Coverage Variability

Author:  Dr. David Kirk, Coventry University
Source:  The Shot Peener magazine, Vol 31, Issue 1, Winter 2017
Doc ID:  2017005
Year of Publication:  2017
Abstract:  
INTRODUCTION Coverage is one of the most important parameters in shot peening. It is specified in J2277 to be the “Percentage of a surface that has been impacted at least once by the peening media.” It is, however, impossible to avoid coverage variability. Measured coverage values vary because we cannot apply peening uniformly and also because the measurement technique itself is a variable. The topic is so important that it merits different approaches. Coverage variability was the subject of a previous article (TSP, Summer, 2009) using a largely mathematical approach. This article is much more descriptive, avoiding mathematical derivations.