Acoustic emission, electrical resistance, and surface optical techniques were used to monitor matrix cracking and fiber-breakage during fatigue in tension for [0/90]2s SiC-based laminate composite single-notch specimens. Acoustic emission sensors were positioned in several locations including on the edge of the specimen which enabled location of events through the width and the location of internal tunnel-type cracks. Surface optical techniques, including digital image correlation, enabled the extent of surface crack growth. From these two sets of data a simple circuit could be constructed of the different damaged and undamaged regions in the region of the notch that was in good agreement with the change in electrical resistance, thus establishing a correlation with change in ER and damage development. The unique placement of AE sensors on the edge of the specimen also enabled the capture and location of what are believed to be fiber failure events prior to ultimate failure.

对于[0/90] 2s SiC基层压复合材料单缺口试样，采用声发射，电阻和表面光学技术监测张力疲劳过程中的基体开裂和纤维断裂。声发射传感器被放置在几个位置上，包括在样品的边缘上，这使得事件的位置可以通过宽度和内部隧道型裂缝的位置来定位。表面光学技术（包括数字图像关联）使表面裂纹扩展到一定程度。根据这两组数据，可以在凹口区域中与电阻变化高度吻合的不同损坏和未损坏区域构建简单的电路，从而建立与ER变化和损坏发展的相关性。