In this work, we presented the results of the experimental study of standing shear waves in the rectangular parallelepiped shaped resonator made of rubber-like polymer material fixed between two wooden rigid plates. Metal bars were attached to one plate to fix the load mass and create an additional static shear stress in the medium due to the gravity. This tension leaded to a change of elastic characteristics of studied medium which was expressed in the increase of the resonant frequency under stress.
$^1$Department of Acoustics, Faculty of Physics, M.V.Lomonosov Moscow State University
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