Modeling of shot peen-forming operations using eigenstrains

Abstract eng:
Shot peen forming is a cold work process that consists in impacting a thin metallic part with small shots at high velocities so that the plastic deformations of the material close to the surface generates a significant distortion of the whole structure. In this work, we use the concept of eigenstrains (/stress-free deformations) to predict the result of conventional peen forming treatments when applied to large aluminium sheets. A set of validation experiments consisting in uniformly shot peened rectangular aluminium panels is presented and compared to simulations outcomes. The results are in qualitative agreement only but nevertheless represents progress in comparison with existing procedures.

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