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용융탄산염 연료전지용 금속분리판 굽힘 공정의 유한요소 해석을 통한 스프링백 분석
이창환(C. H. Lee),류승민(S. M. Ryu),양동열(D. Y. Yang),김영진(Y. J. Kim),강동우(D. W. Kang),장인갑(I. G. Chang),이태원(T. W. Lee) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
Metallic bipolar plate for molten carbonate fuel cell(MCFC) is composed of the shielded slot plate and the center plate. Among these, the center plate plays an important role in gas sealing. Therefore, manufacturing of the center plate is considered one of the key issues in MCFC. The center plate is manufactured by bending process. In bending process, springback and recoiling are two main problems. By using the modified punch shape with ‘step’ springback and recoil are reduced. The aim of this article is to find the effect of modified punch shape. So, the bending stress along thickness direction and material direction were investigated using FEM.
성형 이력을 고려한 용융탄산염 연료전지용 금속 분리판의 압축 거동 특성 분석
이창환(C. W. Lee),양동열(D. Y. Yang),이승륜(S. R. Lee),강동우(D. W. Kang),장인갑(I. G. Chang),이태원(T. W. Lee) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
The metallic bipolar plates of the molten carbonate fuel cell (MCFC) are composed of shielded slot plates and a center plate. The shielded slot plate supports the center-plate and the membrane electrode assembly. In order to increase the contact area between shielded slot plates and the membrane electrode assembly, compressive forces are applied to the shielded slot plate. For these reasons, it is necessary to predict the mechanical behavior of the shielded slot plate. Because the shielded slot plates are manufactured from the three-stage forming process, the mechanical behavior of the shielded slot plate is largely affected by the forming process. In order to predict the mechanical behavior of the shielded slot plate precisely, the forming process of the shielded slot plate should be considered. In this study, simulation results of the forming process were employed to the simulation of the mechanical behavior of the shielded slot plate to consider the forming effect. The proposed simulation model considering the forming effect shows good agreements with the experimental results.
용융탄산염 연료전지용 쉴디드 슬롯 플레이트의 압축 및 적층 특성 분석
이창환(C. H. Lee),양동열(D. Y. Yang),이승륜(S. R. Lee),강동우(D. W. Kang),장인갑(I. G. Chang),이태원(T. W. Lee) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
The unit cell of the molten carbonate fuel cell(MCFC) is composed of metallic bipolar plate, anode, cathode and matrix. Among these, the shielded slot plate (the current collector) supports the membrane electrode assembly (MEA) and the stack mechanically. Therefore the compression properties of the shielded slot plate are necessary to design the MCFC stack. In order to analyze the compression properties, experiments were conducted using the unit cell, the anode shielded slot plate(ACC) and the cathode shielded slot plate(CCC). For the properties of the MCFC stack, 4 layers of the metallic bipolar plate were used. The deformation of the MCFC stack depends on the deformation of the cathode shielded slot plate.
연성파괴조건을 사용한 용융탄산염 연료전지용 금속 분리판의 성형 공정 유한요소 해석
이창환(C. H. Lee),양동열(D. Y. Yang),이승륜(S. R. Lee),강동우(D. W. Kang),장인갑(I. G Chang),이태원(T. W. Lee) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.10
The shielded slop plates of the molten carbonate fuel cell (MCFC) have a sheared corrugated trapezoidal pattern. In the FEM simulation of the shielded slot plate, the user material subroutine VUMAT is employed for the implementation of the ductile fracture criterion in the commercial FEM software ABAQUS. The experimental results of the shearing process were compared with the FEM simulation results in order to determine the critical damage value. Using this ductile fracture criterion, the three dimensional forming process of the shielded slot plate was numerically simulated. The effects of the shearing process on the forming process of the shieded slot plates were examined through FEM simulation and experiments. After springback the sheets shwo the warping due to the residual stress of the forming process.
고효율 근적외선 가열장치를 사용한 온간성형에서 DP980 소재의 스프링백 분석
이은호(E. H. LEE),황준선(J. S. HWANG),이창환(C. W. LEE),양동열(D. Y. YANG),양우호(W. H. YANG) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
In recent years, increasing attention for environment and safety have made high-strength steel be one of the most important materials. Especially, automobile industry has given much attention to high-strength steel sheets in order to obtain high fuel efficiency and safety for passengers. In high-strength steel sheet forming, however, Large springback after unloading has been a obstacle to expansion of usage. To reduce springback of high-strength steel sheet, warm forming has been consistently researched, but increasing temperature whole die or material consumes huge energy. Therefore in this research, DP980 sheet metals were heated only areas where plastic deformation occurs by NIR local heating devices. After that, V-bending and 2D-draw bending were carried out to Analysis springback. Also evaluation of possibility of NIR local heating was conducted through analysis of springback in V-bending and 2D-draw bending.
용융탄산염 연료전지용 금속 분리판의 기계적 거동 분석 및 균질화에 대한 연구
이창환(C. H. Lee),양동열(D. Y. Yang),이승륜(S. R. Lee),강동무(D. W. Kang),장인갑(I. G Chang),이태원(T. W. Lee) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
Metallic bipolar plates of the MCFC(Molten Carbonate Fuel Cell) are composed of one center plate and two shielded slot plates. The unit cell of the shielded slot plate is trapezoidal in shape. From the analytical analysis of the simplified model of the unit cell, the stiffness and strength of simple deformation are obtained. FEM simulations were conducted to verify the analytical result. The homogenized material model for a plastically compressible anisotropic core is employed to simulate the mechanical behavior of the unit cell. The coefficients of the orthotropic elasticity and the yield criterion are obtained from the FEM simulation of the unit cell. The comparisons of the mechanical behaviors are made between the unit cell and the homogenized model.