Dear all,

For a compression test, I modelled a concrete cylinder (diameter:150mm,height:375mm, fixed at the base). I applied 2 mm displacement under 2 sec and 4 sec separately, using dynamic implicit and explicit methods. The obtained results were the same. However, the problem is that the stress-strain curve of a concrete element does not follow the experimental stress-strain curve defined. I tried different analysis options that included decreasing tolerance by a scale factor of 0.1 in one case, using the CDP model without the compression and tension damage features in another case. Unfortunately, none of them fixed the problem of following the defined stress/strain curve.

Could you please explain what can be the reason for this situation?

Mesh Element type:

-Standard-3d Stress

-Linear

-C3D8R- Hourglasscontrol default

The CDP parameters used are as follows:

Dilation Angle=40
Eccentricity= 0.1
fb0/fc0=1.16
K=0.6667
Viscosity Parameter=0
E=20111 MPa
fyield=24.5 (Inelastic Strain=0)
fcu=29.1 (Inelastic Strain=0.000638)
fy=3.6

As shown in the attachment, all the other yield stresses and inelastic strains were defined.

Abaqus ​​​​​​​