Abstract
In order to use the Abaqus Concrete Damaged Plasticity (CDP) material model in simulations of reinforced concrete structures, one has to understand the effect of various parameters of the material model. Although most of the material parameters can be determined from standard concrete tests, some parameters need more advanced tests to be determined. In impact simulations, one often has only limited material data available, and it makes therefore sense to study the parameter sensitivity of the material model in order to fix realistic parameter values. In this paper, the sensitivity of the simulation response with respect to two modelparameters is studied: the dilation angle and the tensile to compressive meridian ratio. The sensitivity study is performed in three simple but representative stress states: the uniaxial tension state, the confined uniaxial compressive state and the pure shear state. Finally, it is discussed how these simple stress states relate to the element removal criteria, which is necessary in simulations involving fragmentation.
Highlights
About of the Abaqus CDP model The Abaqus Concrete Damaged Plasticity (CDP) material model, as documented in the Abaqus user and theory manuals, [1], is based on two damage-plasticity theory building blocks
The Abaqus CDP model can be used in its standard form, by providing in the model definition the two hardening curves and a few input parameters that control the shape of the yield surface and the flow potential
This paper aims to “open the black box” of the CDP model in order to investigate the behavior in depth on very simple, but representative, stress states
Summary
About of the Abaqus CDP model The Abaqus Concrete Damaged Plasticity (CDP) material model, as documented in the Abaqus user and theory manuals, [1], is based on two damage-plasticity theory building blocks. The second building block is a bi-isotropic strain hardening behavior, which depends on the evolution of two scalar internal hardening variables: the compressive and tensile equivalent plastic strains. The yield surface and the non-associative flow potential that is characteristic to the CDP model was first proposed by Lubliner and his co-workers in the so called “Barcelona” model, [2]. The Abaqus CDP model can be used in its standard form, by providing in the model definition the two hardening curves and a few input parameters that control the shape of the yield surface and the flow potential. There is a possibility in the CDP model to apply user defined field variable dependency on any of the material parameters. It is worthwhile to note that especially in hard missile impact simulations these field variable dependencies of compressive and tensile hardening are necessary, [9, 10]
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