This study examined the change in acoustic emission as a function of measurement position of fiber-reinforced composites. Single-edge-notched carbon fiber/epoxy composites were prepared and tested under cyclic loading, with sensors located at specific distances from the end of the notch. Although the Ib-value increased overall, the degree of increase significantly varied with position and acoustic emission frequency. Notably, the proportion of acoustic emission signals for each failure mode varied due to a high attenuation rate at high frequencies, which increased the Ib-value. Accordingly, the high-frequency fiber-failure signals significantly affected the Ib-value. This study focused on the importance of analyzing acoustic emission signals by considering the crack location and frequency-dependent attenuation rate. We concluded that an acoustic emission sensor should be located 20–40 mm from the crack location for woven carbon fiber/epoxy composites.

这项研究检查了声发射的变化与纤维增强复合材料测量位置的关系。制备了单边缘缺口碳纤维/环氧树脂复合材料，并在循环载荷下进行了测试，传感器位于距缺口末端特定距离处。尽管I b值总体上增加，但是增加程度随位置和声发射频率而显着变化。明显地，由于在高频下的高衰减率，每个故障模式的声发射信号的比例变化，这增加了I b值。因此，高频光纤故障信号严重影响了I b-值。这项研究集中在通过考虑裂纹位置和频率相关的衰减率来分析声发射信号的重要性。我们得出的结论是，对于碳纤维编织物/环氧树脂复合材料，声发射传感器应位于距裂缝位置20–40 mm处。