A Scaling Law In Shot Peening Induced Surface Material Property Deviations

Author:  A.M. Frishman, C.C.H. Lo, Y. Shen, and N. Nakagawa
Source:  Conf Proc: ICSP-10 Tokyo, Japan 2008
Doc ID:  2008064
Year of Publication:  2008
ABSTRACT This paper presents a theory of shot-induced material property deviations near the component surface. Our analysis shows that, with shot peening being the common cause, there exists a universal scaling law among seemingly unrelated material property deviations under varying peening conditions. The main contribution of this paper is to show the existence and utility of the scaling law. We explicitly present scaling behaviors of several material property deviations under varying Almen intensities, and validate the predicted scaling relations against experimental data. Assuming the scaling law holds, we also show how to use it as a tool to control peening processes, by predicting, e.g., residual stress profiles at varying Almen intensities. The scaling law is also found useful in assuring consistency among nondestructive characterization measurements. KEY WORDS Shot Peening, Almen Intensity, Residual Stress, Cold Work, Scaling Law

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