Vibration damping capability of electrical discharge machined surfaces: Characteristics, mechanism and application

This research explored frictional energy dissipation aspects of electrical discharge machined (EDM) surfaces in the context of passive vibration damping. The effect of discharge current and duration was investigated to characterise the damping capability of these surfaces, and to understand the underlying mechanisms. Topographic analyses indicated the damping ratio to be maximised through an interaction between positive skewness and elevated kurtosis of surface height, which facilitates recurrent microslip and plastic deformation at asperity contact edges. This renders EDM textures to be uniquely disposed to vibration control, as demonstrated by their efficacy in enhancing the dynamic performance of a grooving tool. [Display omitted] •Spark eroded surfaces are uniquely disposed to passive vibration damping.•This is facilitated by the positive skewness and elevated kurtosis of EDM surfaces.•Energy is dissipated by microslip and plastic deformation at asperity contacts.