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엔지니어링 플라스틱 소재의 피로특성에 대한 응용프로그램 개발
장천수(Cheon-Soo JANG),박범규(Bum-Gyu PARK),김철수(Chul-Su KIM),김정규(Jung-Kyu KIM) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
In this study, in order to perform more efficiently reliability design and integrity assessment of structural members, the relational database management program on the engineering plastics was constructed. This program contained 476 grades for 14 kinds of the engineering plastics and was developed using MS-access and MS-visualbasic. This program consists of 3 modules; search condition, probabilistic characteristics of material property, evaluation of P-S-N curve. We perform fatigue test for probabilistic durability analysis and this results input the database program to estimate P-S-N.
장천수(Cheon-Soo Jang),박범규(Bum-Gyu Park),김철수(Chul-Su Kim),김정규(Jung-Kyu Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Engineering plastics have applied to mechanical components and structures due to a sufficient mechanical, thermal characteristics and impact-absorptive properties. In order to assure the safety of mechanical components included engineering plastics such as the polyacetal, it is important to estimate the probabilistic strain-life (P-ε-N) curve considering the variation of fatigue characteristics. The fatigue strain controlled tests were conducted under constant 50% humidity and 23℃ condition by a universal testing machine at strain ratio, R=0. In this study, a practical procedure is introduced to determine and evaluate P-ε-N curves. The variation of fatigue properties in the polyacetal was found to be normal distribution using χ² and K-S test, when the probability distributions of a fatigue life were examined by a strain-life method.
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.
장국진(Kook-Jin Jang),김철수(Chul-Su Kim),장천수(Cheon-Soo Chang),장승호(Seung-Ho Jang),김정규(Jung-Kyu Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
To reduce the cost and the time of transport in Eurasian railroad networks such as TKR, TCR and TSR owing to the problem of different track gauges (narrow/standard/broad gauge), it is important to develop the gauge - adjustable wheel set system to adapt easily to these gauges. Moreover, This system accomplish a conversion operation periodically from the gauge variable segment between Various gauge. gauge variable pressure coil spring from conversion process accomplish a central role repetitively for operation mechanism between flange and locking part. Therefore, to assure the safety of the gauge-adjustment wheelset system, it is necessary to fatigue life evaluate of coil spring in the system using stress analysis. it was performed to evaluate stability of running track with UIC 510-4code. Fatigue life of the gauge - adjustable compression spring with the variation of the fatigue strength was evaluated by fatigue life analysis simulator