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주원경(W.K. JOO),김형진(H.J. KIM),조기연(K.Y. CHO),박상욱(S.W. PARK),조명국(M.K. CHO) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In this study, bead portion is one of the most important part on the tire construction because the bead have to bear the head and contact pressure against the rim. Usually bead profile is designed to allow for the shape of rim. But the more compression between a bead and a rim is the better. This thesis shows that the optimized design of bead profile for better matching and compression between a bead and a rim.
주원경(W. K. Joo),왕일기(Y. Q. Wang),양현태(H. T. Yang),심창영(C. Y. Sim),송정일(J. I. Song) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The microstructures and mechanical properties of OFHC copper/STKM 11A for D-tube joints brazed using BAg filler metal at 870℃ for 20 minutes in NH₃ atmospheres were performed. Interfacial microstructures were observed in reaction layer. A brazing strength causes of decline with defects of pin hole and base metal by lack of penetration. In tensile test, the properties of joints clearance of 0.01㎜ are better than other joints clearance that has yield strength of elasticity area with the brazing length of 2.5㎜, and also suitable for the case of brazing length of 5.0mm. According to the results of FEA (finite element analysis) on the tensile test, the maximum stress and strain were generated apart from the interface in large deformation. Diffused layer was formed by counter diffusion action of base metal and filler metal layer, and crack between two base metals was not discovered. This is the main reason that fracture of test piece does not appear in copper base metal, and brazing department forms good junctures.
다구찌 방법을 이용한 유분리기의 브레이징 최적 공정 해석
주원경(W. K. Joo),왕일기(Y. Q. Wang),양현태(H. T. Yang),심창영(C. Y. Sim),송정일(J. I. Song) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.11
The purpose of this study is to find the optimization processing on Oil-separator brazing using Taguchi method which was generally used to analyze the effects of various control factors. Mini-Tab is a good for program that is making a selection using Taguchi method. The microstructures and mechanical properties of OFHC copper/STKM 11 A for Oil-separator joints brazed using BAg and BCuP filler metal in NH₃ atmospheres were performed. Interfacial microstructures were observed in reaction layer. First, We selected proper filler metal for Oil-separator brazing through the observation of SEM micrographs and tensile test. A brazing strength causes of decline with defects of pin hole and base metal by lack of penetration. In tensile test, the properties of BCuP are better than other filler metal that has yield strength of elasticity area But it have so many defects. Second, using seleted filler metal, We applied Diffused Taguchi method by Mini-Tab. Finally, selected conditions improved more 12% for brazing strength than current processing on Oil-separator.
송정일(J. I. Song),권용구(Y. G. Kwun),주원경(W. K. JOO),왕일기(Y. Q. Wang) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
We developed 'Turny type power seat' that the disabled and old persons can safely get on and off a car from its driving seat. The developed power seat in this study is available located on the vehicle such as minivan, car. Because it is available located on the car with the rotation’s radius reduced that the height of getting on and off can be regulated. As a result, structure analysis of power seat modeling is based on a basis of ADA platform deflection to ensure safety. If the development of productive force is assured, the situation that the authoritative power seat depends on import will be replaced.
Cyclic Oxidation Behavior of Thermal Barrier Coatings Irradiated by High-intensity Pulsed Ion Beam
J. I. Song(송정일),Y. Q. Wang(왕일기),Y. G. Kwun(권용구),W. K. JOO(주원경) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
High-temperature oxidation resistance of 7 wt. % Y₂O₃-ZrO₂ thermal barrier coatings (TBCs) irradiated by high-intensity pulsed ion beam (HIPIB) has been investigated in a cyclic oxidation condition at 1050 ℃×1 h. The characteristics of the columnar grains disappeared after HIPIB irradiation at the ion current densities of 100-200 A/㎠, and the irradiated surface presented a smoothed, densified feature after the remelting and ablation due to the HIPIB irradiation. The cross-sectional morphologies of HIPIB-irradiated TBCs show less oxidation of the NiCoCrAlY bonding layer, with a thinner thermally grown oxide (TGO) layer. The morphology observation is consistent with the results of cyclic oxidation test. It is found that the inward diffusion of oxygen through TBCs can be significantly impeded by the desified top layer by the HIPIB irradiation, thus limiting the oxidation of the bonding layer, improving the overall oxidation resistance of the irradiated TBCs.