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유한요소법을 이용한 자동차 조향 볼 조인트의 정적 강도평가
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.
자동차구조용 SiCp/Al-Si복합재의 피로균열 진전특성에 대한 연구
고승기(Seungkee Koh),이해무(Haemoo Lee) 한국자동차공학회 2005 한국 자동차공학회논문집 Vol.13 No.4
In order to investigate the behavior of fatigue crack growth of SiC-particulate- reinforced Al-Si alloy composites, fatigue tests using single edge notched tension(SENT) specimens were performed. Composite materials were manufactured by using both permanent die casting and extrusion processes with different volume fractions of 10% and 20%. SiCp-reinforced Al-Si composites showed the increased levels of threshold stress intensity factor range, ΔKth, for the increased volume fractions of SiC particles, which implies the increased fatigue crack growth resistance at the threshold or low ΔK levels, compared to the unreinforced Al-Si alloy. In the Paris region, however, the composites showed the increased rate of crack growth resulting in the unfavorable effects on the fatigue crack growth resistance. Critical stress intensity factor range at unstable crack growth leading to final fracture decreased as the volume fraction of SiC particle increased, because of the reduced fracture toughness of the composites. Extruded materials showed higher threshold and critical values than the cast materials.
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.
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.
중형 상용차용 프로펠러 샤프트의 구조 강도 개선에 관한 연구
문홍주(Hongju Moon),심기중(Kijoong Sim),조규춘(Kyuchun Cho),최규재(Gyoojae Choi),고승기(Seungkee Koh),이영춘(Youngchoon Lee) 한국자동차공학회 2017 한국 자동차공학회논문집 Vol.25 No.4
In this paper, we would like to suggest ways in which to improve the strength of the spider, which is the vulnerable part of the double cardan propeller shaft(DCPS) in medium-duty commercial vehicles. DCPS is omposed of a universal joint that consists of spider and yoke, tube, cover spline, and so on. To improve the spider’s structural strength, the DCPS assembly model is designed with an ANSYS workbench. This developed model can analyze the strength of the DCPS, and can validate the results of the analysis through a strength test. Finally, we would like to introduce a new spider design that is 20 % stronger than previous DCPS models.
심기중(Kijoong Sim),문홍주(Hongju Moon),최규재(Gyoojae Choi),고승기(Seungkee Koh),이영춘(Youngchoon Lee) 한국자동차공학회 2018 한국 자동차공학회논문집 Vol.26 No.3
In this paper, we suggested the means to improve the strength of the drive shaft, a vulnerable part of the drive axle system in a 3.5-ton commercial vehicle. Drive shaft is composed of a universal joint with spider and yoke, yoke shaft, etc. To enhance the strength of the drive shaft, the design parameters of the spider, such as distance and diameter, were revised after CAE analysis. Drive shaft is designed as four case analysis models with ANSYS. These models can analyze the strength of the drive shaft and validate the results of the analysis with four case models. Finally, we suggested a spider design that reduced the spider’s maximum stress by 44 %.
3.5톤 상용차용 트랜스퍼케이스 헬리컬 기어의 굽힘 응력 해석
심기중(Kijoong Sim),문홍주(Hongju Moon),최규재(Gyoojae Choi),고승기(Seungkee Koh),전남진(Namjin Jeon) 한국자동차공학회 2017 한국 자동차공학회논문집 Vol.25 No.4
This paper presents an improvement in the design of the transfer case helical gear for a 3.5 ton commercial vehicle. Helical gear has been used increasingly as a power transmitting gear due to its relatively smooth and silent operation, large load carrying capacity, and high-speed operation. The bending stress is a key parameter in gear design. Theoretical equation and FEM analysis were used to determine the bending stress of the helical gear. The major factors in a theoretical equation were based on AGMA standards, and a simplified finite element model was created. The results obtained from the FEM were compared with the theoretical equation, and the difference in the maximum bending stress was discussed.
[응용논문] 3.5톤 상용차 동력분배용 중간변속기 개발
심기중(Kijoong Sim),문홍주(Hongju Moon),최규재(Gyoojae Choi),고승기(Seungkee Koh),전남진(Namjin Jeon) 한국자동차공학회 2018 한국 자동차공학회논문집 Vol.26 No.3
This paper discussed the development of the transfer case involving a 3.5-ton commercial vehicle. A transfer case is mainly used as a power distribution system between the transmission and the front/rear axle. In this paper, the main parts of the transfer case, such as power transfer shaft, helical gear, bearing, etc., were verified through CAE simulation and performance tests. A developed transfer case is not damaged, not even a crack and fracture, after the strength and durability tests. Finally, a transfer case meeting the requirements of a 3.5-ton front axle driven commercial vehicle was developed. The results of the development would be used as an alternate to the existing transfer case after the vehicle test.