Mechanism of creation of compressive residual stress by shot peening

Assessment of surface hardening effects from shot peening on a Ni-based alloy using electron backscatter diffraction techniques

“…S a describes the surface area roughness, as opposed to R a , which measures only one particular profile. The equation used to calculate S a is given below as Equation 1 [21]: [1] where M is the number of columns in the surface and N is the number of rows in the surface, with x, y and z the co-ordinates of each data point.…”

“…Shot peening is a process whereby many hard particles (typically steel or glass beads), known as 'shot', are directed towards the intended surface. The impact indentations of the shot induce local plastic deformation at the surface, increasing the dislocation population to impede potential crack growth, and inducing a compressive residual stress field as a result of the recovery of underlying material [1][2][3].…”

Experimental Investigation of Shot Peening on Case Hardened SS2506 Gear Steel

“…Kobayashi et al [12] did some original investigations on shot peening by dropping large bearing balls onto steel plates and measuring the residual stresses in the plate surface. They compared the results with static indentations by loads that created the same indentation diameter as the drop tests did.…”

Nondestructive residual strain measurement using high energy x-ray diffraction

“…This approach needs either a functional or numerical model for the strain depth profile of shot peened material. There are already some simple functional and more complicated numerical forms that describe strain depth profiles (56)(57)(58)(59)(60)(61)(62)(63)(64)(65)(66)(67)(68)(69). The problem with the functional forms is that they do not seem to be accurate enough to explain the intensity depth profiles we are getting from shot peened aluminum.…”