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BINDS
Description
These elements are used to impose a linear relationship between the DOF of some nodes
They must refer to the material law: “BINDS” (ITYPE= 30)
Element type: 99
Implemented by: Bertarini I. (1986) & revised by Pascon F. (1999)
Example of relationship:
$\displaystyle\sum_{i=1}^{m} \alpha_i . \delta_i = \alpha_0$
With:
$\delta_i$: the degree of freedom (translation or rotation: 1, 2 …)
$\alpha_i$ and $\alpha_0$: data specified in the section “COLAW” for the material: LMATE and specified in each relation
$m$: number of terms in the linear relationship
See example below
Files
Prepro: BINDSA.F
Lagamine: BINDSB.F
Input file
Sub-Title
| TITLE (A5) | |
|---|---|
| TITLE | “BINDS” |
Control data (1 I5)
| NELEM | number of elements |
Definition of the elements
| For each element: | |
|---|---|
| 1 Line (3I5) | |
| LMATE | material number (type 30) |
| NNODE | number of terms in the relation (max: 10) (see note 1) |
| INDISO | position of $\alpha_0$ in the list of the $\alpha$ coefficients of the law LMATE |
| NNODE lines (3I5) | |
| NODES(I) | node number in the relation |
| IDOF(I) | componant of the node used in the relation (1: first DOF, 2: second DOF …) (see note 2) |
| INDIS(I) | position of the coefficient $\alpha_i$ in the law LMATE |
Notes
1: if NNODE >10, the subroutines: BINDSA and BINDSB must be adapted
2: Number of DOF in global axes
1= displacement in X direction 2= displacement in Y direction 3= displacement in Z direction 4= rotation around the axis X 5= rotation around the axis Y 6= rotation around the axis Z
3: Results: forces in the spring
4: The $\alpha_0$ coefficient is multiplied by DMULT
Example
If you have the following two relations:
$$
Results
Effort in the spring
