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민한기(Hanki Min),양인영(Inyoung Yang) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.5_2
In the development stage of vehicle structures and components, there is a tendency to increase using numerical simulation methods for the estimation of fatigue strength. The advantage numerical simulation methods are especially marked when it is applied at a very early stage in the development process. The essential profit is the reduction of test loops with different structure and component variants due to pre-optimized prototypes by numerical simulation. However, the estimation of fatigue strength has been difficult since fully integrated computer aided engineering(CAE) technique for durability evaluation was not developed.<br/> In this study, simple and accurate analysis technique is suggested for farigue strength evaluation through virtual proving ground(VPG) technique. And also, we verify the presented analysis method through durability evaluation of the knuckle of passenger car.<br/>
RUS 법을 이용한 세라믹제 Ferrule의 크랙 결함 평가
백경윤(Kyungyun Baek),민한기(Hanki Min),김영남(Youngnam Kin),양인영(Inyoung Yang) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
When an optical fiber is connected to the machinery, a ferrule is used to set the optical axes of an optical fiber very precisely. Therefore, it is required high dimensional precision, lack of defect and high expectations. Up to now the optical instrument has been used for the shape flaw inspection of the ferrule. But in this paper we examined the detectable defect and expectation by using the Resonant Ultrasound Spectroscopy (RUS). By making use of the principle of RUS, we made a new measurement system (RUS System). The RUS System is the measurement which is to excite specimen and to inspect the difference of natural frequency pattern between acceptable specimen and specimen which has some defects. Through the experiment we analyzed the difference of natural frequency pattem of these specimens and we chose the available mode in the plant. To verify the data obtained from the experiment, we carried out the simulation from the explicit finite elements code, Nastran. And we compared the results in the experiment with those in the simulation.<br/>
계면수 변화에 따른 Al/CFRP 혼성구조부재의 에너지 흡수 특성
서현경(HyeonKyeong Seo),황우채(Woochae Hwang),민한기(Hanki Min),임광희(kwanghee Im),양인영(Inyoung Yang) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The aluminum or CFRP is representative of light-weight materials. The aluminum tubes absorb energy by stable plastic deformation and the CFRP tubes absorbs energy by unstable brittle failure with higher specific strength and stiffness. Based on the respective collapse characteristics of aluminum and CFRP tubes, the aluminum CFRP compound tubes were manufactured to get a synergy effect when the aluminum CFRP tubes were combined with the advantages of each tube. This paper is to investigate the collapse characteristics of square or circular shaped aluminum CFRP compound tubes subjected to quasi-static axial collapse tests which were conducted by changing the stacking conditions. The aluminum CFRP compound tubes were made of8 layers of these sheets and they are stacked at different interlaminar numbers with outer orientation angle 90°, due to better collapse characteristics than that with 0 degrees. Test results showed that the collapse of the aluminum CFRP tubes complemented unstable brittle failure of the CFRP tube due to the ductile characteristics of the inner aluminum tube. It turned out that interlaminar numbers of aluminum CFRP compound tubes have no influence on the energy absorption and collapse modes of the tubes.