The shot-peening process can be demonstrated with a ball-peen hammer (in which one of the heads is..

The
shot-peening process can be demonstrated with a ball-peen hammer (in which one
of the heads is round). Using such a hammer, make numerous indentations on the
surface ofa piece of aluminum sheet (a) 2 mm and (b) 10 mm thick, respectively,
placed on a hard flat surface such as an anvil. Note that both pieces develop
curvatures, but one becomes concave and the other convex. Describe your
observations and explain why this happens.

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