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The fundamental features of existing viscoplasticity theories in relation to different experiments with finite inelastic strains and strain rates are highlighted. Such theories, which are essentially phenomenological, have to obey general constitutive principles of continuum mechanics such as objectivity, material symmetry, determinism and local action. Additional features of inelastic rate-dependent behaviour such as material symmetry change, directionality effects, yield surface existence, isotropic and anisotropic damage, creep, cycling, recovery and softening have to be taken into account, to meet cumbersome uniaxial and limited multiaxial experimental data. Directionality effects are particularly considered here. Finally, the role of a correct deformation geometry and irreversible thermodynamics, which are of great importance for inelastic deformation processes, is discussed. Existing viscoplasticity models are compared and a programme of biaxial experiments on cruciform specimens is presented.

Additional information

Authors: MICUNOVIC M, Svetozar University, Kragujevac (YU);ALBERTINI C, JRC Ispra Estab. (IT);MONTAGNANI M, JRC Ispra Estab. (IT)
Bibliographic Reference: Paper presented: 10th International Conference on Structural Mechanics in Reactor Technology, Anaheim Ca (US), Aug. 14-18, 1989
Availability: Available from (1) as Paper EN 34811 ORA
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