Journal of Welding and Joining

  • 제21권5호
  • /
  • Pages.575-581
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  • 2003
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  • 2466-2232(pISSN)
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  • 2466-2100(eISSN)
대한용접접합학회 (The Korean Welding and Joining Society)
권호 표지

동적하중 하에서의 강도적 불균질재의 연성크랙 발생거동의 실험적 검토 - 강도적 불균질 및 동적부하의 영향에 의한 연성크랙 발생조건 (제1보) -

Experimental Examination of Ductile Crack Initiation with Strength Mismatch under Dynamic Loading - Criterion for Ductile Crack Initiation Effect of Strength Mismatch and Dynamic Loading (Report 1) -

  • ;
  • Mitsuru Ohata (Graduate School of Engineering, Osaka University) ;
  • Masao Toyoda (Graduate School of Engineering, Osaka University)
  • 발행 : 2003.09.01
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초록

It has been well known that the ductile cracking of steel would be accelerated by triaxial stress state. Recently, the characteristics of critical crack initiation of steels are quantitatively estimated using the two-parameters, that is, equivalent plastic strain and stress triaxiality, criterion. This study is paid to the fundamental clarification of the effect of geometrical heterogeneity and strength mismatching, which can elevate plastic constraint due to heterogeneous plastic straining, and loading rate on ductile crack initiation behavior. Also, the ductile crack initiation testing were conducted under static and dynamic loading using round bar specimens with circumferential notch and strength mis-matching. The result showed that the nominal strain at ductile crack initiation of circumferential notch specimens small then the round bar specimens for effect of geometrical discontinuity. Also, the nominal strain at ductile crack initiation was decreased with decrease of notch root radius of curvature.

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참고문헌

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