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Ductile Fracture Predictions of High Strength Steel (EH36) using Linear and Non-Linear Damage Evolution Models

선형 및 비선형 손상 발전 모델을 이용한 고장력강(EH36)의 연성 파단 예측

  • Park, Sung-Ju (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Park, Byoungjae (Korea Research Institute of Ships and Ocean Engineering) ;
  • Choung, Joonmo (Department of Naval Architecture and Ocean Engineering, Inha University)
  • 박성주 (인하대학교 조선해양공학과) ;
  • 박병재 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 정준모 (인하대학교 조선해양공학과)
  • Received : 2017.06.24
  • Accepted : 2017.08.18
  • Published : 2017.08.31

Abstract

A study of the damage evolution laws for ductile materials was carried out to predict the ductile fracture behavior of a marine structural steel (EH36). We conducted proportional and non-proportional stress tests in the experiments. The existing 3-D fracture strain surface was newly calibrated using two fracture parameters: the average stress triaxiality and average normalized load angle taken from the proportional tests. Linear and non-linear damage evolution models were taken into account in this study. A damage exponent of 3.0 for the non-linear damage model was determined based on a simple optimization technique, for which proportional and non-proportional stress tests were simultaneously used. We verified the validity of the three fracture models: the newly calibrated fracture strain model, linear damage evolution model, and non-linear damage evolution model for the tensile tests of the asymmetric notch specimens. Because the stress evolution pattern for the verification tests remained at mode I in terms of the linear elastic fracture mechanics, the three models did not show significant differences in their fracture initiation predictions.

Keywords

Average stress triaxiality;Average normalized lode angle;Non-proportional stress;Damage evolution;Ductile fracture;Loading path

Acknowledgement

Grant : 해양플랜트 의 사고한계상태기반 구조손상도평가 핵심기술 개발, 해양에너지 융복합 인력양성

Supported by : 선박해양플랜트연구소, 한국해양과학기술진흥원

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