Formulation and Verification of a Concrete Model with Strong Coupling between Isotropic Damage and Elastoplasticity and Comparison to a Weak Coupling Model

Taqieddin, Ziad N.; Voyiadjis, George Z.; Almasri, Amin H.

doi:10.1061/(asce)em.1943-7889.0000344

Cited by 17 publications

(24 citation statements)

References 39 publications

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“…More detailed information is available in [25,26]. The similar material model was successfully verified and applied in former analyses [27][28][29][30][31][32]. An adequate interaction between concrete matrix and steel fibres has been enabled by insertion of randomly distributed "cloud" of finite elements of fibres into concrete volume of solid finite elements.…”

Section: Numerical Simulationmentioning

confidence: 99%

Static And Dynamic Characteristics Of Waste Ceramic Aggregate Fibre Reinforced Concrete

Cichocki¹,

Domski²,

Katzer³

et al. 2015

Transactions of the VŠB – Technical University of Ostrava, Civil Engineering Series.

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There are multiple obstacles associated both with technology and properties of waste ceramic aggregate concrete preventing its wide production and application. In the research programme these limitations were addressed through utilizing steel fibre reinforcement and the phenomenon of internal curing. After laboratory tests of mechanical properties a numerical analysis of composites in question was conducted.

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Section: Numerical Simulationmentioning

confidence: 99%

Static And Dynamic Characteristics Of Waste Ceramic Aggregate Fibre Reinforced Concrete

Cichocki¹,

Domski²,

Katzer³

et al. 2015

Transactions of the VŠB – Technical University of Ostrava, Civil Engineering Series.

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“…In the coupled EPD models, the damage variables appear in the elastic as well as the plastic constitutive equations and evolution laws ( [13][14][15][16][17][18]; among others). These models exhibit complex yield criteria, evolution laws, implementation procedures, and algorithms; however, they are capable of simulating specific material behaviors that are usually ignored in simpler models.…”

Section: Introductionmentioning

confidence: 99%

Studying the effect of a hydrostatic stress/strain reduction factor on damage mechanics of concrete materials

Taqieddin

Voyiadjis

2013

Journal of the Mechanical Behavior of Materials

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In the non-linear finite element analysis (NFEA) of concrete materials, continuum damage mechanics (CDM) provides a powerful framework for the derivation of constitutive models capable of describing the mechanical behavior of such materials. The internal state variables of CDM can be introduced to the elastic analysis of concrete to form elastic-damage models (no inelastic strains), or to the elastic-plastic analysis in order to form coupled/ uncoupled elastic-plastic-damage models. Experimental evidence that is well documented in literature shows that the susceptibility of concrete to damage and failure is distinguished under deviatoric loading from that corresponding to hydrostatic loading. A reduction factor is usually introduced into a CDM model to reduce the susceptibility of concrete to hydrostatic stresses/strains. In this work, the effect of a hydrostatic stress/strain reduction factor on the performances of two NFEA concrete models will be studied. These two (independently published) models did not provide any results showing such effect. One of these two models is an elastic-damage model, whereas the other is an uncoupled elastic-plastic-damage model. Simulations and comparisons are carried out between the performances of the two models under uniaxial tensile and compressive loading conditions. Simulations are also provided for the uncoupled elastic-plastic-damage model under the following additional loading conditions: biaxial tension and biaxial compression, uniaxial cyclic loading, and varying ratios of triaxial compressive loadings. These simulations clearly show the effect of the reduction factor on the numerically depicted behaviors of concrete materials. To have rational comparisons, the hydrostatic stress reduction factor applied to each model is chosen to be a function of the internal state variables common to both models. Therefore, once the two models are calibrated to simulate the experimental behaviors, their corresponding reduction factors are readily available at every increment of the iterative NFEA procedures.

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“…The other type of CPDMs is opposite of the above. In these models, the true stress appears in the plastic process, which clearly couples plasticity to damage [6,10,11,[15][16][17]. However, considering the influence of damage on plastic flow, it is difficult to develop a plastic yield function that can be used to describe the plastic deformation and damage growth of concrete simultaneously.…”

Section: Introductionmentioning

confidence: 99%

“…However, considering the influence of damage on plastic flow, it is difficult to develop a plastic yield function that can be used to describe the plastic deformation and damage growth of concrete simultaneously. Taqieddin et al [17] suggested that a damage-sensitive plastic yield function should be introduced in terms of true stress configuration. Even if several types of expressions for the plastic yield function written in terms of the effective stress have been successfully applied to model some of the typical nonlinearities of concrete (such as the volumetric dilation and strength increase under multidimensional compression), they cannot be directly used in the true stress space.…”

Section: Introductionmentioning

confidence: 99%

“…Two reduction factors are introduced into the tensile and the compressive hardening functions to consider the influence of the tensile and compressive damage mechanisms on the plastic flow, respectively. Taqieddin et al [17] proposed a double scalar damage-plasticity model for concrete based on the hypothesis of strain energy equivalence. The model incorporates a plastic yield function written in terms of the true stress.…”

Section: Introductionmentioning

confidence: 99%

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A Coupled Plastic Damage Model for Concrete considering the Effect of Damage on Plastic Flow

Zhou

Cheng

2015

Mathematical Problems in Engineering

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A coupled plastic damage model with two damage scalars is proposed to describe the nonlinear features of concrete. The constitutive formulations are developed by assuming that damage can be represented effectively in the material compliance tensor. Damage evolution law and plastic damage coupling are described using the framework of irreversible thermodynamics. The plasticity part is developed without using the effective stress concept. A plastic yield function based on the true stress is adopted with two hardening functions, one for tensile loading history and the other for compressive loading history. To couple the damage to the plasticity, the damage parameters are introduced into the plastic yield function by considering a reduction of the plastic hardening rate. The specific reduction factor is then deduced from the compliance tensor of the damaged material. Finally, the proposed model is applied to plain concrete. Comparison between the experimental data and the numerical simulations shows that the proposed model is able to describe the main features of the mechanical performances observed in concrete material under uniaxial, biaxial, and cyclic loadings.

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Formulation and Verification of a Concrete Model with Strong Coupling between Isotropic Damage and Elastoplasticity and Comparison to a Weak Coupling Model

Cited by 17 publications

References 39 publications

Static And Dynamic Characteristics Of Waste Ceramic Aggregate Fibre Reinforced Concrete

Static And Dynamic Characteristics Of Waste Ceramic Aggregate Fibre Reinforced Concrete

Studying the effect of a hydrostatic stress/strain reduction factor on damage mechanics of concrete materials

A Coupled Plastic Damage Model for Concrete considering the Effect of Damage on Plastic Flow

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