Research On Interface Mechanical Properties And Simulation Of High Modulus Carbon Fiber Resin Matrix Composites

Anti-embrittlement carbon fiber with higher modulus and dimension stability,is one of important material of space in the future,although the anti-embrittlement carbon fiber has many virtues,but relatively because of its surface is smooth,so the composite material consisting of interface performance is poorer,as an important component of the composite interface layer,and the mechanical properties of composite materials closely linked.The study of stress transfer,failure mode and ultimate strength of interfacial layer is an important direction,so it is necessary to establish the mechanical properties of interfacial layer and composite materials.The study of mechanical properties of interfacial layers is a mesoscopic field while the study of mechanical properties of composites is a macroscopic field,so the research process is a cross-scale field.Based on carbon fiber monofilament,interface layer and composed of a three-phase composite resin system as the research object,based on droplet debonding experiment,mesoscopic mechanics and fracture mechanics theory,cohesion theory and the method of numerical analysis of the three-phase system in under the action of external load,the stress transfer and damage process of interface layer on the theoretical analysis and numerical simulation.The research work is as follows: First based on the shear lag theory based carbon fiber monofilament stress transfer process of complex system theory analysis method,the analysis of fully considering the system load out may occur under the action of two kinds of damage model,the interface debonding damage fracture and matrix,and detailed analysis of the different damage mode,the interface shear stress under the system of distribution,followed by numerical analysis method of the interface layer was analyzed,The cohesive force element was used to determine the parameters of the interface layer in combination with the experimental process,and the fracture energy was obtained by establishing a mathematical model combined with experimental calculation.In summary,the theoretical and experimental analysis provided a reference for the study of interface mechanical properties of high-modulus carbon fiber composites.