Analysis and determination for the parameters of “cohesive element” in the numerical model of single fiber composites: the elastic parameters

Abstract

In the fiber-reinforced resin matrix composites, the “interphase” is an important component. And the “cohesive element” is usually used to characterize the mechanical properties of “interphase” in numerical models based on the general finite element software ABAQUS. But the corresponding parameters of it are difficult to be determined. So the single-carbon fiber-reinforced resin matrix composites are used as the main research object and the method combining resistance experiment and numerical analysis is adopted. Then in the numerical models of three different single-carbon fiber composites (CCF/epoxy128, CCF/epoxy5228, CCF/Bismaleimide5428), the parameters of the “cohesive element” are analyzed and determined. It turned out that in CCF/Bismaleimide5428, the parameters are much higher (they are 10–12 GPa). It is also demonstrated that the ability of transferring load of “interphase” is much stronger in it than the other single fiber composites. What’s more, these parameters will be used for the numerical analysis of macroscopic mechanical properties of composites in future.