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등가구조응력법을 이용한 철도차량 용접대차프레임의 피로해석
김철수(Chul-Su Kim),안승호(Seung-Ho Ahn),정광우(Kwang-Woo Chung),전영석(Young Suk Cheon),박춘수(Choon-Soo Park),김상수(Sangsu Kim),장천수(Cheon-Su Jang) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
Fatigue design and evaluation of welded joints are typically carried out by weld classification approach in which a family (theoretically infinite) of parallel nominal stress based S-N curves are used according to joint types and loading modes as well as extrapolation-based hot spot stress. Traditional finite element methods are not capable of consistently capturing the stress concentration effects on fatigue behavior due to their mesh-sensitivity in stress determination at welds resulted from notch stress singularity. The extrapolated hot spot stresses tend vary, depending on the element sizes, types, joint types, and loading mode. however, the equilibrium-equivalent structural stress method(E2S2) has been recently developed through several joint industry projects as a robust method to analyze welded components using finite element analysis. This method has been proven effective in correlating a large amount of published fatigue test results in the literature such as master S-N curve and has used for evaluating the fatigue life of welding components. In this study, fatigue analysis of the welding bogie frame is examined using E2S2 method with master S-N curve.
김철수(Chul-Su Kim),안승호(Seung-Ho Ahn),정광우(Kwang-Woo Chung),전영석(Young-Suk Cheon),박춘수(Choon-Soo Park),김상수(Sang-Su Kim) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
A vibration fatigue analysis yields a more accurate evaluation of the durability life since it considers excitations that occur in the structure up to its natural frequency. However, vibration fatigue analysis of welding bogie frames of the rolling stocks are not yet taken into account in the norm EN.13749(requirements of the bogie frame). Therefore, in order to assure the safety of the rolling stocks, it is important to examined the vibration fatigue analysis of that under actual load histories. In this study, under load histories obtained from dynamic analysis results, static and vibration fatigue analysis of the welding bogie frame are performed by using durability software. Moreover, these results are compared with the fatigue life of the frame under the loading in the norm EN fatigue test condition.
김철수(Kim Chul-Su),강주석(Kang Ju-Seok),안승호(Ahn Seung-Ho),정광우(Jung Kwang-Woo),전영석(Cheon Young Suk),박춘수(Park Choon-Soo),김재홍(Kim Jae-Hong) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
As a consequence of the standardization process developing in Europe, on April 2005 the new European standard EN 13749 was issued by the European standardization body CEN. The norm EN 13749 standardizes and develops the requirements already present in UIC leaflets for test verifications and define all technical requirements for the acceptance process in order to achieve a complete satisfactory design of the bogie. The aim of the norm is to define the complete design process of new railway bogies. It includes design procedures, assessment methods, verification and manufacturing quality requirements. In this study, fatigue analysis of the bogie frame is investigated comparing different approaches between conventional methodology and simulation results based on the VPD(Virtual Product Development).
김철수(Chul-Su Kim),강주석(Ju-Seok Kang),안승호(Seung-Ho Ahn),정광우(Kwang-Woo Chung),전영석(Young Suk Cheon),박춘수(Choon-Soo Park),김상수 한국철도학회 2009 한국철도학회 세미나자료 Vol.2009 No.5
Recently, the design process for a railway bogie frame in Europe has been carried out according to the norm EN 13749. The activities in the norm EN shall demonstrate that the design of the bogie frame fulfills the acceptances of 4 steps of the program such as structural calculation, static tests, fatigue test and on-tracks tests. At the end of the acceptance program, the on-tracks tests have the aim to measure the real stress history generated in operation and to verify that they are reasonably next to those calculated and measured on the test rig. Therefore, in order to assure the safety of the railway vehicle, it is important to examined the durability of that under load histories measured from on-tracks tests. In this study, under variable amplitude loading based on the actual acceleration history, fatigue analysis of the welding bogie frame is investigated by using durability software. Moreover, the fatigue life of the frame under the loading in the norm EN fatigue test condition is evaluated and compared with the life under variable amplitude loading.