Quantification of the Effects of Various Levels of Several Critical Shot Peen Process Variables on Workpiece Surface Integrity and the Resultant Effect on Workpiece Fatigue Life Behavior. Phase 2

Abstract

Abstract : The purpose of this program is to acquire a statistical database from which a mathematical model can be established to define the fatigue behavior of several materials that were prepared with various levels of shot peen process parameters. The objective of this model is to establish those shot peening process parameters that will produce optimum fatigue behavior in a variety of commonly used materials. During the program, fatigue performance data was collected from 1148 specimens made from 11 materials. Shot peening parameters included variations in shot intensity, shot media and size, Almen saturation, broken particle content, impact angel, and initial specimen surface condition. The fatigue performance data indicated that an optimum fatigue life could be obtained with variations in intensity. Typically, relatively low levels of shot peening intensity produced the longest fatigue life and increased peening coverage and intensity reduced the life; in some cases, dramatic decreases in life occurred with increases in coverage. Shot Peening, Fatigue life, Life improvement, Manufacturing and processing, Metallurgy.