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금속 벌크소재의 성형한계 정의를 위한 삼축응력선도 도출 연구 KCI 등재
A Study on Deriving Triaxial Stress Curves for Defining the Forming Limits of Bulk Metal Materials
pp.852-858
The method of evaluating the forming limit of sheet metal is using the forming limit diagram(FLD), and the test method for measuring forming limit curve(FLC) is ISO standardized. On the other hand, in the case of metal bulk materials, it was confirmed that the forming limit was defined by using various predictive models based on the ductile fracture theory. However it did not show a constant forming limit (limit damage value) depending on the shape of the specimen. Therefore, a study was conducted on the derivation of the triaxial stress curve to predict the fracture of the material for various stress triaxiality, not the existing limit damage value.
1. 서 론
2. 링 확관실험
2.1 시험편 및 금형 제작
2.2 링 확관 실험결과
3. 임계손상 값 도출
3.1 소재 물성 평가
3.2 공정해석 및 결과
4. 응력삼축선도
5. 곁 론
References
