MODELING OF FIBER WHISKERIZATION IMPACT ON THE RESIDUAL STRESS-STRAIN STATE OF LAYERED COMPOSITES

摘要

A methodology for determining residual stresses and strains in flat polymer composite panels reinforced by nanomodified whiskered fibers is suggested. In order to calculate the effective properties of the whiskered monolayer, an approach based on the model of multilayered cylindrical inclusion is used. The properties of the interfacial whiskered area are determined by the model of elliptical inclusions with chaotic orientation. The residual stresses in the panels are determined by a classical thermoelasticity model for layered composites. As an example, we consider a problem of residual stresses and strains in a carbon fiber-reinforced plastic panel reinforced by whiskered fibers with carbon nanotubes grown on its surfaces. The computations conducted show a practical possibility for eliminating the residual stress and strain in the material with different variants of reinforcement. It is also shown that the model suggested can be used to predict different whiskerization parameters that allow reducing anisotropy of the thermal expansion coefficients in composites.