The similarity of peening benefit depends on the similarity of the peening media - other things being equal. Ceramic and glass beads CAN have very similar properties in terms of density and shape. This would lead to a prediction of very similar peening benefits. As-cut steel wire, on the other hand, has a very different shape from that of cast steel shot so that close similarity of a property such as fatigue life would not be expected. Spherical-conditioned cut steel wire has a similar shape to that of cast steel shot and hence one would predict similar peening benefits.
