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신병천(Byung-chun Shin),백진기(Jin-gi Beak),강흥식(Heung-sik Kang),백수현(Su-hyeun Baek),이장렬(Jang-yul, Lee) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
국토교통부 대형국가연구개발 실용화사업 추진의 일환으로 2006 년 12 월 시작한 “도시형자기부상열차 실용화 사업”의 시범노선이 2014 년 7 월 15 일 영업시운전을 개시하였다. 국내기술력과 자본으로 개발된 친환경, 최첨단의 새로운 교통수단이 인천국제공항에서 성공적인 영업운전 실적을 확보하게 되면 국내는 물론 해외시장 수출을 위한 기반이 마련된 중요한 의미가 있다. 비록 일본에 이어 세계 2 번째로 영업운전을 시작하였지만 구조물의 슬림화를 통하여 건설비의 경제성 및 경관성이 우수한 제품으로 1 등만을 기억하는 세계시장에서 우위를 차지할 수 있을 것이다. 차량을 포함한 도시형자기부상철도 시스템의 기술사업화를 위해서는 도시철도가 필요로 하는 요구조건을 만족하여야 한다. 현재 예비타당성 조사를 마치고 기종선정을 기다리고 있는 대전시에서의 사례를 통하여 도시 교통수단으로서 적합성 및 우수성을 고찰해 보고자 한다. The Urban maglev system has principal features as urban transportation. As a result of Urban Maglev Program sponsored by MOLIT, Urban-maglev will be opened soon at Incheon Airport Maglev line after test running for commissioning started on 15the of July in 2014. Even though Korean Urban maglev Project is the second opening line in terms of maglev commercializing after Japan, it can save the money for construction and can give good scenery to citizen. Daejeon selected this system last year and will start the construction. This paper shows major features of urban maglev system as urban transportation.
고장력 강판 부분용입 맞대기 용접부의 피로균열진전수명 평가
한승호,신병천,이웅,최전호,Han, Seung-Ho,Shin, Byung-Chun,Lee, Woong,Choi, Jeon-Ho 대한용접접합학회 2003 대한용접·접합학회지 Vol.21 No.1
Fatigue behaviour of partially penetrated butt-welded joints in high strength steel plates, in which crack-like structural defect, i.e. lack of penetration(LOP), is inevitably introduced during welding processes, was investigated. Fatigue lives of two types of welded joints, namely X-grooved and K-grooved joints, were experimentally determined first. Observed fatigue crack propagation behaviours of the partially penetrated butt-welds were interpreted through considering 3-dimensional semi-elliptical crack shape in front of the LOP. Based on such interpretation, a fracture mechanical method to estimate stress intensity factors at the crack tip was proposed. Since the fatigue lift of the partially penetrated butt-welds was strongly influenced by the ratio of size of the LOP to thickness, D/t, the D/t was used as a main parameter to calculate the fatigue lift by using the proposed method. Comparison of the fatigue lift obtained experimentally and analytically agreed well with each other. Hence it is suggested that the method used in this work to predict fatigue lift of the partially penetrated butt-welds can be applied to real cases with improved lift-prediction capability.
한승호,이탁기,신병천,Han, Seung-Ho,Lee, Tak-Kee,Shin, Byung-Chun 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.10
It is well known that the strength and the fatigue life of welded steel components are affected extensively by welding residual stresses distributed around their weldments under not only monotonic but also cyclic loads. The externally applied loads are to be superimposed with the welding residual stresses, so that unexpected deformations and failures of the components might occur. These residual stresses are not kept constant, but relaxed or redistributed during in service. Under monotonic loads the relaxation takes place when the sum of external and welding residual stress exceeds locally the yield stress of material used. By the way, it is shown that under cyclic loads the welding residual stress is considerably relieved by the first or the early cycles of loads, and then gradually relaxed with increasing loading cycles. Although many investigations in this field have been carried out, the phenomenon and mechanism of the stress relaxation are still not clear, and there are few comprehensive models to predict amount of relaxed welding residual stress. In this study, the characteristics of the welding residual stress relaxation under monotonic and cyclic loads were investigated, and a model to predict quantitatively amount of welding residual stress relaxation was proposed.
블완전용입 맞대기 용접재의 용입깊이에 따른 피로강도특성 및 잔류수명의 산출
한승호,한정우,신병천,Han, Seung Ho,Han, Jeong Woo,Shin, Byung Chun 한국강구조학회 1998 韓國鋼構造學會 論文集 Vol.10 No.3
본 연구에서는 기존의 강교에서 흔하게 발견되고 있는 맞대기 용접부의 용입불량으로 인한 부재의 피로강도 저하도를 정량적으로 평가하고자 하였다. 이를 위하여 강교량의 재료로 널리 사용되고 있는 SWS490강으로 제작된 완전용입 및 용입깊이가 서로 다른 불완전용입 맞대기 용접시험편을 대상으로 일정진폭하중시험을 수행하여 S-N선도를 산출하고 이를 비교 검토하였으며, 파괴역학적 방법을 이용하여 불완전용입 용접재의 피로수명을 계산하였다. 본 연구의 결과로서, 완전용입 용접재의 경우 AASHTO의 피로강도등급선도와의 비교에서 피로한도값은 A등급보다 높은 값을 보였고, S-N선도의 기울기는 5.57로 매우 높게 나타났다. 불완전용입 용접재의 경우 불완전용입깊이 D가 증가함에 따라 피로강도가 감소하는데, D=14.7mm인 경우 AASHTO의 E'등급보다 낮게 나타난다. 불완전용입 용접재의 파손거동에서 피로균열은 내부 용접루트 선단부에서 a/c가 매우 작은 반타원형 표면균열의 형태로 발생하고, 시험체의 두께방향으로 진전하여 최종파손을 유발한다. 파괴역학적 방법을 이용한 불완전용입 용접재의 피로수명을 평가하기 위하여 3차원 반타원형 균열형상에 대한 응력확대계수 K를 유한요소해석으로 구하였다. 여기서 얻어진 K값과 실험으로 얻어진 Paris식의 상수를 이용하여 불완전용입 용접재의 피로수명을 계산하여 비교하였다. 그리고 실제 불완전용입 맞대기용접부의 파손으로 붕괴사고가 발생한 성수대교의 수직재에 본 연구결과를 적용하여 피로수명을 계산해 보았다. In this paper fatigue strength reduction of butt weld with penetration defect, which can be seen frequently in the steel bridge, was assessed quantitatively. S-N curves were derived and investigated through the constant amplitude fatigue test of fully or partially penetrated welded specimen made of SWS490 steel. The fracture mechanical method was applied in order to calculate the remaining fatigue life of the partially penetrated butt welds. The fatigue limit of the fully penetrated butt welds was higher than that of category A in AASHTO's fatigue design curves, and the slope of S-N curves with 5.57 was stiffer than that of other result for welded part generally accepted as 3. The fatigue strength of the partially Penetrated butt weld was strongly influenced by the size of lack of penetration, D. It decreased drastically with increasing D from 3.9 to 14.7mm. Fracture behaviour of the partially penetrated butt weld is able to be explained obviously from the beach mark test that a semi-elliptical surface crack with small a/c ratio initiates at a internal weld root and propagates through the weld metal. To estimate the fatigue life of the partially penetrated butt weld with fracture mechanics, stress intensity factors K of 3-dimensional semi-elliptical crack were calculated by appling finite elements method and fracture mechanics parameters such as C and m were derived through the fatigue test of CT-specimen. As a result, the fatigue lives obtained by using the fracture mechanical method agreed well with the experimental results. The results were applied to Sung-Su bridge collapsed due to penetration defects in butt weld of vertical member.
점성변형 특성을 고려한 빙판의 충돌거동에 대한 수치해석
노인식(In-Sik Nho),신병천(Byung-Chun Shin) 한국해양공학회 1993 韓國海洋工學會誌 Vol.7 No.2
In the present paper, the overall state of the arts of ice mechanics which is the most typical research topic of the artic engineering field was studied. And also, ice loads generated by ice-structure interaction were estimated using numerical approach. The effects of viscous property of ice sheets to the ice load were investigated.<br/> The time dependent deformation behaviors of ice was modeled by visco-plastic problem using the finite element formalism. Constitutive model representing the material properties of ice was idealized by combined rheological model with Maxwell and Voigt models. Numerical calculations for the bending and crushing behavior of ice sheet which are the most typical interaction modes between ice sheets and structures were carried out. The time dependent viscous behaviors of ice sheets interaction forces acting on structures were analyzed and the results were studied in detail.
자기부상열차와 일반철도의 궤도주행 특성 차이에 따른 궤도선형관리 비교
백진기(Beak Jin-gi),신병천(Shin Byung-chun),김원중(Kim Won-jung),박도영(Park Doh-young) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
As Maglev system has different features to conventional rail system in propulsion and levitation, it demands dissimilar approach to control the track geometry. Consequently, the track geometry control of maglev system and measuring methods must comply with maglev vehicle's characteristics. This paper compares the maglev system and conventional wheel on rail system in terms of guiding vehicles. The differences presented in this paper can help to derive field measuring methods for maglev track and to accomplish running stability of maglev system.