The tensile damage parameter, dt is defined as the ratio of the cracking strain to the total strain. Similarly, the compressive damage parameter, dc is defined as the ratio between the inelastic strain and total strain. In that case won't the expression (4) and (2) in the attached paper always evaluates to zero?
Most of the figures and explanation have been taken from the Abaqus documentation.
You please prefer the original document available free online. It has also be explained in this paper:
http://www.sciencedirect.com/science/article/pii/S089069551200137X
If you deduct the total strain from the elastic strain(the strain at the point which concrete start to show nonlinear behaviour),then you can assume it as plastic strain for ABAQUS input.
The Concrete Damaged Plasticity Model (ABAQUS command: *CONCRETE DAMAGED PLASTICITY) uses the concept of isotropic damaged elasticity in combination with isotropic tensile and compressive plasticity to represent the inelastic behaviour of concrete. In contrast to the Brittle Cracking Model it allows the definition of strain hardening in compression and can be defined to be sensitive to the straining rate, which resembles the behaviour of concrete more realistically. The Concrete Damaged Plasticity Model is designed for applications in which concrete is subject to cyclic loading with alternating tension compression loading, e.g. seismic problems. The model allows stiffness recovery during cyclic loading reversals. In contrast to the Brittle Cracking Model the Concrete Damaged Plasticity Model does not contain a failure criterion and thus does not allow the removal of elements during the analyses. This makes it difficult to model missile impact phenomena where perforation of the missile through the reinforced concrete slab is most likely, i.e. high initial missile velocity and weak reinforcement. On the other hand the Concrete Damaged Plasticity Model may be used in conjunction with adaptive meshing (ABAQUS command: *ADAPTIVE MESH). Adaptive meshing means that the impacted zone of the concrete slab is re-meshed regularly during the analyses in order to avoid heavy distortion of the elements. This allows completion of the analyses even to relatively high deformation rates.
There is one parameter named 'Viscosity' in Damaged Plasticity Model. I am unable to find any theory related to this parameter as ABAQUS theory manual talk only the mathematical aspect. Please tell me the theory behind this term.
Could you please explain how to conjunct with adaptive meshing? I mean, where is the option of adaptive meshing in ABAQUS?
Unnikrishnan Bm .... Please check references below.. hope it will be helpful for you…
Regards…
http://framcos.org/FraMCoS-9/Full-Papers/6.pdf
http://www.i-asem.org/publication_conf/asem15/3.CTCS15/1w/W1D.1.AWinnicki.CAC.pdf
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