title: Anomalous behavior of the coefficient of normal restitution in oblique impact.
abstract: The coefficient of normal restitution in an oblique impact is theoretically studied. Using a two-dimensional lattice model for an elastic disk and an elastic wall, we demonstrate that the coefficient of normal restitution can exceed unity and has a peak against the incident angle in our simulation. We also explain this behavior based upon a phenomenological theory.
authors.affiliation: Graduate School of Human and Environmental Studies, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan. kuninaka@kuchem.kyoto-u.ac.jp
authors.forename: Hiroto
authors.initials: H
authors.lastname: Kuninaka
authors.forename: Hisao
authors.initials: H
authors.lastname: Hayakawa