Reaction of 2,4-disubstituted 1,3-dioxolanes with dihalocarbenes

The insertion of dihalocarbenes into the C₍₂₎-H bond of cis- and trans-2-alkyl-4-propyl-1,3-dioxolanes leads to mixtures of stereoisomers.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1030–1031, August, 1991.     

Investigation of the mechanical properties and internal stress field of directionally reinforced materials in transverse tension

The dependence of the transverse Young's modulus and Poisson's ration on the reinforcement ratio, type of structure, and internal fiber radius has been investigated. The microstress field in the structure of a composite in transverse tension is analyzed. Simple approximate expressions, which can be used to determine the corresponding mechanical characteristics without analyzing the state of stress, are obtained from the exact equations. A medium reinforced with doubly periodic groups is taken as a model. The exact solutions of the problem are obtained by means of elliptic functions.Institute of Mechanics, Academy of Sciences of the Ukrainian SSR, Kiev. Translated from Mekhanika Polimerov, No. 5, pp. 812–817, September–October, 1970.     

Mechanical properties and internal shear stress field in reinforced media as a function of the type of microstructure

The effect of type of microstructure and volume content of filler and binder on the internal stress field and shear modulus has been analyzed for various composite materials. There is an "optimum" filler content at which the maximum stresses in the structure are lowest. A quantitative estimate is obtained for the error of the approximate formulas for the shear modulus of various types of structure.Mekhanika Polimerov, Vol. 3, No. 4, pp. 667–670, 1967