Proceedings of the Korean Society for Technology of Plasticity Conference (한국소성가공학회:학술대회논문집)
- 2009.10a
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- Pages.198-201
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- 2009
Develop of Strain Measurement and Characterization of Mechanical Behavior for Hot Press Forming
열간프레스성형에서의 변형 측정장치 개발 및 기계적 거동의 물성화
- Yoo, Dong-Hoon ;
- Seok, Dong-Yoon ;
- Kim, Don-Gun ;
- Ahn, Kang-Hwan ;
- Son, Hyun-Sung ;
- Kim, Gyo-Sung ;
- Chung, Kwan-Soo
- 유동훈 (서울대학교 재료공학부) ;
- 석동윤 (서울대학교 재료공학부) ;
- 김돈건 (서울대학교 재료공학부) ;
- 안강환 (서울대학교 재료공학부) ;
- 손현성 (POSCO 기술연구소) ;
- 김교성 (POSCO 기술연구소) ;
- 정관수 (서울대학교 재료공학부)
- Published : 2009.10.08
Abstract
As a way to improve the safety of automotives and to reduce the weight of vehicles, new forming technologies and advanced materials are in high demand in the automotive industry. However, the advanced strength steel has inferior formability and large springback. In order to overcome such drawbacks, the hot press forming process (HPF) has been being applied for forming of automotive sheet parts. In this work, new equipment was suggested to measure unlimited displacement range compared to previous one which was able to measure only up to 10mm displacement range. The external extensometer connected with grips by wire was applied to equipment so that total strain range was measured up to failure also in high temperature. And the finite element analysis was conducted to characterize the mechanical properties of the HPF steel. Finally, the flow curves were represented by utilizing the Johnson-Cook type equation both in uniform and post-uniform deformation regions.