Investigation of Plastic Strain Profile after Shot Peening by Finite Element Method

概要

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In peen forming, though the amount and depth of plastic strain near the surface introduced by shot impinging are key parameters affecting the deformation of the whole part, they are not well understood theoretically or even in the computer simulation. In this study, the computer simulation of shot impinging by the finite element method (FEM) is performed to obtain fundamental information on plastic strain introduced by shot peening. In the first step, the simulation of shot impinging with both the static implicit and dynamic explicit methods is conducted to verify the precision of the simulation. It is clarified that simulation by the static implicit method can provide sufficiently precise results for the simulation of shot impinging. As results of the simulation using a single shot, it is found that the diameter of the plastic strain area in the material is about two fold larger than that of shot indent on the surface. Also, the simulation using multiple shots shows that the distance of each shot affects the each plastic strain profile at 0.75 R or less (R is the shot radius).
The Japan Society for Technology of Plasticityの論文