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논문 기본 정보

자료유형
학술대회자료
저자정보
Meng Luo (Massachusetts Institute of Technology) Yaning Li (Massachusetts Institute of Technology) Joerg Gerlach (ThyssenKrupp Steel Europe AG) Tomasz Wierzbicki (Massachusetts Institute of Technology)
저널정보
한국소성·가공학회 기타자료 NUMIFORM 2010
발행연도
2010.6
수록면
464 - 472 (9page)

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초록· 키워드

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Advanced High Strength Steels (AHSS) draws enormous attentions in automotive industry because it has great potential in reducing weight and improving fuel efficiency. Nonetheless, their relatively low formability also causes many problems in manufacturing processes, such as shear-induced fracture during deep drawing or stamping. This type of fracture could not be predicted using traditional necking-based Forming Limit Diagram (FLD), which is commonly used by the forming community. In the present paper, a recently developed Modified Mohr-Coulomb (MMC)[1] ductile fracture model is employed to make up the deficiency of FLD. In the limiting case of plane stress, the MMC fracture locus consists of four branches when represented on the plane of the equivalent strain to fracture and the stress triaxiality. A transformation of above 2D fracture locus to the space of principal strains was performed which revealed the existence of two new branches not known before. The existence of those branches explains the formation of shear-induced fracture. As an illustration of this new approach, initiation and propagation of cracks in a series of deep drawing tests is predicted and compared with the experimental observations. It was shown that the location of fracture as well as the magnitude of punch travel corresponding to first fracture was correctly predicted by MMC fracture model for both square and circular punch cases.

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Abstract
INTRODUCTION
DEEP DRAWING TESTS
MATERIAL MODELING
NUMERICAL MODELING
RESULTS AND DISCUSSIONS
CONCLUSIONS
REFERENCES

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