Transactions of Materials and Heat Treatment

Title：Diffused necking limit predicted by two different plastic instability theories

Authors： Xia Meng Gu Su′nan Liu Haiting

Unit： Shanghai Jiao Tong University Southeast University

KeyWords： forming limit curve diffused necking constitutive model plastic instability theories

ClassificationCode：TG381

year,vol(issue):pagenumber：2015,40(9):128-133

Abstract：

The theoretical calculation of forming limit curve of metals was carried out by a damaged elastic-plastic constitutive model according to its anisotropy and tiny microdamage combining with the Hills general bifurcation theory and Swifts maximum force theory. Calculation with Hills theory was realized by Abaqus, while analytical formulas of major and minor limit strain under four different hardening laws were found by Swift's theory. Results show that under the condition of plane stress and large deformation, the difference of ultimate strains corresponding to diffused necking predicted by Hills theory and Swift's theory respectively is less than 2%. In practice, when it is difficult to calculate by Swifts theory, it can be replaced by Hills theory.

Funds：

夏梦（1990-），女，硕士研究生

Reference：

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