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A theoretical and experimental investigation into the development of coverage in shot peening

Karuppanan, Saravanan (2000) A theoretical and experimental investigation into the development of coverage in shot peening. Masters thesis, The University of Sheffield .

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Shot peening is a mechanical surface treatment process used mainly for the improvement of the fatigue structural integrity of metallic components. In this process, the surface of a part is bombarded with small spherical media called shot, at high velocity, to induce desirable residual compressive stresses and strains within the surface layers of the component The effectiveness of the shot peemng process 1s dependent upon the uniformity of the induced compressive residual stresses and the energy transfer that occurs during the impact of the shots with the target surface. In practice, the process efficiency is established by means of coverage, intensity and saturation. Therefore, the scope of this study is to investigate the development of coverage and its relationship to intensity and saturation of peening. Within the scope, the objectives of the study are to compare and contrast the coverage results obtained experimentally with theoretical models, to establish a relationship between coverage and intensity and to obtain an empirical relationship to predict coverage. Theoretical models used to predict coverage give mixed results compared to experimental results. The Holdgate model gives a very good coverage prediction whereas the A vrami equation does not Coverage development is found to be a function of shot size, impingement angle and target material properties. Intensity and saturation time is found to be dependent upon shot size and impingement angle. Complete coverage is achieved earlier than the saturation point which 1s a contrast to the usual assumption that coverage and saturation occurs at the same time. However, a clear relationship could not be established. An empirical relationship can be used to predict coverage. This relationship, which is a function of the process parameters such as shot size and impingement angle, is established by using multiple regression analysis.

Item Type: Thesis (Masters)
Academic Subject : Academic Department - Mechanical Engineering - Materials - Advanced engineering materials - Processings and applications of metals alloys
Subject: T Technology > TJ Mechanical engineering and machinery
Divisions: Engineering > Mechanical
Depositing User: Users 2053 not found.
Date Deposited: 30 Sep 2013 16:55
Last Modified: 02 Oct 2019 18:59
URI: http://utpedia.utp.edu.my/id/eprint/7787

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