Some experiments on anelastic rebound

Abstract

Measurements of the coefficient of restitution and the time of contact of steel balls impinging on blocks of mild steel have been made. It is found that measurements of the coefficient of restitution clearly show the onset of yield, while the time of contact continues to have the values predicted by the Hertz treatment for elastic deformations at velocities of impact as much as eight times that required first to initiate plastic yield. The effect of surface finish is found to be very important in rebound measurements on metals; and measurements of the time of contact are shown to be a useful method of measuring; the viscoelastic properties of glass like polymers. © 1964.