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액상성형법에 의해 제조된 고성능 BMI기지 복합재의 구조물성
김진봉(J.B. Kim),김영규(Y.G. Kim),엄문광(M.K. UM),변준형(J.H. Byun) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
This paper is focused on the investigation of the mechanical property of the carbon fabric/BMI composite laminate. The carbon fabric/BMI composite laminate can be one of light-weight structural materials in aerospace engineering for high temperature application over 170℃. The composites laminate plates were made through RTM process. To check the validity of the composite material for the application, the mechanical characteristics of composite specimens from as-received and environmentally conditioned plates were investigated. The mechanical tests were performed according to the MIL-HDBK-17 and ASTM standards
정태은(T.E.Chung),변준형(J.H.Byun),안상균(S.K.Ahn),이경헌(K.H.Lee),이동찬(D.C.Lee) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
This paper examines finitie element models for studying of the frictional heating of rolling stock wheel by wheel tread braking. The Main purpose of this study is to obtain the thermal stress distribution in wheel. CFD(Compter aided Fluid Dynamic)analysis is performed to obtained reliable heat convection coefficients in wheel surface. Heat convection coefficients from CFD analysis is compared with reference data. Various thermal loading case is investigated and fluctuating heat flux is calculated by considering actual operation condition of wheel. Finite element method is adopted to ged temperature distribution and thermal stress distribution in wheel with linear analysis.<br/>
이상용(S.Y Lee),윤한용(H.Y Yoon),엄문광(M.K Um),변준형(J.H Byun),임재규(J.K Lim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In a number of manufacturing process for composite structures, the resin flow is an important factor for process prediction and development. So this paper presented optimal resin infusion temperature about resin flow. A composite plate which is composed of carbon fabric and RTM6 resin was fabricated by resin transfer molding(RTM) process. To optimize a process condition such as an infusion temperature, permeability of the preform and viscosity of RTM6 resin were measured. The optimal temperature of the resin during infusion was suggested by characterizing a viscosity-flow relation. The derived relation shows that the total flow length is proportional to the time integral of a reciprocal of viscosity. The suggested method can be used to any resin system to maximize a resin flow.
다축경편 복합재료의 기계적 체결시 인장 및 압축하중에 대한 응력해석
오근성(K.-S Oh),전흥재(H.-J Chun),변준형(J.-H Byun),엄문광(M.-K Um),강경탁(K.-T Kang) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
When MWK (Multi-axial Warp Knitted Fabric) composites are applied for the structures, the connections of each component using mechanical fastening are needed. The local contacts between the bolts and the composite laminates may induce high stress concentration in the laminates. In this study, stress analysis near the hole boundaries of MWK composite laminate are conducted with various geometric factors under different loadings. In the case of single and multi-pin loaded MWK composites laminates, the results show that the types of loadings and geometric factors of mechanical joints have a significant influence on the joint performances.
조용범(Y. B. Cho),고정환(J. H. Ko),신효철(H. C. Sin),변준형(J. H. Byun) 한국자동차공학회 2000 한국 자동차공학회논문집 Vol.8 No.5
European side impact analysis of an electric vehicle was done using robust design. Locations and section properties of some of the vehicle structure components which influence the european side impact characteristics were chosen as the main factors for the robust design. Eight factors were considered for the analysis: one with two level and seven with three level combinations comprising the L_18(2¹×3^7) orthogonal array. It is shown that the sensitivities of the factors and the best combination of the factors can be obtained, and that the location of the main components were as much sensitive as the section properties of those. Also it is shown that the interactions were existed between some factors.