeling and simulation for RCS assessment, in Procedia Manufacturing, Vol 7C, 2016, pp 172-177, ELSEVIER Pub.

The flexibility with which EDEM can be Tailored/ manipulated to achieve a task, in conjunction with its coupling to structural analysis tools, is a forerunner in bringing industrial relevance into research.

Aghogho Bright Edward University of Pretoria