How to Combine the Parameters of the Yield Criteria and the Hardening Law

Abstract:

The numerical simulation of sheet metal forming processes needs the accurate identification of the material parameters, for a given constitutive model. This identification can follow different methodologies and different sets of experimental data can be used, which lead to distinct sets of material parameters. In order to accurately compare the results of several methodologies, it is necessary to guarantee uniformity of their presentation. In this work, the correspondence between sets of parameters of the Hill’48 criterion is explored. The meaning of the “isotropic values” of the parameters associated with the out-of-plane stresses components is discussed and a required condition is proposed, in order to properly compare numerical simulation results obtained by using different input sets of constitutive parameters, identified by different procedures. Finite element simulations of complex shaped forming process, involving strain-path changes, are carried out in order to support the analysis.

• Periodical: Key Engineering Materials (Volumes 554-557)
• Pages: 1195-1202
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.554-557.1195
• Online since: June 2013
• Authors: Pedro Prates, Marta C. Oliveira, Nataliya A. Sakharova, José Valdemar Fernandes
• Keywords: Constitutive Law Parameters, Hardening Law, Yield Criterion

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