Experimental Analysis and Numerical Modelling of Interphase Interfaces of New Environmental Low-Energy Composites

Abstract

Suitable mechanical properties of composites are very important for light low energy constructions. Their specific properties can offer high specific strength, but current composite properties are not at maximum level, and therefore the efforts of development on further improving are focused. Properties of composites depend not only on character of a matrix and reinforcement, but also on properties of an Interphase between these components. Experimental and numerical analysis dealing with the mechanical properties at the micro level for new types of energy-efficient fiber composites with reduced environmental impact has been compiled. For numerical analyses a finite element method (FEM) was used. Analyses were focused on the cohesion and stress at the interface of the system fiber-matrix-core. From the results can be seen that the specific orientation of the reinforcement relative to the direction of applied force significantly affects the resulting elastic modulus. When investigating the delamination of the layers, the influence of the fiber orientation of the reinforcement is evident. Also quality of the interface has a crucial influence.