基于声发射技术的T700碳纤维/树脂基体界面性能评估

Evaluation of Interfacial Performance of T700 Carbon Fiber/Resin Matrix by Acoustic Emission

目的 采用声发射技术,对东丽T700碳纤维和2款树脂基体的界面性能进行评估。方法 通过多组单丝拉伸试验,获取T700碳纤维Weibull形状参数m和尺度参数σ0。使用单纤维断裂方法,利用声发射技术进行监测,选择声发射信号的幅值和能量作为特征,对T700碳纤维和透明的E51环氧树脂及不透明的聚苯硫醚树脂的单纤维断点数量分别进行评估,并与显微镜观察的数量进行对比。结果 获取了T700碳纤维与2种树脂的单纤维断裂声发射信号特征数值。通过声发射监测和显微镜观察法,测量得T700碳纤维与E51环氧树脂的界面剪切强度分别为44.03、46.47 MPa,偏差在5.5%左右。通过声发射技术,测量得T700碳纤维与聚苯硫醚树脂的界面剪切强度达33.43 MPa。结论 使用声发射技术能够准确监测碳纤维/树脂界面中单纤维的断裂信号,为评价纤维和不透明树脂的界面性能提供了有效方法。

The work aims to evaluate the interfacial performance of TORAY T700 carbon fiber and two kinds of resin ma-trixes by acoustic emission(AE).The Weibull shape parameter m and scale parameters0 of T700 carbon fiber were obtained through multiple single-filament tests.The number of fragment in T700 carbon fiber,transparent E51 epoxy resin and opaque polyphenylene sulfide resin was evaluated by the single fiber fracture test method with AE signal amplitude and energy as char-acteristics through AE monitoring and then compared with that observed by microscope.Single fiber fracture AE signal charac-teristics of T700 carbon fiber and two kinds of resins were obtained.The interfacial shear strength of T700 carbon fiber and E51 epoxy resin obtained by AE monitoring and microscope observation method was 44.03 MPa and 46.47 MPa respectively,with a deviation of about 5.5%.The interfacial shear strength of T700 carbon fiber and polyphenylene sulfide resin measured by AE was 33.43 MPa.AE can accurately monitor the fracture signal of single fiber in the carbon fiber/resin interface,which provides an effective method for evaluating the interfacial performance of fiber and opaque resin.