Investigating the influence of ZnO nanowires on the interfacial micro-mechanical behavior of carbon fiber/epoxy microdroplet structures using micro-Raman spectroscopy

摘要

The influence of ZnO nanowires on the interfacial micro-mechanical behavior of carbon fiber/epoxy microdroplet structures was studied using micro-Raman spectroscopy. Carbon fibers were modified by adding ZnO nanowires to the surface to improve interfacial bonding strength, using a hydrothermal method. The distributions of axial stress, shear stress, and stress transfer efficiency in the epoxy microdroplet were then measured. The results show that samples containing carbon fiber coated with ZnO nanowires had lower axial stress and larger interfacial shear stress than those with unmodified carbon fiber under the same strain. Specifically, under a 0.25 applied strain, carbon fiber coated with ZnO nanowires showed increased maximum values of shear stress from 6.21 to 22.80 MPa, with maximum values of stress transfer efficiency increasing from 1.07 to 6.88. Under increased strain, the stress transfer efficiency decreased due to the fracture of ZnO nanowires. Two possible types of ZnO nanowire fracture modes are discussed, and a model of microstress transfer is introduced.