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구병춘(Byeongchoon Goo),김재훈(Jaehoon Kim),양승용(Sungyong Yang),서정원(Jungwon Seo),정홍채(Hungchai Jung) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
First of all, experimental study on the fatigue behavior of SM 490 A was carried out on double V-grooved butt welded plates such as reinforcement removed, as-welded and weld toe ground. In addition, welded plates with transverse fillet welded web, load carrying cruciform fillet welded plates, non-load carrying cruciform fillet welded plate and longitudinal butt welded plates were tested. The obtained S-N curves for the weld details are compared each other. To evaluate the fatigue life a simple model considering residual stress relaxation was proposed and applied. Estimated results show the developed model seems to be applicable.
구병춘(Byeongchoon Goo),서정원(Jungwon Seo) 한국자동차공학회 2001 한국 자동차공학회논문집 Vol.9 No.3
In the case of axisymmetric thermal analysis of drum brakes, the distribution of frictional heat produced on the interface and temperature difference between mating frictional faces are very interesting problems to computational researchers. In the first part, the influence of the s-cam load angles and elastic modulus of the pad on the contact pressure distribution between pad and drum was checked by a three dimensional model. In the second part heat conduction from the interface to the pad and the drum was modeled by using a thin interface element, so artificial division of the generated frictional heat between pad and drum is not necessary. Temperature difference between mating frictional faces is successfully modeled by using the interface element. The influence of some parameters on the thermal distribution is checked. The analysis was performed by ABAQUS/Standard code.<br/>
구병춘(Byeongchoon Goo),서정원(Jungwon Seo) 한국자동차공학회 2003 한국 자동차공학회논문집 Vol.11 No.5
<br/> Rolling stock structures such as bogie frame and car body play an important role for the support of vehicle loading. In general, more than 25 years' durability is needed for them. A lot of study has been carried out for the prediction of the fatigue life of the bogie frame and car body in experimental and theoretical domains. One of the new methods is a probabilistic fatigue life evaluation.<br/> The objective of this paper is to estimate the fatigue life of the bogie frame of an electric car, which was developed by the Korea Railroad Research Institute (KRRI). We used two approaches. In the first approach probabilistic distribution of S-N curve and limit state function of the equivalent stress of the measured stress spectra arc used. In the second approach, limit state function is also used. And load spectra measured by strain gauges are approximated by the two-parameter Weibull distribution. Other probabilistic variables are represented by log-normal and normal distributions. Finally, reliability index and structural integrity of the bogie frame are estimated.<br/>
[구조강도부문] 유한요소법에 의한 드럼과 라이닝의 접촉해석
구병춘(Byeongchoon Goo),서정원(Jungwon Seo) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In the case of axisymmetric thermal analysis of drum brakes, the distribution of frictional heat produced in the interface and temperature difference between mating frictional faces are very interesting problems to computational researchers. In the first part, heat conduction from the interface to the pad and the drum was modeled by using a thin interface element, so artificial division of the generated heat flux between pad and drum is not necessary. Temperature difference between mating frictional faces is successfully modeled by using the interface element. In the second part the influence of some parameters on the thermal distribution is checked. The analysis was performed by ABAQUS/Standard code.
구병춘(Byeongchoon Goo),양승용(Seungyong Yang) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
To evaluate the fatigue lifetime of structures, it is necessary to identify the value of parameters through tests or literature. it is difficult for field engineers to get the necessary data through tests from the viewpoint of time and cost. In this study, we surveyed literature and proposed a procedure to identify the fatigue parameters for fatigue life evaluation by local strain approach and then we evaluated the fatigue lifetime for several kinds of welded joints. The simulated results are in a good agreement with experimental results.
구병춘(Byeongchoon Goo),양승용(Sungyong Yang) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Residual stresses play an important role in the mechanical behaviour of steels. To examine the effect of residual stresses on tensile behaviour, residual stresses in the specimens were generated by welding. Experimental stress-strain curves of the specimens with/without residual stresses were obtained and compared to simulated curves obtained by the finite element analysis. The two results are in a good agreement. Finally, to study the relaxation of the residual stresses during fatigue crack propagation, we carried out fatigue crack propagation analysis by the finite element analysis.
구병춘(Byeongchoon Goo),서정원(Jungwon Seo),정홍채(Heungchai Jung) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
In case of the fatigue life evaluation of rolling stock structures, mainly deterministic fatigue life evaluation has been carried out. But most of the parameters influencing on the fatigue life have a probabilistic distribution such as normal, log-normal, Weibull, etc. Therefore, to take probabilistic factors into fatigue life evaluation, probabilistic methods are being applied to the fatigue life evaluation of rolling stock. In this paper, probabilistic S-N analysis and methods using limit state functions are introduced. And some results of fatigue life evaluation obtained with these methods for rolling stock structures are shown.