Indent size really matters! It has a direct effect on both peening intensity and coverage. Peening intensity is directly proportional to the size of the indents. Coverage increases with indent size (other things being equal). The size of indents is, therefore, of primary importance. Control of indent size depends on knowing (a) the size, (b) the factors affecting size and (c) implementing methods of influencing indent size. Typical indents are illustrated in fig. 1. The shapes are approximately circular. One indent, highlighted at A, has had an 'equivalent circle' created at B whose diameter is d. Equivalent circles are generally assumed when modeling coverage and indent depth.
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