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동적 광탄성실험에 의한 응력이완 노치부근에서의 접촉특이응력 해석 (2)
이억섭,황시원,나경찬,Lee, Eok-Seop,Hwang, Si-Won,Nah, Gyeong-Chan 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.7
The dynamic photoelastic technique had been utilized to investigate the possibillity of relieving the large local singular stresses induced at the corner of a right- angle- indenter. The indenter compressed a semi-infinite body dynamically with an impact load applied on the top of the indenter. The effects of the geometric changes of the indenter in terms of the diameter (d) and the location (1) of the stress relieving notch on the behavior of the dynamic contact stresses were investigated. The influence of stress relieving notches positioned along the edge of the semi-infinite body on the dynamic contact stresses were also studied by changing the diameter (D) and the location (L) of the notch. A multi-speak-high speed camera with twelve sparks were used to take photographs of full field dynamic isochromatic fringe patterns. The contact singular stresses were found to be released significantly by the stress relief notches both along the indenter and the edge of the semi-infinite body. The optimal position and geometry of the stress relieving notches were obtained with the aid of limited experimental results.
SHPB 기법을 이용한 A16061-T6의 고속 인장 변형거동 규명
이억섭,김관희,황시원,Lee, Eok-Seop,Kim, Gwan-Hui,Hwang, Si-Won 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.12
Mechanical properties of the materials used for transportations and industrial machinery under high stain rate loading conditions have been required to provide appropriate safety assessment to these mechanical structures. The Split Hopkinson Pressure Bar(SHPB) technique with a special experimental apparatus can be used to obtain the material properties under high strain rate loading condition. There have been many studies on the material behavior under high strain rate compressive loading compared to those under tensile loading. In this paper, mechanical properties of the aluminum alloy, Al6061-T6, under high strain rate tensile loading were determined using SHPB technique.
이억섭,윤해룡,황시원,Lee, Eok-Seop,Yun, Hae-Ryong,Hwang, Si-Won 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.11
The dynamic photoelasticity with the aid of Cranz-Shardin type high speed camera system is utilized to record the dynamically propagating behavior of an interface crack. This paper investigates determined the effects of the hole (exited on the path of the crack propagation) on the crack propagation behavior by comparing the experiment isochromatic fringes to the theoretical stress fields.
SHPB 기법을 사용한 고변형률 속도 하중하에서의 합성수지의 동적 변형 거동
이종원(Jong Won Lee),이억섭(Ouk Sub Lee),황시원(Si Won Hwang),김성현(S Hyun Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
It is well known that a specific experimental method such as the Split Hopkinson Pressure Bar (SHPB) technique is the simplest experimental technique to determine the dynamic material properties under the impact compressive loading conditions with strain-rate of the order of 10³/s~10⁴/s. This type of experimental procedure has been widely used with proper modification on the test setups to determine the varying dynamic response of materials for the dynamic boundary conditions such as tensile and fracture as well. In this paper, dynamic compressive deformation behaviors of an Ethylene Copolymer materials widely used for the isolation of vibration from varying structures under dynamic loading are estimated using the SHPB technique.
비개착 구조물 압입 시 선단부 붕락 방지를 위한 전면가압판 개발 및 적용성 연구
김형규(Hyeong Gyu Kim),황시원(Won Hwang),이유경(Yoo Kyung Lee),박소현(So Hyeon Park) 한국철도학회 2017 한국철도학회 학술발표대회논문집 Vol.2017 No.05
최근 신도시, 택지개발 증가로 철도 및 고속도로의 교통시설로써의 기능을 저해하지 않고 하부를 횡단하는 입체교차화 공사가 널리 적용되고 있지만 비개착 시공 중 토질조사 미비, 지중 매설물 누락, 지하수 유출 등으로 인한 지반함몰 및 붕락사고가 빈번히 발생하고 있다. 따라서 본 연구에서는 외부에서 제작한 구조물을 압입 및 굴착하는 비개착 공법인 Front Jacking 공법을 선정, 시공시 선단부 굴착면의 붕락을 방지하고 운행선의 침하를 억제하는 전면 가압판을 개발하여 현장 적용한 후, 피드백을 통하여 시공성을 확보 할 수 있는 전면 가압판의 최적 설계안을 도출하였다. With the increasing demand of housing site development in recent years, underpass interchange construction has widely been applied beneath the railway and highway without interfering with their function as a traffic facility. However, ground subsidence and ground collapse are often observed during the application of nonopen cut method due to many factors such as insufficient soil investigations, lack of consideration of underground structures, and ground water leakage. To cater for these problems, this study includes the application of Front Jacking method that is another type of non-open cut method in which a pre-cast structure is inserted in the ground and excavation is carried out inside it. A pressure device was developed and applied in the field in order to avoid face collapse and to prevent subsidence underneath the traffic facilities. Finally, the feedback from field application was used to optimize the design of pressure device for ensuring better workability.
이건봉(Gun Bong Lee),박종헌(Jong Hun Park),유웅선(Ung Sun You),황치호(Chi Ho Hwang),김윤환(Yoon Hwan Kim),황시원(Si Won Hwang) 한국철도학회 2012 한국철도학회 학술발표대회논문집 Vol.2012 No.10
본 논문에서는 열차운행이 열차와 궤도 사이의 상대적인 이동인 점을 착안하여 열차의 위치를 고정하고, 열차의 위치와 속도에 따라 궤도를 이동시키는 시뮬레이터를 개발하였다. 본 시뮬레이터는 위치가 고정된 열차, 위치와 속도조절이 가능한 무한궤도, 역구간을 지정하는 RF비콘, 열차의 위치를 검지하기 위한 레이저 센서 및 타코미터 센서로 구성되어 있다. 대상노선에 대하여 위치에 따른 역, 시설, 제한속도 등을 데이터로 입력하면, 노선 전체에 대한 열차운행을 물리적으로 시뮬레이션 할 수 있다. 본 시뮬레이터는 노선 전체를 대상으로 하는 열차제어와 정보제공, 교육시스템 등에 기여할 것이다. In this paper, a train service fixed the location of the train with relative movement between the train and the service. And then the simulator, which makes the rails move with the location and speed of the train, is invented. This simulator is composed of a stationary train, a caterpillar which can control speed, a RF beacon which specifies the section, and a laser and tachometer sensor for location of train. Entering data of a station, a facility, and a speed limit about the route into the database, the train service for the entire route can be simulated physically. This simulator will contribute to develop the train control, the information, and the education systems.