Interparticle contact behavior and wave propagation

The low-strain stiffness and energy dissipation in particulate materials is strongly determined by the behavior of contacts. This paper presents results of a test program designed to study the effect of contact response on the propagation of waves. Wave velocity and attenuation were measured during isotropic loading using a resonant column device at shear strains varying from γ= 10 −5 to γ= 10 −6 . Elastic, viscoplastic and brittle contact behaviors were studied with steel spheres, lead shot, and silica-kaolinite pellets. All measured velocity-stress exponents were b /2 >≈ 1/6, which is the theoretical value for spherical contacts. High-tolerance steel spheres approximated this value. Contact crushing showed the highest exponent. Theoretical analyses confirmed that several phenomena conduce to a velocity-stress exponent b /2 = 0.25: buckling of particle chains and increase in coordination number, elastoplastic behavior, and cone-plane contacts. Load and unload data for viscoplastic lead shot showed that c...

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