AE Signals Characteristics from Fracture by Type of CFRP Stacking Structure

J. Ocean Eng. Technol. 2002;16(2):67-71.

CFRP 적층 형태에 따른 파괴시 음향방출 신호특성

남기우,문창권

부경대학교 재료공학부,부경대학교 재료공학부

Keywords: Acoustic Emission, Waveform, Power Spectrum, Carbon Fiber Reinforced Plastics, Fracture Mode, Fracture Behavior

핵심용어: 음향방출, 파형, 파워 스펙트럼, 탄소섬유강화복합재료, 파괴양식, 파괴거동

Abstract

Damage process of CFRP laminates was characterized by Acoustic Emission (AE). The main objective of this study is to determine if the sources of AE in CERP laminates could be identified from the characteristics of the waveform signals recorded during monotonic tensile test. The time history and power spectrum of each individual wave signal recorded during test were examined and classified according to their special characteristics. The wave from and frequency of AE signal from a specimens is an aid to the determination of the extent of the different fracture mechanism such as matrix crack, debonding, fiber pull-out and fiber fracture as load is increased. Four distinct types of signals were observed regardless of specimen condition. The result showed that the AE method could be effectively used for analysis of fracture mechanism in CFRP laminates.