On the use of stress-based forming limit curve for forming and fracture

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The forming limit curve (FLC) or diagram illustrates the major and minor strains expected on the surface of a deforming sheet material at the onset of local necking. Since determining forming limits experimentally is costly and time consuming, it is desirable to develop a theoretical model. In this work, the equal biaxial strain hardening behavior and the anisotropic yield function Yld2000-2d (Barlat et al. [4]) are used as input to the model that calculates forming limits according to the Marciniak-Kuczynski (M-K) imperfection theory for strain localization. The resultant strain-based forming limit curves are mapped to stress-based FLC in stress space. The mapping procedure from strain space to stress space was explained in detail for a general nonquadratic yield function. A solution to the challenge of assessing formability in stress space is proposed by using a single parameter which indicates the necking based on plastic state variables. The necking parameter was utilized for the simulation including the forming of an automotive part and the fracture in a beverage can end.
Publisher
The Japan Society for Technology of Plasticity
Issue Date
2008-09
Language
ENG
Citation

9th International Conference on Technology of Plasticity, ICTP 2008, pp.708 - 722

URI
http://hdl.handle.net/10203/204710
Appears in Collection
ME-Conference Papers(학술회의논문)
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