/INTER/LAGMUL/TYPE7
Block Format Keyword Describes the Lagrange Multiplier interface TYPE7. multi usage impact interface between a main surface and a list of secondary nodes.
Description
All limitations encountered with interfaces TYPE3 and TYPE5 are solved with this interface:
- A node can be at the same time a secondary and a main node.
- Each secondary node can impact each main segment; except if it is connected to this segment.
- A node can impact on more than one segment.
- A node can impact on the two sides, on the edges and on the corners of each segments.
- Fast search algorithm without limitations. Time step is not reduced.
The main limitations are:
- Friction models are not yet implemented
- It is not compatible with any standard kinematic conditions
- It is not compatible with SPMD parallel version
Format
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| /INTER/LAGMUL/TYPE7/inter_ID | |||||||||
| inter_title | |||||||||
| grnd_IDs | surf_IDm | ||||||||
| Blank Format | |||||||||
| Blank Format | |||||||||
| Gapmin | |||||||||
| Bumult | |||||||||
| Blank Format | |||||||||
Definitions
| Field | Contents | SI Unit Example |
|---|---|---|
| inter_ID | Interface
identifier (Integer, maximum 10 digits) |
|
| inter_title | Interface
title (Character, maximum 100 characters) |
|
| grnd_IDs | Secondary nodes group
identifier (Integer) |
|
| surf_IDm | Main surface
identifier (Integer) |
|
| Gapmin | Minimum gap for impact
activation (Real) |
|
| Bumult | Sorting factor - used to
speed up the sorting algorithm. Default set to 0.20 (Real) |
Comments
- The defined nodes must have non-zero mass.
- The Gapmin may be smaller than non-Lagrange interface type 7. It is used in order to determine if a secondary node is in contact or not.
- The default value for Bumult is automatically increased to 0.30 for models which have more than 1.5 million nodes and to 0.40 for models with more than 2.5 million of nodes.