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김영신(Y. S. Kim),임재곤(J. G. Lim),전만수(M. S. Joun) 한국소성가공학회 2016 한국소성가공학회 학술대회 논문집 Vol.2016 No.4
In this study, die elastic deformation considered simulation of an aluminum fixed scroll forging process, a kind of forward extrusion process, is conducted, which is very special because of complexity in die geometries. The material is assumed rigid-viscoplastic and the dies are elastically behaved. The predictions are compared in terms of dimensions and forming load with the other predictions obtained without consideration of die elastic deformation during forging. The reasons of die fracture occurring in hot aluminum forging of a fixed scroll are revealed using finite element predictions.
김영신(Y. S. Kim),지영무(Y. M. Ji),이재우(J.-W. Lee),박준상(J. S. Park) 한국전산유체공학회 2004 한국전산유체공학회 학술대회논문집 Vol.2004 No.-
This paper describes a supersonic separation of air-launching rocket from the mother plane. Three dimensional Euler equations were numerically solved to analyze steady/unsteady state fluid flows. To solve the Euler equations, named CFD- FASTRAN that is commercial computation code. The results of simulation clearly demonstrate effect of shock-expansion wave interaction between the rocket and the mother plane. Moreover, important influential factors at separating stage of the rocket were extracted with a comprehensive analysis. Finally, from the consideration of supersonic-separation, a guideline to safety-separation is given to the design of supersonic air-launching rocket.