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논문 기본 정보

자료유형
학술대회자료
저자정보
Christian Held (HochschulInstitute Neckarsulm) Mathias Liewald (Universität Stuttgart) Ralf Schleich (Universität Stuttgart) Manfred Sindel (AUDI AG)
저널정보
한국소성·가공학회 기타자료 NUMIFORM 2010
발행연도
2010.6
수록면
910 - 918 (9page)

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The use of lightweight materials offers substantial strength and weight advantages in car body design. Unfortunately such kinds of sheet material are more susceptible to wrinkling, spring back and fracture during press shop operations. For characterization of capability of sheet material dedicated to deep drawing processes in the automotive industry, mainly Forming Limit Diagrams (FLD) are used. However, new investigations at the Institute for Metal Forming Technology have shown that High Strength Steel Sheet Material and Aluminum Alloys show increased formability in case of bending loads are superposed to stretching loads. Likewise, by superposing shearing on in plane uniaxial or biaxial tension formability changes because of materials crystallographic texture. Such mixed stress and strain conditions including bending and shearing effects can occur in deep-drawing processes of complex car body parts as well as subsequent forming operations like flanging. But changes in formability cannot be described by using the conventional FLC. Hence, for purpose of improvement of failure prediction in numerical simulation codes significant failure criteria for these strain conditions are missing. Considering such aspects in defining suitable failure criteria which is easy to implement into FEA a new semi-empirical model has been developed considering the effect of bending and shearing in sheet metals formability. This failure criterion consists of the combination of the so called cFLC (combined Forming Limit Curve), which considers superposed bending load conditions and the SFLC (Shear Forming Limit Curve), which again includes the effect of shearing on sheet metal’s formability.

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Abstract
INTRODUCTION
DETERMINATION OF MATERIAL’S FORMABILITY UNDER CONSIDERATION OFA SUPERPOSED BENDING LOAD
DETERMINATION OF MATERIAL’S FORMABILITY UNDER CONSIDERATION OFSUPERPOSED SHEARING LOAD
COMBINATION OF PRESENTED CONCEPTS TO ENHANCED SEMI-EMPIRICALMODEL FOR FORMING LIMIT PREDICTION
NEW MATERIAL TESTING CONCEPT FOR INVESTIGATION OF MATERIALBEHAVIOUR UNDER SUPERPOSED BENDING AND SHEAR STRESS CONDITIONS
CONCLUSIONS
OUTLOOK
REFERENCES

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