Theory of vibration-damping polymeric coatings

Conclusions 1. An approximate method for calculating the characteristics of vibration-damping polymeric coatings of complex construction, based on equations of the theory of multilayer plates and shells, has been developed.2. The dimensionless parameters of the theory of multilayer plates and shells, g and h/r, are the basic quantities which determine the effectiveness of a damping coating.3. An increase in number of layers in the coating, while preserving the overall thickness of the packet and an assigned ratio between the thicknesses of the polymeric and rigid layers, exerts only a small effect on the effectiveness of the coating.Moscow Power Institute. Translated from Mekhanika Polimerov, No. 2, pp. 269–276, March–April, 1978.     

Some problems of the mechanics of polymeric composites

Work on the mechanics of polymer composite materials and structures carried out in the Moscow Power Engineering Institute during the last 5 years is reviewed. The review covers work on the theory of reinforced media and its application to composite sturctures, the theoretical and experimental investigation of the effect of technological factors on the reliability of composite structure, the theory of hardening viscoelastic media, and the mechanical testing of specimens and models of polymer composites.     

Calculation of the residual stresses and strains in wound reinforced-plastic products

A method is proposed for determining the residual stresses and strains in wound glass-reinforced plastic products. The fabrication process is divided into five stages: winding, heating polymerization, cooling, and removal from the mandrel. The initial stresses that develop during winding and the subsequent stress increment associated with heating are taken into account. Polymerization is treated as a process during which the mechanical and thermophysical properties of the material change. Chemical shrinkage of the resin and its filtration through the fiberglass are disregarded. Equations are derived for the residual radial and peripheral stresses in the finished product, for the residual change in inside diameter, and for the temperature at which the product is released from the mandrel during the cooling process. The experimental data relating to two types of wound products are discussed. The results of a computation of the residual stresses and the residual changes in inside diameter are compared with the experimental data.Moscow Power Engineering Institute. Translated from Mekhanika Polimerov, Vol. 5, No. 1, pp. 134–139, January–February, 1969.     

New aspects of applying the Dunham analysis

A new method of calculating the spectroscopic constants of diatomic molecules within the Dunham analysis frame, which yields more accurate results than earlier methods, is suggested here; it is based on interpolating the electronic energy function by the polynomial

     

Crystal Structures of N-[2-(4-oxo-4H-benzo[d] [1, 3]-oxazin-2-yl)benzamide and Propionamide and Their N-Containing Analog N-[2-(4-oxo-3,4-dihydroquinazolin-2-yl)phenyl]propionamide

Crystallography Reports - Specific features of the molecular and crystal structures of two substituted benzoxazinones (I and II) and their structural analog quinazolinone (III) have been analyzed...