COMPARATIVE MICROMECHANICAL ANALYSIS OF NONELASTIC BEHAVIOR OF UNIDIRECTIONAL PLASTICS WITH TETRAGONAL AND HEXAGONAL STRUCTURES

摘要

A mathematical model allowing us to determine the effective elastic properties and describe the processes of inelastic deformation and damage accumulation of unidirectional fiber-reinforced composites with tetragonal and hexagonal structure is developed. A comparative analysis of the effective elastic moduli of glass, boron, organic, and carbon unidirectional plastics with hexagonal and tetragonal structure shows that, if the fiber volume fraction does not exceed 0.5, the effective elastic properties calculated by the models presented give close results. The calculation results of nonlinear fields of deformation and fracture are presented and the limiting strength surfaces of a fibrous glass plastic with hexagonal and tetragonal structure are plotted for different paths of transverse loading. The structure of the composite affects significantly the strength properties of the material.