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김형욱(H.W.Kim),어광준(K.Euh),김수현(S.H.Kim),김동배(D.B Kim),김원경(W.K. Kim) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
Al6022/Al50231 Al6022 clad sheets were fabricated by roll bonding at ambient temperature and the mechanical properties of the annealed sheets were investigated. The bonding strength of the sheets increased with increasing thickness reduction rate of roll bonding. No defects like crack or void are observed at the bonded interface after roll bonding at thickness reduction rate above 50%. After annealing at 480℃ for 1 min., the sheets have a well bonded interface without void and 2<SUP>nd</SUP> phase and the microstructure of the sheets consisted of fully recrystallized grains. Stress-strain curves show same strain hardening characteristics with core Al5023 alloy sheets. Meanwhile the elongation of the sheets was higher than that of commercial Al6022 or Al5023 alloy sheet. Especially, the local elongation of the sheets increased about 5~6% compare to the Al5023 alloy sheet. The sheet showed very low tensile anisotropy due to different deformation characteristics of each layer in clad sheets.
디젤 입자상물질 후처리 장치에서 입자상물질의 연소에 미치는 재생 인자의 영향
김재업(J.U.Kim),조훈(H.Cho),김형욱(H.U.Kim),박동선(D.S.Park),김응서(E.S.Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
The effects of the regeneration parameters such as inlet gas temperature, space velocity, oxygen concentration of the exhaust gas, and initial particulate loading on the oxidation of the particulate inside ceramic cordierite filter have been investigated through an engine experiment. As the inlet gas temperature increases, the remarkable filter temperature occurs owing to the rapid combustion rate. Though the higher space velocity affirms the safe regeneration, it also requires much fuel consumption of the burner. For that reason, the space velocity should be compromised considering the fuel economy. The excessive accumulation of the particulate may cause undesirable regeneration temperatures inside filter even under the optimized regeneration condition.<br/> The inlet gas temperature should be selected to overcome the variation of the oxygen concentration which is inherent feature of the diesel engine. It is the most important factor in the regeneration control techniques.<br/>