한국정밀공학회지 (Journal of the Korean Society for Precision Engineering)

  • 제17권1호
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  • Pages.153-163
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  • 2000
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  • 1225-9071(pISSN)
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  • 2287-8769(eISSN)
한국정밀공학회 (Korean Society for Precision Engineering)
권호 표지

시편크기의 영향을 고려한 J-A$_2$ 방법에 의한 파괴인성 평가

Evaluation of Fracture Toughness by J-A$_2$ Method Considering Size Effect

  • 이정윤 (한국전력기술(주) 원자로설계개발단) ;
  • 김영종 (한국과학기술) ;
  • 김용환 (충남대학교 기계설계공학) ;
  • 김재훈 (충남대학교 기계설계공학과)
  • 발행 : 2000.01.01
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초록

The size effect on fracture toughness was investigated by introducing $J-A_2$ theory. For this application,small size specimens were chosen to establish $J-A_2$ assessment curve with FEM analysis. Two-dimensional FEM analysis was conducted with plane strain model using ABAQUS by domain integral method to calculate both crack tip stress and fracture toughness which were used to establish $J-A_2$ curve. The assessment curve predicted the fracture toughness of large specimens very well when compared to the test values. The results showed good prediction for deep crack specimen, though there were acceptable deviations in shallow cracked specimens, presumably caused by constraint effect. When the curve applied to reactor vessel in order to predict end of life fracture toughness with assumption of on-power pressure test condition, it provided the reasonable pressure compared to the existing design value. Better predictions would be possible if more test data were available.

키워드

참고문헌

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