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고승기(Koh.S.K),류창훈(Ryu.C.H),이정준(Lee.z.J),나의균(Na.E.G),백태현(Baek.T.H),전경락(Jeon.K.L.) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
A failure analysis of holddown spring screw was performed using fracture mechanics approach. The<br/> spring screw was designed such that it was capable of sustaining the loads imposed by the initial<br/> tensile preload and operational loads. In order to investigate the cause of failure, a stress analysis of<br/> the top nozzle spring assembly was done using finite element analysis and a life prediction of the<br/> screw was made using a fracture mechanics approach. The elastic-plastic finite element analysis<br/> showed that the local stresses at the critical regions of head-shank fillet and thread root significantly<br/> exceeded than the yield strength of the screw material, resulting in local plastic deformation. Primary<br/> water stress corrosion cracking life of the Inconel 600 screw was predicted by using integration of<br/> the Scott model and resulted in 1.42 years, which was fairly close to the actual service life of the<br/> holddown spring screw.