Publisher : The Korean Society for Technology of Plasticity
DOI : 10.5228/KSTP.24.5.348
Title & Authors
The Improvement of Formability using the Polar-coordinate FLD with Strain Path Independence Bae, M.K.; Hong, S.H.; Choi, K.Y.; Yoon, J.W.; Kim, Y.S.;
The PEPS(Polar-coordinated Effective Plastic Strain) FLD(Forming Limit Diagram), a new type of FLD based on a polar representation of the EPS(Effective Plastic Strain), appears to be an effective solution to the problem of non-linear strain path effects. This method has the advantages of the familiar strain-based diagram for linear loading, but without the strain-hardening limitations of the stress-based diagram, or non-intuitive aspects of alternate Cartesian diagrams based on effective plastic strain. In the current study, the PEPS FLD was applied to the development process of an aluminum automobile-body panel, including the necking or crack prediction, die design, and die modification. As a result, the PEPS FLD provided improved formability of aluminum sheet as compared to deriving the potential formability with non-linearity.