Analysis of oblique rebound using a redefinition of the coefficient of tangential restitution coefficient

• Impact is described considering friction and tangential restitution acting independently.
• The coefficient of tangential restitution is redefined.
• Stick and sliding regimes of impact are described.
• A unique set of restitution and friction coefficients describes both impact regimes.
• The model can justify anomalous experimental results in literature.

A redefinition of the coefficient of tangential restitution based on the separation of friction and restitution effects is presented. Using this modified coefficient of tangential restitution and the usual definitions of the coefficients of normal restitution and sliding friction, a description of oblique impacts in both stick and slip regimes is obtained. This, description, which is tested with available rebound data in literature, avoids sharp (apparent) variations in the coefficient tangential restitution with impact angle and can justify anomalous results reported by Calsamiglia et al. (1999).

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