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T형 편면용접이음재의 응력해석과 굽힘피로강도에 관한 연구
강성원(S. W. Kang),이태훈(T. H. Lee),전재목(J. M. Choun),김충희(C. H. Kim) 한국해양공학회 1999 한국해양공학회지 Vol.13 No.2
In this study, one side fillet welded T-joint, used in box type girder and other welding structure was investigated by stress analysis and bending fatigue test without edge preparation, with variation of joint shape.<br/> The purpose of this study is to give the welding condition and design standard on manufacturing one side fillet welded T-joint.<br/> As a result, the following conclusions were obtained.<br/> 1) In one side fillet welded T-joint, the larger the leg length and the penetration depth, the greater the bending fatigue strength because reduction of stress and strain on toe and root. The increase of the longitudinal leg length rather than vertical leg length contributed to the increase in bending fatigue strength.<br/> 2) In one side fillet welded T-joint without edge preparation, both general manual welding and general automatic welding were carried out with same condition. In this case, automatic welding showed deeper penetration and more increased longitudinal leg length than manual welding, so that automatic welding offers greater bending fatigue strength.<br/> 3) For one side fillet welded T-joint without edge preparation with automatic welding, the ratio(h/t) of the leg length(h) and the main plate thickness(t) in which toe crack can occur was 1.0 over.
익단 분출이 있는 날개표면의 압력분포에 관한 실험 연구
이봉준,김충희,張景鎭,신동진 한국 항공대학교 항공산업기술연구소 1997 航空宇宙産業技術硏究所 硏究誌 Vol.7 No.-
중국의 남경항공항천대학에 있는 시험부 3m x 2.5m의 저속 풍동을 이용하여 직사각형 반날개의 끝에 원형 익단분출관을 장착하여 압축공기를 분출할 때 날개표면의 압력분포에 대한 실험연구를 하였다. 원형 분출관은 날개 끝에 시위방향으로 장착된 동관으로서 측면에 분출공이 설치되어 있다. 본 연구에서는 분출각도, 분출운동량계수, 분출공의 위치 등을 변화시키면서 날개끝에서 압축공기를 분출할 때와 분출하지 않았을 때의 날개표면의 압력분포 특성을 조사하였다. 실험결과 날개끝에서 분출을 할 경우에 날개끝부분에서 압력분포에 영향을 미치고 스팬방향으로 공기력의 증가를 가져오는 효과가 있음을 알 수 있다. An experimental study was conducted in the NH-2 subsonic wind tunnel (test section 3m x 2.5m) located at Nanjing University of Aeronautics and Astronautics, China, to determine surface pressure over rectangular semi span wing with tip blowing using circular blowing tube. The circular blowing tube was made of a copper tube with multiple blowing holes and was installed at the wing tip along chordwise. In this study, the data were measured for the wing with and without wing tip blowing. Selected data at several test condition varying blowing angle. jet momentum coefficient and blowing holes location are discussed to show pressure distribution trends. The test results showed that the wing tip blowing mainly affected the pressure distribution of the outboard region of the wing and increased the spanwise loading near the tip.