叶片铣削及喷丸加工残余应力测试与三维表征

The residual stress is one of the important characterizations of the shot peening effect. In order to study the distribution of residual stresses after milling and shot peening of blade with typical thin-walled structural characteristics, the three-dimensional residual stresses of the titanium alloy blade are tested with X-ray diffraction method with the specific structural characteristics of the blade as the object of study. The residual stresses on the blade back and the blade basin surface are the compressive residual stresses, and there is no consistent pattern of distribution, but the distribution trend of the residual stresses on the blade back and the blade basin along the depth direction is generally consistent; finally, according to the basis of the surface and the subsurface residual stress of the blade, the empirical formula for predicting the residual stresses based on the three-dimensional coordinates of the leaf (x-y-h) distribution was obtained with the numerical fitting method. The residual stress of the specific points validates the feasibility of the empirical formula for the three-dimensional characterization of residual stress in shot peening.