### Back to Basics Shot Peening Calculations

Author:  Dr. David Kirk | Coventry University
Source:  The Shot Peener magazine, Vol 35, Issue 4, Fall 2021
Doc ID:  2021038
Year of Publication:  2021
Abstract:
INTRODUCTION The ability to quantify its variables has allowed shot peening to evolve into a smart technological process. Calculations are now an unavoidable part of shot peening. Every calculation has two components. The first is an equation and the second is data to substitute into the equation. As a trivial example, consider calculating payment for work done based on a fixed hourly rate. The equation is simply payment equals hourly rate multiplied by the time worked. At \$30 per hour, working for 10 hours would earn a payment of \$300. This simple example also highlights a very important feature of calculations. The units must balance! Every calculation involves a secondary equation. For this example hourly rate is \$30 divided by one hour so multiplying by hours cancels out the hour unit to leave, correctly, payment as only in dollars. This article collects together many of the large number of equations used in previous Shot Peener articles. The aim being to have them all available in one place. Some of the equations are simple, but some are complicated and were developed by the author. The properties of shot before it strikes a component are dealt with in Part 1 and the effects after striking a component are dealt with in Part 2.