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황한영(Hwang H.Y.),고승기(Koh S.K) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.9
Stress analysis of a diaphragm made of HNBR rubber used for a damper in a vehicle self-leveling system was performed. Finite element technique was used for the stress analysis of the diaphragm with two types of SR and SS. Loading was divided into two steps of assemblage of diaphragm in the damper and internal pressure on the diaphragm. High stress and strain concentrations were observed at the lower end of both types of diaphragms. SR type of diaphragm was superior to SS type in static strength and fatigue cracking was expected at the local region of diaphragm which was in contact with the lower holder in the damper system.
고승기(Koh S.K),황한영(Hwang H.Y) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Strength analysis of a diaphragm made of HNBR rubber used for a damper in a vehicle self-leveling system was performed. Finite element technique was used for the stress analysis of the diaphragm with two types of SR and SS. Loading was divided into two steps of assemblage of diaphragm in the damper and internal pressure on the diaphragm. High stress and strain concentrations were observed at the lower end of both types of diaphragms. SR type of diaphragm was superior to SS type in static strength and fatigue cracking was expected at the local region of diaphragm which was in contact with the lower holder in the damper system.
Gas Blow Forming 공법을 적용한 스틸튜브재 확관성형 공정에 관한 연구
정경근,김동옥(D. O. Kim),이상일(S. I. Lee),김정섭(J. S. Kim),황한영(H. Y. Hwang),K. G. Kim 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
Due to the high demanding for fuel efficiency and more strict regulation for CO2 emission, automotive companies have focused their R&D activities onto the reduction of body and chassis components by using high strength steel. Some of the companies have used gas blow forming process for aluminum extrusion parts since it can be formed under the 500℃. However, its commercialization has been limited due to the high cost of aluminum alloys and relatively low strength compared to that of steel. Thus, in this research, steel tube has been gas blow formed under high temperature for a chassis application, and optimized design and process parameters have been studied. Tube bending and bulge forming simulation has been carried out, and it was compared to the experimental results.