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송준혁,노홍길,강희용,양성모 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-
A FQI(fatigue quality index) analysis using the concept of SF(severity factor) is performed to various shape of elliptical hole. FQI is fatigue quality index to estimate the dynamic SF from static SF by finite element analysis. Since the SF is affected by the location of cutout in plate and radius ratio, static SF is analyzed with finite element method and forms the equation of FQI for predicting a dynamic SF. To examine the validity, dynamic SF is measured by photoelastics and thermalelastics for an epoxy resin plate with various elliptical holes under dynamic load.
송준혁,노홍길,김홍건,유효선,강희용,양성모 한국공작기계학회 2004 한국생산제조학회지 Vol.13 No.2
Vehicle structures are composed of m y substructures connected to one another by various types of mechanical joints. In vehicle engineering, it is important to study these connected structures under various dynamic forces for the evaluations of fatigue life and stress concentration exactly. It is difficult to obtain the accurate load history of specified positions because of the errors such as modeling, measurement, and etc. In the beginning of design, exact load data are actually necessary for the fatigue strength and life analysis to minimize the cost and time of designing. In this paper, the procedure of practical dynamic force determination is developed by the combination of the principal stresses of F. E. Analysis and experiment. Least square pseudo inverse matrix is adopted to obtain an inverse matrix of analyzed stresses matrix. The error minimization method utilizes the inaccurate measured error and the shifting error that the whole data is stiffed over real data. The least square criterion is adopted to avoid these errors. Finally, to verify the proposed procedure, a bus is analyzed. This measurement and prediction technology can be extended to the structural modification of any geometric shape in complex structure.
송준혁,강희용,양성모,島本聰 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.5
Most structures of automobile are composed of many substructures connected to one another by various types of mechanical joints. In automotive engineering, it is important to study these connected structures under various dynamic forces for the evaluations of fatigue life and stress concentration exactly. It is rarely obtained the accurate load history of specified positions because of the errors such as modeling measurement, and etc. In the beginning of design, exact load data are actually necessary for the fatigue strength and life analysis to minimize the cost and time of designing. In this paper, the procedure of practical dynamic load determination is developed by the combination of the principal stresses of F.E.analysis and experiment. Inverse problem and least square pseudo inverse matrix are adopted to obtain an inverse matrix of analyzed stresses matrix. Pseudo-Practical dynamic load was calculated for Lab. Test of sub-structure. GUI program(PLODAS) was developed for whole of above procedure. This proposed method could be extended to any geometric shape of structure.
송준혁(Joonhyuk Song),유효선(Hyosun Yu),강희용(Heeyong Kang),양성모(Sungmo Yang) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Spot welding process is completed in very short time and there are many factors affecting on the generation of welding defects. There are difficult to control experimental factors. Even more this is hard to monitor of distribution stress in practical cases. The purpose of this study is to investigate the applicability of infrared thermagraphy for the evaluation of spot weldability in view of fatigue life. In this study, infrared stress analysis adopting an infrared thermography for nondestructive evaluation of spot weldability is investigated. Using temperature and IR stress distribution obtained by infrared camera from adiabatic heat expansion under a repeated load of sinusoidal waves, we estimated the fatigue quality index of spot welded specimens. And evaluated corrected S-N curve from original fatigue life curve of base metal.