Investigation of surface induced-residual stresses due to shot peening using needle probes technique

Y a Tene Deffo (1) , P Tsafack (1) , Benjamin Ducharne (2)

1 University of Buéa
2 LGEF - Laboratoire de Génie Electrique et Ferroélectricité

Hammer peening is an important surface work hardening process widely used in industries for fatigue retardation of mechanical parts. The constructive effect extent of hammer peening process on material properties and the residual stresses inherited from the processing history of the component, however, are dimmed by the degree of favorable compressive residual stresses or dislocation density introduced in the material. Investigating the extent to which hammer peening process may result in positive compressive residual stresses via experimental evidence will be the purpose of the present study. The magnetic signature of a ferromagnetic steel is highly dependent on the residual stress distribution. This observation constitutes the fundament of several micro-magnetic non-destructive testing methods. In this study, the micro-magnetic needle probe characterization method is used to sensor the local magnetic property variations due to the hammer peening process. Then, a magneto-mechanical model of the subject material due to shot peening surface induced-residual stresses is introduced based on the Jiles-Atherton-Sablik (JAS) model. This study worth as a validation of the needle probe method as a simple way to check the conformity of the hammer peening treatment. Coupled to simulation results, residual stress estimations can also be provided.

Mots clés: Magneto-mechanical effects; Magnetic sensors; Nondestructive testing; Stress

Domaines: Sciences de l'ingénieur [physics]; Matériaux

Y a Tene Deffo, P Tsafack, Benjamin Ducharne. Investigation of surface induced-residual stresses due to shot peening using needle probes technique. COMPUMAG 2019, Jul 2019, PARIS, France. ⟨hal-02154715⟩