Jung, Do yun Lee, B.-S. Yu, W.-R. Na, Won jin 2024-01-19T13:32:31Z 2024-01-19T13:32:31Z 2021-09-02 2021-11 1475-9217 https://pubs.kist.re.kr/handle/201004/116245 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. ？ The Author(s) 2021. English SAGE Publications Effect of propagation distance on acoustic emission of carbon fiber/epoxy composites Article 10.1177/1475921720986156 1 Structural Health Monitoring, v.20, no.6, pp.3342 - 3353 Structural Health Monitoring 20 6 3342 3353 N scie scopus 000677313500001 2-s2.0-85100091822 Engineering, Multidisciplinary Instruments & Instrumentation Engineering Instruments & Instrumentation Article REINFORCED-CONCRETE POLYMER COMPOSITES FRACTURE PROCESS CLUSTER-ANALYSIS FIBER BEHAVIOR SIGNALS MECHANISMS CFRP Acoustic emission composite materials Ib-value analysis