модуль пружності

The main physical-mechanical and thermophysical characteristics of composite materials based on epoxy resin ED-20 and peroxide resin ED-20P (modified with tert-butyl hydroperoxide ED-20 of a molecular weight 480) in the ratio of 30 mass parts of ED-20P to 70 mass parts of ED-20 and unsaturated oligoester TGM-3 were researched. Butyl methacrylate was used as the active diluent of epoxy-oligoester mixtures. The polyethylene polyamine was used as hardener in a steochemical ratio. For the comparison we studied compositions which did not contain ED-20P resin.

An attempt was made to interpret the structural changes of glass in the temperature interval of glass transition based on the study of values ​​of the coefficient of linear thermal expansion (CTEL) of  Na2O-SiO2 and Na2O-CaO-SiO2 systems. In most cases, CTEL in this interval takes a leap of its value. However, for different glass compositions, the size of this leap is different, and in some cases it is not observed at all.

For the purpose of mathematical modeling of the process ofstressformation in glass, 6x25x100 mmfloat glasssampleswere tempered. During thetemperingthe change ofstresses and thetemperature ofinner and outer layers of glasswerefilmed witha digital camera.Obtainedresults almost completely coincided with the results obtained by R. Gardon.