Gurson-type elastic-plastic damage model based on strain-rate plastic potential

The most widely used multi-axial concrete models including elastic-plastic model and elastic plastic damage model are expounded and it is recognized that the elastic plastic damage model is more reasonable to reflect nonlinear characteristic of concrete. The development and application of elastic plastic damage model is comprehensively appraised and a practical elastic plastic damage constitutive model is established. Finally the dynamic trend of constitutive model of concrete development is introduced.

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A Coupled Elastic-Plastic Damage Model for Rock Material

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.488-489.799 ◽

2014 ◽

Vol 488-489 ◽

pp. 799-802

Author(s):

Hong Jie Chen ◽

Wei Ya Xu ◽

Ru Bin Wang ◽

Wei Wang

Keyword(s):

Damage Mechanics ◽

Damage Model ◽

Confining Pressure ◽

Damage Mechanism ◽

Coupling Model ◽

Internal Variable ◽

Elastic Plastic ◽

Softening Behavior ◽

Plastic Damage ◽

Damage Constitutive Model

With complex mechanics character and under the action of compression and tension in tri-direction, rock will show coupled plastic-damage mechanism as its basic character. Phenomenological coupled elastic-plastic-damage constitutive model with internal variable is proposed based on thermal mechanics theory, elastic law and macro damage mechanics. Numerical experiments on this model and analyze the model character. The result shows that the coupling model could realize rocks softening behavior brought about by damage and strength enlargement caused by confining pressure increasing.

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A Practical Elastic Plastic Damage Model for Concrete

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.243-249.313 ◽

2011 ◽

Vol 243-249 ◽

pp. 313-318 ◽

Cited By ~ 3

Author(s):

Hu Qi ◽

Yun Gui Li ◽

Xi Lin Lu

Keyword(s):

Stress State ◽

Damage Mechanics ◽

Hydrostatic Stress ◽

Axial Stress ◽

Stress Component ◽

Damage Model ◽

Continuum Damage Mechanics ◽

Deviatoric Stress ◽

Elastic Plastic ◽

Plastic Damage

In this paper, an elastic plastic damage model is presented based on the combined use of elastic plastic constitutive equations along with continuum damage mechanics. A tensile and a compressive damage variable are adopted to describe the different responses of concrete under tension and compression, respectively. The Helmholtz Free Energy is decomposed into hydrostatic stress component and deviatoric stress components. The hydrostatic stress component is neglected and the deviatoric stress component is amended according to stress state, resulting in a more accurate description of the concrete’s response under multi-axial stress state. Finally, through several numerical simulations it is proved that the proposed model has the capability of simulating typical nonlinear performances of concrete material.

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