Characteristics of Elastics Waves of Fiber-Reinforced Plastic with Localized Heat Damage

J. Ocean Eng. Technol. 2002;16(4):48-53.

국부 열손상을 받은 복합재료의 탄성파특성

남기우,김영운

부경대학교 재료공학부,한국해양수산연수원

Keywords: Carbon Fiber Reinforced Plastic, CFRP, Glass Fiber Reinforced Plastic, GFRP, Fracture Mode, Acoustic Emission, Time-Frequency Analysis Method, Nondestructive Technique

핵심용어: 탄소섬유강화 플라스틱, 유리섬유강화 플라스틱, 파괴모드, 음향방출, 시간-주파수 분석법, 비파괴기법

Abstract

Fiber-reinforced composites are extensively used in electronic, ship and aerospace applications due to their high strength and high toughess. In these applications, they are often subjected to localized heat damage due to various sources. In order to ensure their reliability, it is important to predict their residual properties using nondestructive evaluation thchniques. Fabric fiber composite specimens were manufactured with six layers of the glass-fiber prepreg and the carbon-fiber prepreg, respectively. The specimens were subjected to a localized heat damage using a heated copper tip with a diameter of 10mm at 35$0^{circ}C$(CFRP) and 30$0^{circ}C$(GFRP), respectively. The specimens were then subjected to tension tests while acoustic emission (AE) activities of specimens were collected. The AE activity of all specimens showed three types of distinct frequency regions. Those are matrix cracking, failure of the fiber/matrix interface and fiber breakage.