Crack-like and pulse-like dynamic frictional sliding
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Numerical and experimental investigation of frictional sliding under dynamic loading conditions is discussed. The configuration analyzed consists of two plates of Homalite (an elastic birefringent polymer material) connected along a planar interface. The plates are characterized as isotropic elastic materials and the interface is characterized by a rate- and state-dependent frictional law that also accounts for dependence on normal stress variations. The calculations are carried out within a framework where two constitutive relations are used: a volumetric constitutive relation between stress and strain and a surface constitutive relation that characterizes the frictional behavior of an interface. The propagation speeds of the sliding tip are found to be of the order of the longitudinal wave speed. Frictional sliding is found to occur in modes that involve uniform sliding behind the rupture front, an isolated slip pulse, multiple slip pulses or a combination of these modes. The dependence of the sliding mode on the initial compressive stress, the impact velocity and the friction parameters is described. Numerical results compare favorably with experimental observations in terms of intersonic sliding tip speed, crack-like and pulse-like sliding modes and the stress fields at the sliding tip.