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laws:cntsh
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CNTSH
Description
Constitutive law for unilateral contact with friction for:
The model
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.
Files
Prepro: LCNTSH.F
Lagamine: CNTSH.F
Availability
| Plane stress state | NO |
| Plane strain state | NO |
| Axisymmetric state | NO |
| 3D state | NO |
| Generalized plane state | YES |
Input file
Parameters defining the type of constitutive law
| Line 1 (2I5, 60A1) | |
|---|---|
| IL | Law number |
| ITYPE | 91 |
| COMMENT | Any comment (up to 60 characters) that will be reproduced on the output listing |
Integer parameters
| Line 1 (I5) | |
|---|---|
| N | Number of points defining the COULOMB behaviour |
| Shear stress ($\tau$) vs Pressure (p) | |
Remark :
- N must be equal to 2 or greater ;
- The constitutive law will be stored in central memory. So we must have the following condition : \[2\times N + 2 \leq MPARA\]
Real parameters
Global datas
| Line 1 (2G10.0) | |
|---|---|
| RIGP | Penalty coefficient on pressure ($K_p$) |
| RIGT | Penalty coefficient on shear ($K_{\theta}$) (default = RIGP) |
COULOMB constitutive law
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.
Stresses
Number of stresses
2
Meaning
| SIG(1) | = p : Pressure |
| > 0 in compression | |
| SIG(2) | = $\tau$ : Shear |
| > 0 according with $\xi$ coordinate of shell (membrane) |
State variables
Number of state variables
7
List of state variables
| 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 |
laws/cntsh.txt · Last modified: 2020/08/25 15:46 (external edit)
