핵연료상단고정체 누름스프링 체결나사의 파손해석

다국어 초록 (Multilingual Abstract)

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.

목차 (Table of Contents)

• Abstract
  
• 1.서론
  
• 2.누름스프링체결나사의 응력해석
  
• 3.파괴역학적 해석
  
• 4.결론
  
• 후기
  
• 참고문헌