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김기풍(Keepoong Kim),허훈(Hoon Huh),이기수(Kisoo Lee),이영우(Youngwoo Lee) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.5_2
In this paper, side impact analysis has been carried out considering constitutive model of auto-body materials. Finite element analysis on the side impact is simulated being based on FMVSS 214 test with LS-DYNA3D. Deformed shapes and crashworthiness have been compared about quasi-static constitutive model and dynamic model during automotive collision. The analysis results with dynamic constitutive equation have small deformation of the auto-body side part in comparison with ones with quasi-static constitutive equation. Impact characteristics and safety have been assessed from investigating the deformed shapes and impact forces of an auto-body.
김기풍(Keepoong Kim) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
This paper is concerned with the frontal crash analysis of an auto-body with AHSS(advanced high strength steels) in a structural member. In the analysis, the response surface method is utilized for finding optimum thickness when AHSS such as TRIP and DP steels are replaced for materials of the front rail member in ULSAB-AVC auto-body model. The crashworthiness for auto-body with optimum thickness is compared with the crash analysis results of the ULSAB-AVC model for not only energy absorption and crushing distance but also deceleration. In this paper, a new optimization procedure has been proposed in order to employ AHSS in the front rail member in conclusion and various AHSS can be employed in structural members of an auto-body with the new procedure.
김기풍(Keepoong Kim),김세호(Seho Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
In this paper, optimization for frontal crashworthiness is carried out for the weight reduction design of an auto-body member with aluminium extrusions. The frontal crashworthiness is evaluated in order to optimize thicknesses for the front rail member of the ULSAB-AVC. Thicknesses of the front rail member made of aluminium extrusions are optimized by comparison of crushing distance, absorbed energy, the deceleration and compartment intrusions for the auto-body with the response surface methodology. The results demonstrate that the crashworthiness of the front rail member made of aluminium extrusions with the optimum thicknesses is similar to analysis results obtained from the ULSAB-AVC project. The results also show that the weight reduction design is performed by substituting the aluminium alloys for steels such as 440E and advanced high strength steels in the auto-body members.
구조부재의 충돌해석을 위한 유한요소 극한해석의 동적 수식화
김기풍(Keepoong Kim),허훈(Hoon Huh) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_2
In this paper, the limit analysis concept is extended to consider the dynamic equilibrium condition considering the incrtia and strain-rate effects instead of the static equilibrium. A dynamic formulation for the limit analysis has been derived for incremental analysis dealing with time integration, strain and stress evaluation, strain hardening, strainrate hardening and thermal softening. The time dependent term in the governing equation is integrated with the WBZ-α method, which proposed by Wood, Bossak and Zienkiewicz. The dynamic material behavior is modeled by<br/> the Johnson-Cook relation in order to consider strain-rate hardening and thermal softening as well as strain hardening.<br/> Simulations have been carried out for crash analysis of structural members and numerical results are compared with clastic-plastic analysis results by ABAQUS/standard and LS-DYNA3D. Comparison demonstrates that the dynamic finite element limit analysis can predict the crashworthiness of structural members effectively with less computing time and effort than the commercial codes compared. The crashworthincss of the structure with the rate-dependent constitutive model is also compared to the one with the quasi-static constitutive relation for demonstration.<br/>
[구조강도부문] 유한요소 극한해석을 이용한 굴곡을 가진 박판부재의 단면비에 따른 붕괴특성 평가
김기풍(Keepoong Kim),김현섭(Hyunsup Kim),허훈(Hoon Huh) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper is concerned with collapse characteristics and an energy absorption capacity for thin-walled structures with curved shape with respect to aspect ratio of cross-section. The energy absorption capacity influence on yield strength and geometric shape such that shape of cross-section and thickness. S-rails with several aspect ratio of rectangle cross-section are selected for thin-walled structures with curved shape. The analysis of an S-rail has been carried out using finite element analysis for evaluation of collapse characteristics. For collapse analysis of an S-rail limit analysis formulation with shell element has been derived and a contact scheme has been considered. Collapse analysis has been carried out for an S-rail with several rectangle cross-section and the energy absorption ratio with respect to aspect ratio of cross-section is calculated. From this result, references for fundamental design have been shown for thin-walled structures with curved shape.