Naslov
A new free-energy based model of the kinematic hardening in large strain elastoplasticity

Autori
Karšaj, Igor ; Sansour, Carlo ; Sorić, Jurica

Izvornik
Computer modeling in engineering & sciences (1526-1492) 8 (2005), 1; 45-59

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
large strains ; elastoplasticity ; free energy ; kinematic hardening ; isotropic hardening

Sažetak
In this paper, a free energy-based formulation incorporating the effect of kinematic hardening is proposed. The formulation is able to reproduce symmetric expressions for the back stress while incorporating the multiplicative decomposition of the deformation gradient. Kinematic hardening is combined with isotropic hardening where an associative flow rule and von Mises yield criterion are applied. An accurate and trivial wise objective integration algorithm employing the exponential map is developed. In order to ensure a high convergence rate in the global iteration approach, an algorithmic tangent operator is derived. The computational algorithm is implemented and applied to a shell finite element which allows the use of complete three- dimensional constitutive laws. Robustness and efficiency of the proposed algorithm are demonstrated by numerical examples.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

POVEZANOST RADA