Proceedings of the Korean Society for Technology of Plasticity Conference (한국소성가공학회:학술대회논문집)
- 2009.10a
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- Pages.227-230
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- 2009
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
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.
Keywords
- AHSS;
- Hole Expansion Ratio (HER);
- Damage Model;
- Stress Triaxiality Fracture Criterion;
- Rate-dependent hardening;
- 340R;
- TRIP590;
- TWIP940