Proceedings of the KSME Conference (대한기계학회:학술대회논문집)

The Korean Society of Mechanical Engineers (대한기계학회)
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A Study on the Fracture Stress in Miniaturized Charpy Impact Specimens

소형 샤르피 충격시험편에서의 파괴응력에 관한 연구

  • 남승훈 (한국표준과학연구원 산업측정표준부) ;
  • 김엄기 (공주대학교 기계공학부) ;
  • 이대열 (공주대학교 대학원 기계공학부) ;
  • 김시천 (한국표준과학연구원 산업측정표준부)
  • Published : 2001.06.27
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Abstract

Miniaturized specimen technology is useful to characterize the mechanical behavior using a minimum volume of material, because it is almost impossible to sample the conventional specimen for the fracture toughness test without damage to equipment. Test material was 1Cr-1Mo-0.25V steel which was widely used for turbine rotor material. Two kinds of miniaturized impact specimens were prepared, i.e., miniaturized specimen with side groove and without side groove. The correlation between ductile brittle transition temperature(DBTT) of full size impact specimen and that of miniaturized impact specimen was made. The characteristics of miniaturized impact specimens technique as well as fracture stress were discussed. Finally, we concluded that the characteristics of fracture stress change on aging time were similar to that of DBTT.

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