A Study on the Processing of Anti-Corrosive Composites for Propeller Shaft of the Ship and the Evaluation of Its Static and Fatigue Properties

J. Ocean Eng. Technol. 1998;12(1):23-31.

선박용 프로펠러축 방식처리용 복합재료의 제조와 그 정적 및 피로특성 평가에 관한 연구

김윤해,왕지석,배창원

한국해양대 이공대,한국해양대 이공대,한국해양대

Keywords: FRE Coating, Kind 1 Propeller Shaft, Linear Notch Mechanics, Notch Root Radius, Epoxy Resin, Fatigue, Anti-Corrosive Composite

핵심용어: 섬유강화플라스틱 코팅, 제1종프로펠러축, 선형노치역학, 노치저반경, 에폭시 수지, 피로, 방식용 복합재료

Abstract

Kind 1 propeller shaft in ships is the shaft which is provided with effective measures against corrosion by sea water, or the shaft which is made of approved corrosion resistance materials. The propeller shaft other than specified above is Kind 2. Thus, this study is mainly concerned with the resistance to fatigue damage in sea water against stress concentrations due to the notches. The results obtained can be summarized as follows; (1) The stress increases with curing time, however, when the curing time reaches at 96 hours the stress becomes a constant value. The elongation decreases with curing time, however, when the curing time reaches at 48 hours the elongation becomes a constant value. Thus, in case of FRP coating on propeller shaft, it is necessary to cure for 48 hours at least. (2) The relation of $sigma$$_n$-K$_t$ is to be classified into two parts, which is a part where fracture nominal stress, $sigma$$_n$, decreases with increasing $K_t$, and a part where $sigma$$_n$ is nearly constant independent of $K_t$. (3) According to a linear notch mechanics, the measure of severity controlling the fracture in notched FRP body is the notch root radius, $ ho$. The notched static strength of an arbitrary specimen will be estimated from $sigma$$_{max}$ -1/$ ho$ curve. (4) Through the observation of cross section after fatigue test, the part of interface was kept good condition irrespective of loading conditions.