Proceedings of the Korean Society for Technology of Plasticity Conference (한국소성가공학회:학술대회논문집)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Formability Evaluation of Advanced High-strength Steel Sheets in Role Expansion Based on Combined Continuum-Fracture Mechanics

복합 연속체 파괴 역학에 기초한 초고강도강 판재의 구멍 넓힘 시험 성형성 평가

  • Ma, N. ;
  • Park, T. ;
  • Kim, D. ;
  • Yoo, D. ;
  • Kim, Chong-Min (General Motors R&D Center) ;
  • Chung, K.
  • 마닝 (서울대학교 재료공학부) ;
  • 박태준 (서울대학교 재료공학부) ;
  • 김돈건 (서울대학교 재료공학부) ;
  • 유동훈 (서울대학교 재료공학부) ;
  • ;
  • 정관수 (서울대학교 재료공학부)
  • Published : 2009.10.08
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Abstract

In order to predict failure behavior of advanced high-strength steel sheets (AHSS) in hole expansion tests, damage model was developed considering surface condition sensitivity (with specimens prepared by milling and punching: 340R, TRIP590, TWIP940). To account for the micro-damage initiation and evolution as well as macro-crack formation, the stress triaxiality dependent fracture criterion and rate-dependent hardening and ultimate softening behavior were characterized by performing numerical simulations and experiments for the simple tension and V-notch tests. The developed damage model and the characterized mechanical property were incorporated into the FE program ABAQUS/Explicit to perform hole expansion simulations, which showed good agreement with experiments.

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