In Concrete Damaged Plasticity property in ABAQUS, we input 5 properties like Viscosity, Dilation Angle, Eccentricity, K and fb/fc. There are 2 more optional parameters - tension recovery and compression recovery.
Could someone help on the background to these values. How should we change these values for different models?
Dear Jayaprakash,
in the concrete damaged plasticity (CDP) model, the mentioned 7 governing parameters define the constitutive law/ relation as follows:
1. The viscosity parameter is generally used when rate dependent analysis is conducted.
2. The dilation angle defines amount of plastic volumetric strain induced in plastic shear.
3. The flow potential eccentricity in the stress-strain relation shows the rate at which the function approaches asymptote in the hyperbolic surface of plastic potential in meridional plane.
4. The K parameter controls how the yield surface will shape like.
5. The ratio, fb/fc, typically exhibits multi-axial to uniaxial material strengths.
6 and 7. The tension and compression recovery parameters are typically defined when reversal of stresses is possible and material does show peculiar behavior in its stiffness changes when tensile and compressive stresses are reversed (stiffness degradation).
Hope this helps. You may wish to refer some pertinent text on this matter from:
"Comparative Performance of Composite Sandwich Panels and Non-Composite Panels under Blast Loading", Materials and Structures, Springer, January 2016, Volume 49, Issue 1-2, pp. 611-629.
All the best,
Vasant Matsagar.
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