Back to Basics: Coverage
Author: Prof. Dr. David Kirk, Coventry University, U.K.
Source: The Shot Peener magazine, Vol 35, Issue 3, Summer 2021
Doc ID: 2021028
Year of Publication: 2021
Abstract:
INTRODUCTION
Coverage and peening intensity are the two major properties
for peened components that have to be both measured and
controlled. As with all definitions “The Devil is in the Detail.â€
SAE’s J2277 does not help clarity of understanding and is
somewhat misleading as the following extract indicates:
“Coverage is defined as the percentage of a surface that has
been impacted by the peening media. The minimum peening
time required to obtain 100% coverage is determined by
gradually increasing total peening time until the entire surface
being peened exhibits overlapping dimpling. Coverages above
100% are multiples of the exposure time required to achieve
100% coverage.†Only the first sentence is accurate!
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