Abstract
A problem on behavior of loose medium in a rotary drum is solved with taking into account the dilatancy and internal friction of material, as well as the elastic and prelimiting plastic strains. It is shown that when the drum rotation angle increases, material may be deformed in two modes. Under the first mode, prelimiting state is reached at the material and drum interface, and the material displaces as a rigid whole. Under the second mode, prelimiting state is reached near the free surface of the material, and a flow sets on in the upper layer, which leads to mixing. The fields of displacements and stresses are constructed, and the regions of active loading and elastic unload are determined.
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