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FutureSteelVehicle - leading edge innovation for steel body structures
Jaehyun Kim(김재현),Jaebok Nam(남재복),Sungho Park(박성호),Seungtaek Hong(홍승택),Soonyong Kwon(권순용) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
WorldAutoSteel launched Phase 2 of its FutureSteelVehicle program with the aim to show automakers how latest and future steel grades & technologies can provide light body structures for electrified vehicles. The objective was to develop detailed design concepts and fully optimise a radically different steel body structure for a compact battery electric vehicle in production in the 2015-2020 timeframe. This paper discloses the final outcomes of the Phase 2 development, detailing steel body structure concepts for the aforementioned vehicles that achieved the aggressive mass target of 190 ㎏, while meeting 2015-2020 crash performance objectives as well as total life cycle greenhouse gas emissions targets, NVH and stiffness. This is achieved using advanced & ultra high-strength steels, engineering design optimization and advanced steel technologies.
21-Cr 페라이트계 스테인리스강의 기계적 물성 모델링과 적용
정한용(Hanyong Jung),정양진(Yangjin Chung),박기철(Keecheol Park),남재복(Jaebok Nam) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In this paper, phenomenological material models describing anisotropic plastic behavior of 21-Cr ferritic stainless steel were investigated using three yield functions of Hill(1948), Barlat and Lian(1989) and Barlat et al.(2003, referred to as Yld2000-2d) criteria. Uniaxial tension and equi-biaxial bulge test were conducted for mechanical properties. Three yield functions calculated from experiments were used for comparing to the one element simulation using LS-DYNA. The results presented that the three directional tensile properties by Yld2000-2d criterion were in good agreement with tensile test Thinning distribution calculated by Yld2000 2d model was compared to those of the real part of door in
FutureSteelVehicle - Steel Technology Assessment and Design Optimization
Seungtaek Hong(홍승택),Soonyong Kwon(권순용),Jaehyun Kim(김재현),Jaebok Nam(남재복),Sungho Park(박성호) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
FutureSteelVehicle’s (FSV) objective is to develop detailed design concepts for a radically different steel body structure for a compact Battery Electric Vehicle (BEV). It also will identify structure changes to accommodate larger Plug-In Hybrid (PHEV) and Fuel Cell (FCEV) vehicle variants. The paper will demonstrate optimization of seven structural sub-systems that contribute to the programme’s 35 percent mass reduction goals and meet its safety and life cycle emissions targets. It will explain the state-of-the-future advanced design optimization process used and a new paradigm for selecting the best structural solutions for a Battery Electric Vehicle. Put Abstract here. Put Abstract
강연식(Yeonsik Kang),이홍우(Hongwoo Lee),김재현(Jaehyun Kim),정경환(Kyunghwan Chung),이현영(Hyunyoung Lee),남재복(Jaebok Nam) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
POSCO developed a new body concept for electric vehicle (PBC-EV, POSCO Body Concept ? Electric Vehicle) with the aim to identify requirements of new steel grades for electric vehicle and to provide cost efficient steel solutions to customer. The objectives are achieved by advanced steel technologies and engineering design optimization with the best attributes of steel ? its design flexibility, strength, formability and low manufacturing cost. PBC-EV features steel body structure designs that reduce weight to 218kg by 26 percent over a benchmark body of 296kg. The weight reduction has been realized through the use of advanced high strength steel grades by 65% of total body weight. The steel grades include TWIP, 2Gipa grade HPF steels as well as DP, CP and TRIP steels. A number of steel application technologies were also adopted to take the benefit of advanced steels. New forming technologies such as tailored hot press forming and multi-directional roll forming were applied as well as conventional manufacturing methods. Even though there is a cost premium associated with the use of higher grade steels, the consequently achieved weight savings and the optimal use of forming process minimize the overall cost increase of manufacturing and assembly. The total life cycle emission of PBC-EV is reduced by nearly 50 percent comparing to the benchmark internal combustion engine vehicle. These are accomplished while meeting a broad list of global safety requirements such as US FMVSS, IIHS and EuroNCAP. No damage of battery cell in the crash simulations is observed. In the last stage hardware demonstration was done by building BIWs (Body-in-White) excluding opening parts and fenders. It is very important for automakers to avoid unintended consequences by using eco-friendly steel technologies for advanced powertrain vehicle. With this project advanced steel solutions which are not only lighter and safer but greener can be provided to automakers.