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논문 기본 정보

자료유형
학술대회자료
저자정보
Ji Hoon Kim (Korea Institute of Materials Science) Ji Hyun Sung (Ohio State University) D. K. Matlock (Colorado School of Mines) Daeyong Kim (Korea Institute of Materials Science) R. H. Wagoner (Ohio State University)
저널정보
한국소성·가공학회 기타자료 NUMIFORM 2010
발행연도
2010.6
수록면
63 - 70 (8page)

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초록· 키워드

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Dual-phase (DP) steels are being used increasingly to make automotive panels because of their advantageous combinations of high ductility (for forming) and high strength (for service). However, their adoption has been limited because of failures during die tryout that are unpredicted by the usual methods of finite element modeling and forming limit diagrams. The failures, often called “shear failures” occur at regions of high curvature (low R/t) where sheet of thickness t is drawn over a tool radius R. Recent work revealed that the type of failure and the formability of DP steels depend not only on R/t, but also on strain rate, an effect derived from the propensity of these steels to locally heat in areas of high strain when strain rates are sufficiently high to limit heat transfer. The formability is reduced significantly by the thermal effect for rates greater than approximately 0.1/s. This result explains at least partially why forming limit diagrams, which are measured quasi-statically (and thus isothermally) do not reflect the behavior of DP steels formed industrially (at typical strain rates of approximately 10/s). In order to apply laboratory test results of draw-bend formability to industrial forming operations, the inputs to commercial finite element codes (constitutive equations, forming limits) must be adapted to the reality of the material (DP steel) and underlying physics (thermal effects on constitutive behavior). Toward this end, two procedures have been developed and tested, one numerical and one analytical. Together they predict similar forming limits and provide a path for understanding the applied formability of DP steels.

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Abstract
INTRODUCTION
H/V CONSTITUTIVE MODEL
ADIABATIC CONSTITUTIVE EQUATION
THERMO-MECHANICAL FINITE ELEMENT SIMULATION
PLANE STRAIN FRACTURE CRITERIA
CONCLUSIONS
REFERENCES

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