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고강도강에 적용된 경량 차체부품의 정적 및 동적 강성에 관한 연구
이현철(Hyun-chul Lee),김민근(Min-geun Kim),고건영(Gun-young Go),한승남(Seung-nam Han) 한국자동차공학회 2019 한국 자동차공학회논문집 Vol.27 No.4
In order to cope with the recent fuel efficiency and exhaust emission regulation of vehicles, vehicle weight reduction has become an indispensable item rather than an option. Domestic and overseas automakers are continuously conducting research to address these lightweight issues. Among these methods for weight reduction, the application of high-strength steel with a relatively low price and lightweight effect is increased. Strength is improved when the material is replaced with high-strength steel; however, it is difficult to expect stiffness improvement to enhance the driving safety required for the automobile. In this paper, the study on stiffness improvement through the finite element analysis and the test evaluation of stiffness according to the application of high-strength steel body part are carried out. It is also confirmed that the stiffness improvement according to the application of high-strength steel is only possible through structural optimization.
핫스탬핑 공법을 적용한 1.5 GPa급 일체형 사이드아우터 개발
이현철(Hyun-chul Lee),김민근(Min-geun Kim),고건영(Gun-yung Go),박승연(Seung-youn Park),한승남(Seung-nam Han) 한국자동차공학회 2019 한국 자동차공학회논문집 Vol.27 No.3
Various researches have recently been conducted on the depletion of fossil fuel and environmental regulation in the development of automobiles. In order to comply with environmental regulations, lightweight technology to reduce the weight of the vehicle body is essential for improving fuel economy. The crashworthiness and NVH performance of the vehicle must be satisfied at the same time in order to meet the safety and performance requirements for the passengers. For the crashworthiness, it is necessary to apply high strength steel. However, the formability of the high strength steel is low and the application of high strength steel to the car body is limited. Hot stamping is a technology that involves heating the steel sheet over austenite transformation temperature and directly quenching it in the cold mold. It can also secure crashworthiness, as well as formability for lightweight technology. In general, a car body part consisting of various reinforcement and joining technology is required, but one-piece parts were developed by applying hot stamping technology for weight reduction and strength enhancement. In order to achieve high strength, a specific cooling rate(35 °C/s) is required for martensitic transformation in hot stamping of high strength steel. In this study, the major variables of the hot stamping process, which are the initial temperature of the steel and the mold cooling rate, were measured. In addition, the integrated type side outer, which satisfied both weight reduction and crashworthiness, was developed by evaluating the crashworthiness through the drop impact test.