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Effect of Epoxy Cracking on Initial Quench Behaviorabout High Field Superconducting Magnet
이병섭,유종신,김동락,최연석,양형석 한국초전도.저온공학회 2006 한국초전도저온공학회논문지 Vol.8 No.4
The study to be presented related on initial behavior of quench concerned with many considerations, such as epoxy impregnated coil, critical current density related on strain and temperature, winding effect and behavior of internal superconducting wire. Especially, the deformation behavior of coils under magnetic field and thermal contractions at cryogenic temperatures to be dealt with the analytical method related on Fracture Mechanics. From the results, we know that the strain by self weight contribute to epoxy cracking at the edge of deformed coils and the deformation behavior relate on epoxy cracking must be dealt with biaxial loading problem. Then, the epoxy crack on rθ-plane under biaxial loading have been propagated with inclined crack angle and joined superconducting wire. Also, we can explain transfer of epoxy crack propagation energy from epoxy resin to superconducting wire.
초정밀 가공기를 이용한 적외선 우주망원경용 렌즈의 절삭가공기술개발
양순철,김동락,남욱원,김건희,유종신,김효식,신현수,홍권희,박수종 한국기계가공학회 2005 한국기계가공학회지 Vol.4 No.2
Machining technique for optical crystals with single point diamond turning tool is reported in this paper. The main factors influencing the machined surface quality are stu야ed and regularities of machining process are drawn. Optical crystals have been known to more and more important applications in the field of modern optics. Ge is more brittle material of poor machinability. The traditional machining method is polishing which has many shortcomings such as low production efficiency, poor ability to be automatically controlled and edge effect of the workpiece. The purpose of our research is to find the optimum machining conditions for ductile cutting of Ge and apply the SPDTM technique to the manufacturing of ultra precision optical components of Ge. As a result, the surface roughness is the best when cutting speed is 180m/min, feed rate is 2㎜/min, depth of cut is 0.5㎛ and nose radius of tool is 0.8㎜.