2003 年 2003 巻 48 号 p. 31-38
Simplified theoretical formulae based on shot peening parameters and materials properties have been developed to predict the maximum of the compressive residual stress produced by shot peening for hardened steel. These formulae are based on the motion equation for a shot and the analytical model proposed by Li et al., who utilized Hertz theory of elastic contact and a simplified elasto-plastic theory. Two cases which deformation of shots was elastic or elasto-plastic at impact were treated. Experimental verifications were carried out under various shot peening conditions for a carburized specimen. Shots were made of cast steel (HV800, HV590 and HV450), fused zirconia and glass, each having three levels in diameter. Actual residual stress distributions were measured by X-ray diffraction method. The predicted maximum of the compressive residual stress by the proposed formulae agreed well with the experimental values in wide variety of shot peening conditions.