Shot peening parameters optimization based on residual stress-induced deformation of large fan blades

Deformation of fan blades after shot peening is investigated. A finite element analysis (FEA) model of deformation induced by compressive residual stress (CRS) reveals that the difference in CRS between blade back and blade basin is the main cause of deformation. An FEA model of the influence of shot peening parameters on residual stress shows that to minimize deformation, the parameters should be optimized to give a CRS in the blade back −80 MPa to −50 MPa greater than that in the blade basin. An experimental study shows that the optimized parameters greatly reduce blade deformation caused by shot peening. [Display omitted] •The finite element model for deformation caused by residual stress and the model of shot peening are established.•The residual stress difference between blade back and blade basin caused the fan blade deformation.•The shot peening parameters are optimized to reduce deformation and verified by experiments.