Constitutive law for unilateral contact with friction for:
This law is used for mechanical analysis of unilateral contact with friction in generalized plane state for shells and membranes.
Contact can occur on both sides of shell (or membrane).
A penalty method is chosen to represent the contact.
COULOMB behaviour is assumed, with variable friction coefficient.
Prepro: LCNTSH.F
Lagamine: CNTSH.F
| Plane stress state | NO |
| Plane strain state | NO |
| Axisymmetric state | NO |
| 3D state | NO |
| Generalized plane state | YES |
| Line 1 (2I5, 60A1) | |
|---|---|
| IL | Law number |
| ITYPE | 91 |
| COMMENT | Any comment (up to 60 characters) that will be reproduced on the output listing |
| Line 1 (I5) | |
|---|---|
| N | Number of points defining the COULOMB behaviour |
| Shear stress ($\tau$) vs Pressure (p) | |
Remark :
| Line 1 (2G10.0) | |
|---|---|
| RIGP | Penalty coefficient on pressure ($K_p$) |
| RIGT | Penalty coefficient on shear ($K_{\theta}$) (default = RIGP) |
To repeat N times :
| Line 1 (2G10.0) | |
|---|---|
| P | Pressure p of the considered point |
| T | Shear z of the considered point |
Warning: The first point must always be taken at p=0.
2
| SIG(1) | = p : Pressure |
| > 0 in compression | |
| SIG(2) | = $\tau$ : Shear |
| > 0 according with $\xi$ coordinate of shell (membrane) |
7
| Q(1) | ISEG: Number of foundation segment in contact |
| Q(2) | TO: Side of the shell in contact |
| Q(3) | WT: Total work associated to the integration point (by unit of shell area) |
| Q(4) | WD: Dissipated work associated to the integration point (by unit of shell area) |
| Q(5) | D: Penetration d (positive if contact occur) |
| Q(6) | V: Sliding speed (positive with $\xi$ coordinate of shell) |
| Q(7) | TC: Maximum shear stress, according to the COULOMB constitutive law and the pressure |