레일 체결장치 텐션클램프의 거동

최신형(Choi Shin-Hyeong),박범호(Park, Beom-Ho),윤경민(Yun, Kyung-Min),배현웅(Bae, Hyun-Ung),임남형(Lim, Nam-Hyoung) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.12

콘크리트 궤도 건설의 증가로 인한 레일 체결장치의 중요성이 커지고 있는 상황에서 최근 레일 체결장치의 부속품인 텐션클램프가 절손되는 사고가 발생되었다. 이는 현장상태, 운영기관, 열차운행조건 및 빈도 등 다양한 요인에 의한 것으로 텐션클램프의 거동관련 연구가 필요하다. 본 논문에서는 실내실험 및 유한요소해석을 통해 텐션클램프의 역학적 거동을 분 석하였다. 실내실험을 수행하여 텐션클램프 체결력에 따른 응력 및 변위를 도출하고 이를 유한요소해석 결과와의 비교를 통해 해석 모델을 검증하였다. 또한 검증된 모델을 적용하여 열차 하중에 따른 텐션클램프의 변형과 응력을 도출하고, 응력 분석을 통해 텐션클램프의 피로에 대한 취약도를 파악하였다. In a situation in which importance of rail fastening system is growing with increasing the construction of concrete track, an accident of tension clamp(the component of rail fastening system) breaking has been recently occurred. This results from various factors such as field condition, operating agency, running condition, traffic frequency and so on. Thus, the study for the behavior of tension clamp is required. In this paper, an experiment and finite element analysis(FEA) have been performed to analyse the mechanical behavior of tension clamp. The stress and displacement of tension clamp have been analyzed as the clamping force through a laboratory test, and they were compared with FEA results. Furthermore, the stress and displacement of the tension clamp are derived from train load condition applying the verified model, and the fatigue vulnerability of the tension clamp is identified through stress analysis.

콘크리트 궤도용 탄성레일체결장치 손상취약부 분석

최정열,김상진,정지승 국제문화기술진흥원 2022 The Journal of the Convergence on Culture Technolo Vol.8 No.3

본 연구는 콘크리트 궤도용 탄성레일체결장치(System 300-1)의 손상취약부에 관한 실험 및 해석적 연구이다. 콘크리트 궤도에서 탄성레일체결장치는 열차주행 시 레일과 침목을 결속하는 핵심 궤도구성품이다. 레일체결장치 구 성품 중 방진패드와 텐션 클램프(Tension Clamp)는 압축력과 부상력에 대응하며 상시 변형이 발생되는 피로부재이 다. 본 연구에서는 동일구간의 운행선에서 6년, 11년, 16년 동안 사용된 탄성레일체결장치를 채취하여 사용년수에 따 른 텐션 클램프의 잔류변형 특성을 분석하였다. 또한 수치해석을 바탕으로 주요 구성품별 거동메커니즘을 분석하고 손상취약부를 도출하였다. 본 연구에서 수행한 수치해석을 통해 체결력 도입부터 외력 작용에 따른 텐션 클램프 각부 의 응력(변형율)을 분석하여 텐션 클램프의 손상취약부를 도출하였다. The purpose of this study is to derive the damage weak part of the elastic rail fastening system for concrete tracks (System 300-1). In the concrete tracks, the elastic rail fastening system sticks the rail and the sleeper and reacts all the time when the train is running. Among the components of the rail fastening system, the resilience pad and tension clamp were fatigue members and were constantly deformed in response to compressive and uplift forces. In this study, the residual deformation characteristics of the tension clamp according to the period of use were analyzed using by specimens taken on site in the same section for 6, 11, and 16 years on the serviced urban transit. In addition, the damage mechanisms for each component were derived based on finite element analysis. As a result of the numerical analysis, the stress (strain) of each part of the tension clamp according to the external force from the applied clamping force was analyzed to derive the damaged weak part of the tension clamp.

체결구의 텐션클램프 거동에 관한 연구

배석복(Seok Bok. Bae),최신형(Sin Hyung Choi),손병직(Byung Jik Son),임남형(Nam Hyoung Lim) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.11

레일 체결스프링은 레일 저부에서 레일과 침목 사이를 탄성적으로 고정시키는 가장 중요한 궤도 부품 중 하나이다. 궤도에서 발생하는 횡압은 체결 스프링에 생기는 압축응력이 인장 응력으로 변환되는 등 텐션 클램프 내 응력에 큰 영향을 미치며 응력의 크기는 초기체결력과 매우 밀접한 관계가 있다. 본 연구에서는 콘크리트 침목에서 사용되는 탄성 레일 체결장치의 초기체결 시 응력거동을 유한요소해석과 실험을 통하여 비교·분석하였다. A rail fastening spring is one of the most important part for fixing elastically between the sleeper and the rail of the rail bottom. Lateral stress occurred to tracks influences closely on changing compressive stress to tension stress and amount of stress is closely related to initial clamping force in tension clamp. In this study, Stress behavior is analyzed throughout the experiment and FE analysis when the initial clamping of elastic fastening used for concrete sleeper.

Tension-free Vaginal Tape Obturator 수술시 Babcock 겸자를 이용한 테이프 장력조절이 술 후 배뇨형태와 환자의 만족도에 미치는 영향

배재현,이정구,조대연,장훈아,오미미 대한배뇨장애요실금학회 2007 International Neurourology Journal Vol.11 No.2

중 변형률속도 영역에서 차체 강판의 인장/압축 경화 거동에 관한 연구

주근수(Guensu Joo),최민국(Min Kuk Choi),허훈(Hoon Huh) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5

The tension/compression hardening behavior is important in sheet metal forming processes because of complicated loading paths. Experimental methods to measure the tension/ compression behavior have not considered the effect of the strain rate although the strain rate is related to the hardening behavior of sheet metal. The tension/compression tests need to be conducted considering the strain rate to acquire accurate hardening behavior. This paper deals with an experimental technique to measure the tension/compression behavior of sheet metal at strain rates from 0.001 s<SUP>-1</SUP> to 50 s<SUP>-1</SUP> for real sheet metal forming. A new clamping device was developed to prevent a sheet specimen from buckling under compression loading condition. Jig systems to impose pre-strain and reverse loading were also developed for high speed material testing machine. Tension/compression tests have been conducted at various strain rates for SPCC and DP590 with pre-strain of 10%. Hardening behavior under the tension or compression loading condition was compared to each other at severe strain rates.

변형를 속도에 따른 인장/압축 경화 거동의 근사를 위한 수정 Two-surface 모델

배기현(G. H. Bae),허훈(H. Huh) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5

This paper suggests a modified two-surface model to describe the tension/compression hardening curves of auto-body steel sheets with the variation of the strain rate. Tension/compression tests of auto-body steel sheets were carried out by utilizing the simple clamping device developed by Bae et al. [~] in order to obtain tension/compression hardening curves. To consider the strain rate effect on the hardening behavior, a gap function used for the two-surface model was modified by inserting the strain rate hardening term. The approximation results show that the modified two-surface model can accurately describe the tension/compression hardening behavior with the variation of the strain rate.

초기 변형률 및 변형률 속도에 따른 차체 강판의 인장/압축 실험

배기현(G. H. Bae),허훈(H. Hun) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10

This paper proposes an experimental method to investigate the tension/compression hardening behavior of auto-body steel sheets considering the pre-strain and the strain rate. To conduct tension/compression experiments with respect to the pre-strain and the strain rate, an experimental method was established by using a newly developed clamping device for the specimen to prevent buckling. From experiments, the tension/compression hardening behavior is observed with the variation of the pre-strain and the strain rate. The measured hardening behavior can be utilized for the reliable simulation of the sheet metal forming process and the accurate prediction of the spring-back.

Failure Analysis of Fatigue Cracking in the Tension Clamp of a Rail Fastening System

Yeun Chul Park,안창범,심형보,김만철,홍종국 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.5

Fatigue cracking was recently discovered in the tension clamp (SKL15) of a rail fastening system during its service life. Here, the fatigue strengths of SKL15 and SKLB15 (used for replacement) tension clamps were assessed using fi eld measurements and fi nite element analyses. The strain and displacement of these tension clamps were measured both in a laboratory and at the section of railway track where the original fatigue cracking occurred. Due to limited access to the exact crack initiation location, the strain gauge was instead installed nearby. Finite element analysis was conducted to obtain the stress conditions at the crack initiation location. Extremely high stresses were produced after the installation of tension clamps SKL15 and SKLB15, and this allowed small stress amplitudes for fatigue cracking. The fatigue strengths of the clamps were evaluated using Goodman and Gerber curves. The stress amplitude of the SKL15 was greater than the allowable stress amplitude, presenting the possibility of fatigue cracking.

SI기법을 이용한 장력추정기법의 실험적 검증

박대효(Park Taehyo),장한택(Jang Han-Teak),김병화(Kim Byeong Hwa) 한국구조물진단유지관리학회 2007 한국구조물진단학회 학술발표회논문집 Vol.11 No.1

본 논문은 시스템 인식 기법을 이용한 현수교 행어의 장력 추정 방법에 대한 실험적 검증을 소개한다. 이론적 연구의 검증을 위하여, 실험실 모형 행어 케이블에 대한 동적 특성치 추출이 수행되었고, 추출된 고유진동수와 모드 형상을 이용하여 모형 행어 케이블의 장력 측정이 수행되었다. 여기서, 추정된 장력은 수치모델과 계측모델의 동적 특성치들이 동일할 때 수치모델의 케이블 장력을 인식함으로서 추정되었다. 알고 있는 도입 장력과 추정된 장력을 비교함으로서, 제안된 장력의 정확도가 검증되었다. This paper introduces the experimental verification of a frequency-based SI tension estimation method for a double hanger system on a suspension bridge. For the earlier theoretical work, a set of modal tests has been conducted to estimate cable tension force using a set of the measured natural frequencies and mode shapes of hanger cables. The tensile force on a double hanger cable system has been estimated by directly identifying a numerical model whose dynamic characteristics are the same with those of the measured one. By comparing the results with known tension, the system identification technique proposed earlier paper has been verified.

SI기법을 이용한 장력추정기법의 실험적 검증

박대효 ( Park Taehyo ),장한택 ( Jang Han-teak ),김병화 ( Kim Byeong Hwa ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.1

This paper introduces the experimental verification of a frequency-based SI tension estimation method for a double hanger system on a suspension bridge. For the earlier theoretical work, a set of modal tests has been conducted to estimate cable tension force using a set of the measured natural frequencies and mode shapes of hanger cables. The tensile force on a double hanger cable system has been estimated by directly identifying a numerical model whose dynamic characteristics are the same with those of the measured one. By comparing the results with known tension, the system identification technique proposed earlier paper has been verified.