基于声发射技术的单丝复合材料界面性能研究

为了克服传统单丝断裂实验局限于透明及高应变树脂的缺点,进一步拓展其应用范围,将声发射技术与传统单丝断裂实验相结合以评估单丝复合材料界面性能.通过声发射技术监测了单丝复合材料的断裂过程,采用参数分析、波形分析以及聚类分析对单丝复合材料拉伸过程中的声发射信号特征进行研究,并与显微镜观察法测得的纤维断裂模式和界面剪切强度相对比。实验结果表明:声发射技术可以对单丝复合材料断裂过程中的断裂模式和界面性能进行高效评估,采用该方法分析得到的界面剪切强度与传统单丝断裂实验中的光弹花样观察分析结果一致。声发射技术可以拓展单丝断裂实验的研究对象,为单丝界面剪切强度的计算提供一种高效、通用的评价方法。

Study on interfacial properties of single fiber composites by acoustic emission

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.