RTM碳纤维复合材料宏观缺陷超声表征及分析

以RTM碳纤维复合材料为研究对象,通过超声特征扫描成像系统对大量试样进行检测,由理论可知,超声波的反射特性会随着宏观缺陷类型的不同而不同。首先从理论上分析各缺陷的反射特性,然后找出不同的宏观自然缺陷,归纳总结各种缺陷对应的图像特点,再采取破坏方法对试样进行切割、打磨,通过显微镜观察不同缺陷形貌特征。结果表明,超声特征扫描成像系统可以检测并分辨出不同的宏观缺陷,通过观察缺陷金相图可知不同类型缺陷形貌特征也各不相同,为RTM碳纤维复合材料宏观缺陷检测及形貌研究提供了一种可行方案。

ULTRASONIC CHARACTERIZATION AND ANALYSIS OF MACRO DEFECTS IN RTM CARBON FIBER COMPOSITES

The research object of this paper is RTM carbon fiber composite material.The ultrasonic characteristic scanning system is used to detect a large number of samples.Theoretically, the reflection characteristics of ultrasonic wave will vary with the type of macro defects.In this paper, the reflection characteristics of each defect are analyzed theoretically.Then, different macroscopic natural defects are found out, and the image characteristics of each defect are summarized.Then, the samples were cut into pieces and polished by destructive method, and the morphological characteristics of different defects were observed by microscope.The results show that the ultrasonic characteristic scanning system can detect and distinguish different macroscopic defects, and the morphological features of different types of defects are different by observing the metallographic diagram of defects, which provides a feasible method for the macroscopic defect detection and morphology study of RTM carbon fiber composite.