مکانیک هوافضا (Apr 2024)
Numerical Investigation of the Effect of Shot Peening Parameters on the Residual Stresses Using a Random Three-dimensional Finite Element Model
Abstract
Shot peening is a cold working process that is used to increase the fatigue life of metal parts by creating compressive residual stress on their surface. The experimental investigation of the parameters of this process is very difficult and expensive, therefore, the finite element method is usually used to simulate and investigate the parameters of this process. However, most of the existing finite element models are not able to describe the real and random movement of the flow of particles and are also limited in terms of modeling the number of particles. Therefore, in this research, in the first stage, a finite element model of the shot pinning process is presented, which is capable of simulating the random and numerous states of this process, and in the next stage, the effect of different parameters of this process such as the size, velocity and angle of throwing the balls on the residual stress is investigated. the result of these investigations led to finding the optimal values of these parameters, so that the optimal value for the diameter of the shots was 1.5 mm, for the velocity of the shots was equal to 100 m/s and for the throwing angle of the shots was equal to 90 degrees. Also, the increase in the diameter of the shots had the greatest effect and the increase in the launch angle of the shots had the least effect in increasing the amount and depth of the residual stress. Also, we were able to numerically measure the important parameter " Shot peening intensity" which is usually measured experimentally by Almen gauge using this model. The obtained results were in good agreement with the experimental results obtained from the work of other researchers and therefore the validity of the presented model can be assured.
