GENERALIZED PROBLEM AND CONCEPT OF THRESHOLD THEORY VARIETY AND HYBRID CORN
At the present stage of development of modern threshing and separating devices for corn the problem of macro-and micro-damages of grain is not solved. This is due to the low level of theoretical study of processes and phenomena occurring in the external and internal tissues of corn grain under the influence of mechanical influences. Corn grain to cover with a strong shell with an average thickness of 0,3 mm, capable of a small area to bend under the influence of blows from the working parts of threshing and separating devices to a depth of 0,45 mm without the appearance of residual deformations. The material of the shell can be considered isotropic and viscoelastic, and the process of its deformation is described by elements of the theory of thin-walled shells, presented as Maxwell's viscoelastic medium, which is under the influence of wave oscillations caused by the impact of hitting’s on the pins of threshing and separating devices. A more complete understanding of flow processes in the shell of the grain of corn under the mechanical action absolutely pins can be obtained by combining the theory of thin shells, the contact problem of the elasticity theory of Hertz, the main provisions of the theory of impact and by integrating the result of the enterprises in the information environment of biomechanics and biosymmetry. In this case, it becomes clear how the tensions are distributed in the contact area of the grain with the pine, what is the mutual influence of materials and forms of contacting body’s regularities of formation of the contact area, as well, as how these phenomena are interconnected in time. Besides, it is possible to functionally express regularities of influence of internal tissues of grain on process of compensation of deformation of its shell.