MODELING OF EFFECTIVE ELASTIC CHARACTERISTICS AND ANISOTROPY PARAMETERS OF ANTIFRICTION POLYMERIC COMPOSITES REINFORCED BY ORIENTED FIBERS

Multicomponent tribocomposites based on epoxy binder ED-20 reinforced with fibers of E-glass and polytetrafluoroethylene are considered. It is assumed that glass fibers are oriented along the x and y axes of the rectangular coordinate system, while polytetrafluoroethylene fibers are oriented only in the direction of the x axis. This corresponds to the reinforcement of the material with glass fabric, in which polytetrafluoroethylene fibers are woven. A model has been constructed that makes it possible to perform numerical calculations of the values of effective elastic characteristics (components of the tensor of effective elastic moduli) and elastic anisotropy parameters of the specified antifriction composites. The model is based on the generalized singular approximation of the random field’s theory, which is used in solving the stochastic differential equation for the equilibrium of an elastic medium. Numerical calculations of the effective elastic characteristics and elastic anisotropy parameters in the directions of the x, y, and z axes of the rectangular coordinate system of antifriction polymer composites are carried out, taking into account changes in the volume concentrations of their components. When calculating the values of effective elastic characteristics of model tribocomposites, the self-consistency method was used. Studies have shown that an increase in the content of polytetrafluoroethylene fibers leads to a decrease in the values of effective moduli of elasticity and an increase in anisotropy (especially in the direction of the x and y axes of a rectangular coordinate system) of model antifriction composites. It has been established that at fixed concentrations of the epoxy binder and polytetrafluoroethylene fibers, the redistribution (in the directions of the x and y axes) of the volume fraction of E-glass fibers for some components of the tensor of effective elastic moduli leads to an increase in their values, and for others, on the contrary, to a decrease. In this case, the anisotropy increases in the direction of the x axis and weakens in the direction of the y axis, while the values of the anisotropy parameter in the direction of the z axis change insignificantly.

modeling, antifriction polymeric composite, inclusion, matrix, effective elastic moduli, anisotropy