http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
고승기(Koh S.K.),류창훈(Ryu C.H.) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
A lifetime prediction of holddown spring screw in nuclear fuel assembly was performed using fracture mechanics approach. The spring screw was designed such that it was capable of sustaining the<br/> loads imposed by the initial tensile preload and operational loads. In order to investigate the cause of failure and to predict the stress corrosion cracking life of the screw, a stress analysis of the top<br/> nozzle spring assembly was done using finite element analysis. The elastic-plastic finite element analysis showed that the local stresses at the critical regions of head-shank fillet and thread root<br/> significantly exceeded than the yield strength of the screw material, resulting in local plastic deformation. Normalized stress intensity factors for PWSCC life prediction was proposed. Primary<br/> water stress corrosion cracking life of the Inconel 600 screw was predicted by using integration of the Scott model and resulted in 1.78 years, which was fairly close to the actual service life of the<br/> holddown spring screw.
고승기(S.K. Koh),김병운(B.W. Kim),원삼용(S.Y. Won),류창훈(C.H. Ryu) 한국자동차공학회 2002 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
In order to investigate the behaviors of fatigue crack propagation of SiC-particulate-reinforced Al-Si metal matrix composites, fatigue tests using single edge notched tension(SENT) specimens were performed. Composite materials were manufactured by using both permanent die casting and extrusion processes with different volume fractions of 10% and 20%. SiCp-reinforced AI-Si composites showed higher levels of threshold stress intensity factor range, ??K??, for the higher volume fractions of SiC particles, implying the higher fatigue crack propagation resistance at the threshold or low ??.K level, compared to the unreinforced Al-Si alloy. Extruded materials showed higher values of threshold L'.K than the cast materials. However, the composites showed similar or lower resistance of fatigue crack propagation at the Paris region compared to the unreinforced Al-Si alloy. Stress intensity factor range at fracture decreased. as the volume fraction of SiC particle increased due to the lower fracture toughness of composites with higher SiCp volume fraction.<br/>