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The interaction of a solitary wave with an interface formed by two strongly nonlinear noncohesive granular lattices displays rich behavior, characterized by the breakdown of continuum equations of motion in the vicinity of the interface. By treating the solitary wave as a quasiparticle with an effective mass, we construct an intuitive (energy- and linear-momentum-conserving) discrete model to predict the amplitudes of the transmitted solitary waves generated when an incident solitary-wave front, parallel to the interface, moves from a denser to a lighter granular hexagonal lattice. Our findings are corroborated with simulations. We then successfully extend this model to oblique interfaces, where we find that the angle of refraction and reflection of a solitary wave follows, below a critical value, an analogue of Snell?s law in which the solitary-wave speed replaces the speed of sound, which is zero in the sonic vacuum.Fil: Tichler, A. M.. Universiteit Leide. Instituut-Lorentz for Theoretical Physics; Holanda; Shell Global Solutions International; Holanda;Fil: Gomez, Leopoldo Raimundo. Universidad Nacional del Sur; Consejo Nacional de Invest Cientifícas y Tecnicas. Centro Cientifico Tecnológico - CONICET - Bahia Blanca. Instituto de Fisica del Sur; Argentina;Fil: Upadhyaya, N.. Universiteit Leide. Instituut-Lorentz for Theoretical Physics; Holanda;Fil: Campman, X. Shell Global Solutions International; Holanda;Fil: Nesterenko, V. F.. University of California. Jacobs School of Engineering; Estados Unidos de América;Fil: Vitelli, V.. Universiteit Leide. Instituut-Lorentz for Theoretical Physics; Holanda

Transmission and Reflection of Strongly Nonlinear Solitary Waves at Granular Interfaces