equidistance, three-point bending, limiting states, normal, shear stresses, concentrated loads, controlling mechanical and geometric parameters.

Possible maximum permissible states of layered polymetallic rods of constant cross section under the influence of concentrated loads arbitrarily located in the span are studied. Three possible limiting states are considered: the first (extremely elastic), the second (pre-fracture state) and the third (fracture state). The conditions for their implementation are formulated, the corresponding levels of ultimate loads are determined, and ways to control the parameters of loading devices to ensure favorable deformation processes are outlined.

Yuri Vladimirovich Nemirovsky, Dr. Sci. Phys. & Math., Chief Researcher, Institute of Theoretical and Applied Mechanics S. A. Khristianovich SB RAS, Novosibirsk; Professor, Novosibirsk state technical University, Novosibirsk, Russia.