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튜블라 토션빔 액슬의 롤 내구 성능 개선 및 실험적 비교
고정민(Ko Jung Min),이경택(Lee Kyoung Teak),신명호(Shin Myong Ho),황상희(Hwang Sang Hee),김헌영(Kim Heon Young) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The advantage of tubular torsion beam axle is to have light weight, sufficient rear package. As time goes by, Target of roll stiffness of rear axle get higher than before for satisfied roll gain related to front and rear roll stiffness. In this study, We will do not only to find the design factor of tubular torsion beam required high roll stiffness, but to correlate between CAE analysis and actual test for design factor related to roll fatigue life of beam. And we will compare the results between forming simulation and prototype based on CAD data.
마그네슘을 적용한 자동차 시트 쿠션 패널 비등온 성형해석
서오석(Oh Suk Seo),이충안(Chung An Lee),박창수(Chang Su Park),김화진(Hwa Jin Kim),이경택(Kyoung Teak Lee) 한국자동차공학회 2016 한국 자동차공학회논문집 Vol.24 No.5
Mg alloy sheet exhibits significant differences in tensile and compressive yield stress depending on the temperature, as well as variations in its hardening behavior. Such unusual behavior makes it difficult to simulate the forming process of Mg alloy sheets. Results of analysis tend to deviate significantly from the experimental data because commercial software do not completely implement the unusual hardening behavior, yield asymmetry and temperature dependent changes in the Mg alloy’s material properties. In the previous study, an in-plane tension-compression cyclic tester was developed to predict the cyclic behavior of Mg alloy sheets at an elevated temperature of up to 250 °C. A new constitutive equation was suggested to analyze the unusual behavior, and was implemented in the commercial software in the form of user subroutine. In this paper, a stamping process of Mg seat cushion panel for automotive parts was simulated using the experimental data and user subroutine. Based on the analysis, an optimal temperature condition was determined and a stamping die shape at each step was suggested in the non-isothermal stamping of Mg alloy sheets.
김동현(Donghyun Kim),김대영(Dae-Young Kim),이경택(Kyoung Teak Lee),김헌영(Heon Young Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
In analysis of welded structures, the weld zone is generally described to be rigid or a multiple thickness, due to difficulties in finding a suitable modeling method and in collecting material data. This method has advantages of making modeling easy and free from the influence of analysis time. However, it is difficult to depict the mechanical property of the structure in this method. Therefore, this paper will present a weld zone modeling program in order to efficiently describe the weld zone of MIG welded structures. We have built 3 specimens on the basis of welding method in an effort to build a finite element model of the weld zone, we have observed the weld zone and have measured its hardness, using hardness tester. Using a relation of hardness and strength, we have collected material data of HAZ and nugget, and have performed the welding analysis in order to check out the residual stress and the deformation shape of the weld zone. Besides, we have compared the results with the those in strength experiment tests of the weld specimens, and have evaluated the reliability of the modeling in comparison with the existing modeling methods.