An investigation was made of the loss of stability of polymer rods exposed to disturbances in the form of camber of the rod and eccentricity of load application. At present, polymeric materials are being used not only as fencing constructions and as constructions of 'secondary' value but also as bearing elements. Polymer rods for the strengthening of suspended constructions are an example. These rods undergo both elongation and compression.

Abstract. The problem of optimization for thick-walled shell, experiencing temperature and power feedback. Under the influence of temperature field the properties of material of an object can change. That allows to manage the deflected mode of such objects while achieving a certain law of radial change of physical and mechanical parameters. A centrally symmetric problem of elasticity theory is studied. As a result we received a law of variation of Young's modulus, in which a spherical dome is equally stressed according to the simplified theory of Mohr. The problem was reduced to a Bernoulli differential equation. This equation was solved numerically using Runge-Kutta method of fourth order.

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A procedure for determining the relaxation constants of material that enter the Maxwell–Gurevich non-linear equation was examined. For recycled polyvinyl chloride, relaxation curves plotted at different temperatures were processed, and the influence of temperature on the relaxation parameters was investigated. For each parameter, an empirical formula was selected to describe its temperature dependence.

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