Author(s)

J. Solis Romero, E.R. De Los Rios, A. Levers & S. Karuppanan

Abstract

Towards the optimisation of the shot peening process in terms of fatigue resistance of the 2024-T351 and 7150-T651 aluminium alloys J. Soils Romero', E.R. De Los Rios', A. Levers^ & S. Karuppanan' ' SIRIUS, Faculty of Engineering, University of Sheffield, SI 3JD British Aerospace Airbus, Chester, U.K. Abstract The effect of the shot peening process on the surface changes occurring in the 2024-T351 and 7150-T651 aluminium alloys are examined using a design of experiments approach. Shot size, incidence angle, intensity and coverage were considered to be the main control factors. A mathematical method of obtaining the peening intensity at saturation point, from Almen strips peened for different length of time, was developed. Coverage results, determined experimentally, using image analysis, are shown to be consistent with predictions obtained using the Avrami and Holdgate theoretical methods. The important material parameters affected by shot peening, which are associated with changes i

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