Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Formulation of Failure Strain according to Average Stress Triaxiality of Low Temperature High Strength Steel (EH36)

저온용 고장력강(EH36)의 평균 응력 삼축비에 따른 파단 변형률 정식화

  • Choung, Joonmo (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Nam, Woongshik (Department of Naval Architecture and Ocean Engineering, Inha University)
  • 정준모 (인하대학교 조선해양공학과) ;
  • 남웅식 (인하대학교 조선해양공학과)
  • Received : 2013.01.18
  • Accepted : 2013.04.19
  • Published : 2013.04.30
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Abstract

Stress triaxiality is recognized as one of the most important factors for predicting the failure strain of ductile metals. This study dealt with the effect of the average stress triaxiality on the failure strain of a typical low-temperature high-strength marine structural steel, EH36. Tensile tests were carried out on flat specimens with different notches, from relatively smooth to very sharp levels. Numerical simulations of each specimen were performed by using ABAQUS. The failure initiation points in numerical simulations were identified from a comparison of the engineering stress vs. strain curves obtained from experiments with simulated ones. The failure strain curves for various dimensionless critical energy levels were established in the average stress triaxiality domain and compared with the identified failure strain points. It was observed that most of the failure initiation points were approximated with a 100% dimensionless critical energy curve. It was concluded that the failure strains were well expressed as a function of the average stress triaxiality.

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References

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