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부식피트 및 코팅층을 갖는 치과용 임플란트의 피로수명의 유한요소해석
김민건(Min-gun Kim),이지훈(Ji-hun Lee),김요셉(Yo-seb Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The body environment causes the generation of corrosion pit on the surface of dental implant and it brings a stress concentration. Therefore, the body environment reduces the fatigue life of implant. Also the hardened layer coated at the surface of abutment screw brings a large stress concentration. The reaction of a body environment like a electrical effect, bit force and body fluid makes a corrosion by breaking away the resistance oxide film from the fixture. Finally it leads dental implant's fracture by a fatigue. In this paper, the evaluation of the fatigue life using the three-dimensional finite element method for stress analysis has been made by FEMFAT. At that, it was concerned with ISO 14801 rules. The estimating the fatigue life is based on stress-life curve of pure Titanium.
김민건(Min-gun Kim),김동열(Dong-youl Kim),조석수(Seok-swoo Cho),김요셉(Yo-seb Kim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
In order to assess the stiffness of bearing screw used for lead screw, finite element analysis on stress and fatigue life of bearing screw has been formed. Based on these analysis, fatigue life dominant model of bearing screw was proposed. This improved model introduces a fillet to release the concentrated stress generated in the vicinity of bearing screw hole. This paper also considered the strength suitability when the bearing screw manufactured in W company was applied to X-ray CT.
김민건(Min-gun Kim),조석수(Seok-swoo Cho),김동열(Dong-youl Kim),김요셉(Yo-seb Kim) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.12
리드스크루에 사용되는 베어링 스크루의 강성을 평가하기 위해서, 먼저 베어링의 응력과 피로수명의 유한요소해석을 수행하였다. 해석결과의 값을 바탕으로 베어링 스크루의 피로수명이 향상된 모델을 제안하였다. 이 개선된 모델은 베어링 스크루 응력집중부의 응력을 분산시키기 위한 필릿을 도입한 것이다. 또한, W사에서 제작된 베어링 스크루가 단층촬영기에 사용되었을 때 강도측면에서의 적합성 여부를 검토하였다. In order to assess the stiffness of bearing screw used for lead screw, finite element analysis on stress and fatigue life of bearing screw has been performed. Based on these analysis, fatigue life dominant model of bearing screw was proposed. This improved model introduces a fillet to release the concentrated stress generated in the vicinity of bearing screw hole. This paper also considered the strength suitability when the bearing screw manufactured in W company was applied to X-ray CT.