프로펠러 날개의 피로강도에 관한 연구
A Study on the Fatigue Strength of Propeller Blades
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초록
Recently, to reduce the noise and vibration levels of ships, high skewed marine propellers with thinner thickness are adopted widely,however, such propeller design trend causes to reduce the strength of blades. Propeller blades are rotating continuously in irregular wake field of ships. So, it is necessary to examine the strength of them precisely including from a viewpoint of fatigue strength. In present paper, the fatigue strength of propeller blades was investigated. Firstly, fatigue tests for Al Bronze, the representative propeller material, were carried out. The S-N curve was obtained for the assessment of the fatigue crack initiation life. And the material properties C, m for the fatigue crack propagation analysis based on the Paris' equation were derived. For the 2nd stage, the structural responses of propeller blades in irregular ship wake field was carried out using the finite element analysis code. And the fatigue strength of propeller blades were considered based on the calculated stress levels and material characteristics for fatigue strength.
Abstract
Recently, to reduce the noise and vibration levels of ships, high skewed marine propellers with thinner thickness are adopted widely,however, such propeller design trend causes to reduce the strength of blades. Propeller blades are rotating continuously in irregular wake field of ships. So, it is necessary to examine the strength of them precisely including from a viewpoint of fatigue strength. In present paper, the fatigue strength of propeller blades was investigated. Firstly, fatigue tests for Al Bronze, the representative propeller material, were carried out. The S-N curve was obtained for the assessment of the fatigue crack initiation life. And the material properties C, m for the fatigue crack propagation analysis based on the Paris' equation were derived. For the 2nd stage, the structural responses of propeller blades in irregular ship wake field was carried out using the finite element analysis code. And the fatigue strength of propeller blades were considered based on the calculated stress levels and material characteristics for fatigue strength.
참고문헌 (7)
- ASTM E 647, "ASTM E 647, Standard test method for measurement of fatigue crack growth rates", Annual book of ASTM standard, ~ (1988)
- ASTM E 466, "ASTM E 466,, Standard practice for conducting constant amplitude axial fatigue tests of metallic materials", Annual book of ASTM standard, ~ (1988)
- Anderson, T.L, "Fracture Mechanics -Fundamentals and Application" (1991), CRC Press Inc
- Lee, C.-S, "Analysis of the Structural Failure of Marine Propeller Blades", Journal of Ship and Ocean Technology, 6(3), pp.37~45 (2002)
- Nho, I.S, "A Fimite Element Dynamic Analysis of Marine Propeller Blades", Proceeding of PRADS'89 (1989)
- 노인식, "프로펠러 날개의 동적 구조해석 시스템 개발", 대한조선학회 논문집, 41(2), pp.114~120 (2004), 대한조선학회
- 송인행, "강도를 고려한 고스큐 프로펠러 날개의 형상 설계", 대한조선학회 논문집, 45(4), pp.411~416 (2008), 대한조선학회