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laws:dvree
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DVREE
Description
Simple damage constitutive law.
The model
This law is used for mechanical analysis for solids.
Files
Prepro: LDVREE.F
Lagamine: DVREE.F
Availability
| Plane stress state | NO |
| Plane strain state | YES |
| Axisymmetric state | NO |
| 3D state | NO |
| Generalized plane state | NO |
Input file
Parameters defining the type of constitutive law
| Line 1 (2I5, 60A1) | |
|---|---|
| IL | Law number |
| ITYPE | 592 |
| COMMNT | Any comment (up to 60 characters) that will be reproduced on the output listing |
Integer parameters
| Line 1 (3I5) | |
|---|---|
| NINTV | = 1 (by default) |
| ISOL | = 0 : Use of total stresses in the constitutive law |
| ≠ 0 : Use of effective stresses in the constitutive law (see annex 8) | |
| ITEMOIN | = 1 : Constitutive matrix computed by perturbation |
| = 0 : Secant matrix | |
| = -1 : Analytical tangent matrix | |
Real parameters
| Line 1 (3G10.0) | |
|---|---|
| E | YOUNG's elastic modulus |
| ANU | POISSON's ratio |
| FT | Tensile strength |
| Line 2 (3G10.0) | |
| ALPHA | 1st parameter controlling the final stress |
| BETA | 2nd parameter controlling the shape of the softening curve |
| ETA | Ratio of the compressive stress limit over the tensile stress limit |
| Line 3 (2G10.0) | |
| DIV | Time integration parameter |
| RHOS | Specific mass |
Stresses
Number of stresses
4 (2D only)
Meaning
The stresses are the components of CAUCHY stress tensor in global (X,Y,Z) coordinates.
For the 2D state :
| SIG(1) | $\sigma_{xx}$ |
| SIG(2) | $\sigma_{yy}$ |
| SIG(3) | $\sigma_{xy}$ |
| SIG(4) | $\sigma_{zz}$ |
State variables
Number of state variables
10
List of state variables
2D plane strain or axisymmetric analysis :
| Q(1) | THICK : Thickness (axisymmetric or plane stress state) |
| Q(2) | D : Damage |
| Q(3) | EPSTIL : Equivalent deformation |
| Q(4) | RHOS : Actualised specific mass |
| Q(5) | DXXT : Strain computed at the previous step |
| Q(6) | DYYT : Strain computed at the previous step |
| Q(7) | DZZT : Strain computed at the previous step |
| Q(8) | DXYT : Strain computed at the previous step |
| Q(9) | = 1 : FLAG : Flag for increasing damage |
| = 0 : FLAG : Flag for constant damage | |
| Q(10) | EPSD0 damage threshold |
laws/dvree.txt · Last modified: 2020/08/25 15:46 (external edit)
