An algorithm for localised and diffuse necking analysis Online publication date: Fri, 28-Dec-2007
by Juri Majak, Meelis Pohlak, Rein Kuttner
International Journal of Computational Materials Science and Surface Engineering (IJCMSSE), Vol. 1, No. 4, 2007
Abstract: An analysis of localised and diffuse necking in orthotropic sheet metals is performed. Numerical algorithm covering different yield criteria and strain hardening laws is developed. The numerical algorithm proposed is based on plastic instability criterion derived in tensor notation. The capabilities of the instability criteria derived are improved using different anisotropic yield criteria and strain hardening laws. The obtained results are validated against experimental test results and compared with the results available in literature. The material parameters identification procedure for advanced yield criterion BBC2003 is treated. The Computer Algebra Systems (CAS-es) method is employed for material parameters identification. Simplicity and low computational cost of numerical analysis is achieved by the use of Hill and Swift instability conditions and empirical stress-strain relation. [Received 7 March 2007; Accepted 10 July 2007]
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