탄소섬유 복합재료의 AE 특성에 관한 연구

A Study on the AE Characteristics of the Carbon Fiber Composite Material

본 연구에서는 카본/에폭시 프리프렉으로부터 제작된 적층판을 사용하여 인장시험시 발생하는 AE특성과 파괴거동을 비교 검토하고 이들을 통하여 탄소섬유 복합재료의 파손특성과 AE법의 유용성을 규명하고자 한다.

This study was carried out to measure the mechanical properties and the acoustic emission (AE) characteristics of the carbon fiber reinforced composites of several types of the stacking sequence. AE signals were detected during the tensile tests. The number of ringdown counts, total ringdown counts were plotted together with the load-displacement curves. The tensile load-displacement behavior of specimen is compared and discussed based on the measured AE properties in relation to the failure mechanism. With the increase of load, AE signals increased. This showed that failure had being propagated by matrix deformation and cracking, delamination, fiber debonding and breakage. Felicity ratio has been obtained by observation of ;the Kaiser effect according to the variation of load ratio. The reloading tests showed that the felicity ratio decreased obviously when the load ratio or damage increased. These AE characteristics are hopeful to be employed as the criteria to evaluate the failure processes of composites.