When damage in carbon fibre reinforced composites (CFRP) is monitored by acoustic emission (AE), it is a common belief that high frequency AE events originate from fibre failure. This shows that this statement may not correspond to the reality, and matrix cracks can emit high frequency AE signals. Quasi-static tension of [−45₂/0₂/+45₂/90₂]_s laminates was monitored by AE, Digital Image Correlation (DIC) on the surface of the sample and in-situ optical microscopy on the sample’s polished edge. Unsupervised k-means clustering algorithm was applied to the AE results. By comparison with the direct DIC and microscopic observations, the AE cluster with high frequency and low amplitude was found to correspond to directly observed matrix cracks.

当通过声发射（AE）监测碳纤维增强复合材料（CFRP）的损坏时，通常认为高频AE事件源自纤维失效。这表明该陈述可能与实际情况不符，并且矩阵裂缝会发出高频AE信号。的[-45准静态张力₂ /0 ₂ / + 45 ₂ /90 ₂ ]_小号通过AE，样品表面的数字图像关联（DIC）和样品抛光边缘的原位光学显微镜对层压板进行监控。将无监督k均值聚类算法应用于AE结果。通过与直接DIC和显微镜观察相比较，发现具有高频率和低振幅的AE簇对应于直接观察到的基体裂纹。