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고승기(Seungkee Koh),황한영(Hanyoung Hwang) 한국자동차공학회 2005 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Ball joints in an automotive steering system are used for transferring steering forces between links and tires. In this paper, stress analyses of ball joints consisting of body, ball stud, spring seat. and plug were performed to ensure the static strength in operation. Two types of engineering plastics instead of steels such as Nylon66 and Acetal were employed as spring seat materials. Elastic-plastic finite element analysis was done to simulate the plugging and axial loadings. Equivalent plastic strains in the Nylon66 and Acetal spring seats were 47% and 26%, respectively, resulting in the values less than fracture strains. Local plastic strains occurring in the steel plugs were much smaller than the fracture strain of the material. The plastic spring seats and steel plug were evaluated to satisfy the static strength of the ball joint. Further investigations were required to ensure the durability of the ball joint.
연문흠(Moonheum Yeon),고승기(Seungkee Koh) 한국자동차공학회 2013 한국자동차공학회 지부 학술대회 논문집 Vol.2013 No.5-1
In order to investigate the failure cause of the drum hub in a commercial vehicle, a finite element stress analysis was performed. The shape of the drum hub was modified for reducing the weight. A bolt hole in themodified drum hub was fractured during the press-fitting process of the bolt into the hole. From the stress analysis results, the stress concentration was observed in the outside region of the hole, where fracture might occur. Maximum stress of 535 MPa and maximum strain of 7.10% occurred near the bolt hole of the modified hub, which were close to the tensile strength and fracture strain of the drum hub material. Therefore, the hub bolt hole could fracture due to the straining by the bolting.
황한영(Hanyoung Hwang),고승기(Seungkee Koh) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Stress analysis of spring seat made of NBR rubber used for automotive steering ball joint was performed. Finite element technique was used for the stress analysis of the spring seat with two different section types of scoop and heart. Loading was divided into two step; plugging for ball joint assemblage and applied axial load for operation. High stress and strain concentrations were observed at the center hole of the scoop type rubber seat, where failure was expected. For the case of heart type rubber spring seat, magnitudes of stress and strain were quite small, resulting in better static/fatigue strengths than the scoop type rubber spring seat.