Satisfactory Peening Intensity Curves

Author:  Prof Dr David Kirk, Coventry University, U.K.
Source:  The Shot Peener magazine, Vol 26 / Issue 4, Fall 2012
Doc ID:  2012033
Year of Publication:  2012
ACADEMIC STUDY: INTRODUCTION Obtaining satisfactory peening intensity curves is a basic priority. Such curves will: 1 Allow acceptable derivation of the peening intensity, 2 Help in determining the time required to achieve specified coverage levels and 3 Indicate the stability of the arc height measurements as a function of time. Achieving these objectives is assisted by knowing the factors that constitute a satisfactory peening intensity curve. The first objective is very well-documented but the other two are often either overlooked or ignored. As an extreme example consider the situation shown in fig.1. This would be universally classed as being an unsatisfactory peening intensity curve. The data set indicated is not impossible. It could have involved a “pre-bow” of 25μm for a measured unpeened strip together with four strips peened using a rapidly-falling airblast pressure.

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