The paper presents the results of investigations of the elastic properties of unconsolidated granular medium (GUM) when the structural phase transitions under the influence of external static effects appear. As a model of the media we used a system of metal balls with a diameter of 2 mm and 4 mm. We experimentally observed anomalous behavior of nonlinear elastic parameters under the influence of changing of external static pressure, which in turn causes structural phase transition in the system. The emergence of a structural phase transition in the sample was independently confirmed by measuring the electrical resistance of the system according to the external static force. The analysis of the results was based on the Hertz theory.
45.70.-n Granular systems
Department of Acoustics, Faculty of Physics, M.V.Lomonosov Moscow State University. Moscow 119991, Russia.
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