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Forming Limit Diagrams of Strain-rate-dependent Sheet Metals by M. Jie; C.H. Cheng; L.C. Chan; C.L. Chow is a Engineering article available to read on EtoBox.

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This paper presents a predictive model of localized necking for strain-rate-dependent sheet metals. This is achieved by the development of a modified vertex theory for use as a localized necking criterion. The vertex theory is von Mises based and isotropic. The study is motivated by the apparent discrepancies between the measured forming limit diagrams (FLDs) of strain-rate-dependent sheet metals and those predicted using the conventional vertex theory. The modified theory considers the rate-dependent power-hardening material rule. A novel form of quasi-linear stress-strain relation based on the powerhardening rule is analytically derived to model the constitute behavior of the rate-dependent material. The localized necking criterion of the sheet metals is based on the vertex theory, which assumes that localized necking occurs simultaneously with the initiation of a vertex on the yield surface. The stress-strain relation of rate-dependent material is coupled into the vertex theory to deduce the critical conditions for localized necking on both sides of the FLD. Numerical results indicate that the forming limits of rate-dependent sheet metals follow quite different rule as that for

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Author

M. Jie; C.H. Cheng; L.C. Chan; C.L. Chow

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0020-7403)

Published

2009

Language

EN

Field

Engineering (Physical Sciences)