A process model for shot peen forming

An equivalent loading unit that can produce a plastic layer was used to model the macroscopic forming effects of shot peening. Because a specific plastic coverage exists in which the individual peen impacts can be regarded as acting independently, their cumulative effects can be assumed to be distributed in the plastic layer as the result of a static load. The loading unit corresponds to the macroscopic stretching strain and can be conveniently calibrated from the peening parameters, such as shot radius, mass flow rate and air pressure. For more intensive peening, the number of loading cycles is in direct proportion to the peening time, which makes the model applicable to practical applications. Compared with experiments, this model gives a good prediction of the peen-formed deflection.