The Reality of Shot Peen Coverage

Author:  D. Lombardo, P. Bailey, Gen Elec Aircraft Engines,
Source:  The Shot Peener magazine, Vol 13 / Issue 4, Winter 1999
Doc ID:  1999099
Year of Publication:  1999
Abstract:  
Reprinted with permission from Proceedings of ICSP6. ABSTRACT The statistical nature of surface coverage during shot peening is often misunderstood. In some instances, process and design engineers will specify "200% coverage" or more without a clear definition of what is meant by percent coverage or how to achieve it. This paper will attempt to clarify important aspects of the surface coverage process. A combination of analytical, experimental, and numerical results are presented to illustrate the difference between (1) area of strike ratio, (2) coverage ratio and (3) percent coverage. In addition, a computer program is presented that allows the user to experiment with peening process parameters and observe the effects of the same.