Prediction of modal properties of circular disc with pre-stressed fields

One of the technique of the disc modifications to achieve the required dynamic properties is to initiate pre-stress in disc plane. This is concerned primarily with “tuning” of dynamical properties of vibrating circular discs by technological treatments inducing the residual in-plane stresses. It is possible to obtain the disc in-plane stress either roll-tensioning of disc surface or volume transformation of disc part. In the roll-tensioning process, the disc is compressed within a certain annular contact zone between two opposing rollers. The contact zone of circular disc is plastically deformed and the residual stresses occur in whole disc plane. The effects of residual stresses induced by roll-tensioning on dynamical properties (natural frequencies, mode shapes) are analysed.