基于声发射技术的单丝复合材料界面性能研究

In order to overcome the limitation of traditional single fiber fracture experiment on transparent and high-strain resin and further expand its application scope, acoustic emission technology were combined with traditional single fiber fracture experiment to evaluate the interface performance of single fiber composite materials. Fracture process of single fiber composite was monitored by acoustic emission technology. Parameter analysis, waveform analysis, and cluster analysis were used to study the signal characteristics of acoustic emission during the tensile test of the single fiber composite, which were compared with the fiber fracture pattern and interfacial shear strength observed by microscope. Results show that acoustic emission technology could be used to evaluate fracture pattern and interfacial property during the single fiber fracture test effectively. Inter-facial shear strength calculated by acoustic emission was consistent with that calculated with the aid of microscope in traditional single fiber fracture experiment. It suggests that acoustic emission technology can extend the scope of single fiber fracture experiment subject, and can serve as a general and effective way for interfacial shear strength calculation.