On the constitutive modeling of dual-phase steels at finite strains: a generalized plasticity based approach

Soldatos, Dimitris; Triantafyllou, Savvas P.; Chatzi, Eleni N.

Abstract

In this work we propose a general theoretic framework for the derivation of constitutive equations for dual-phase steels, undergoing continuum finite deformation. The proposed framework is based on the generalized plasticity theory and comprises the following three basic characteristics:

1.A multiplicative decomposition of the deformation gradient into elastic and plastic parts.

2.A hyperelastic constitutive equation

3.A general formulation of the theory which prescribes only the number and the nature of the internal variables, while it leaves their evolution laws unspecified. Due to this generality several different loading functions, flow rules and hardening laws can be analyzed within the proposed framework by leaving its basic structure essentially unaltered.

As an application, a rather simple material model, which comprises a von-Mises loading function, an associative flow rule and a non-linear kinematic hardening law, is proposed. The ability of the model in simulating simplified representation of the experimentally observed behaviour is tested by two representative numerical examples.

Citation

Soldatos, D., Triantafyllou, S. P., & Chatzi, E. N. (2015). On the constitutive modeling of dual-phase steels at finite strains: a generalized plasticity based approach.

• Conference Name: Forming Technology Forum 2015
• End Date: Jun 30, 2015
• Acceptance Date: Jun 16, 2015
• Publication Date: Jun 30, 2015
• Deposit Date: Jul 5, 2016
• Publicly Available Date: Jul 5, 2016
• Peer Reviewed: Peer Reviewed
• Keywords: Dual-phase steels, Generalized plasticity, Finite strains
• Public URL: https://nottingham-repository.worktribe.com/output/753532
• Related Public URLs: http://www.ivp.ethz.ch/en/news-and-events/forming-technology-forum-2015.html; http://e-citations.ethbib.ethz.ch/view/pub:174151