Generalization of a uniaxial elasto-plastic material model based on the Prandtl-Reuss theory. (English) Zbl 07776908
Summary: The present paper introduces a material model following the Prandtl-Reuss theory of time-independent elasto-plasticity. Applying a hypo-elastic relation a material model for uniaxial tension/compression is derived which is completely based on scalar kinematics. Combined isotropic and kinematic hardening is provided in terms of nonlinear formulations showing saturation. The proof of thermodynamic consistency is supplied. Further, the model is generalized by the concept of representative directions and implemented for finite element application, so that arbitrary spatial deformation processes can be simulated. Especially, the elastic response of the model is investigated. Comparative simulations give evidence that spurious phenomena such as shear oscillation and numerically induced ratcheting are absent for the presented generalized material model. Distinct distortional hardening is obtained after generalization describing metal plasticity adequately. Finally the model is extended to show tension/compression anisotropy.
{© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim}
{© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim}
MSC:
| 74Cxx | Plastic materials, materials of stress-rate and internal-variable type |
| 74Axx | Generalities, axiomatics, foundations of continuum mechanics of solids |
| 74Bxx | Elastic materials |
Keywords:
distortional hardening; hypo-elasticity; metal plasticity; Prandtl-Reuss equations; yield surface evolutionReferences:
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