Shot peening
（重定向自Shot peen）
![Hearst Mining building (stone, left) with expansion (shot peened aluminum alloy, right)](/Images/godic/202502/10/Hearst_memorial_mining_building2510.jpg")
![Grenaillage de surface fissurée](/Images/godic/202502/10/Grenaillage2510.JPG")
Shot peening is a cold working process used to produce a compressive residual stress layer and modify mechanical properties of metals and composites. It entails impacting a surface with shot (round metallic, glass, or ceramic particles) with force sufficient to create plastic deformation.