Interfaces
Block Format Keyword Interfaces solve the contact and impact conditions between two parts of a model. Several interface types are available in Radioss and use different contact treatments.
Each of these interfaces was developed for a specific application field. However, this application field is not the only selection criteria. Some limitations of the different algorithms used in each interface can also determine the choice.
Interface Types
| Contact Treatment | Types | Application | Description | |
|---|---|---|---|---|
| Kinematic Constraint | Tied | /INTER/TYPE2 | Change of mesh density (solid) | Tied connection between two Lagrangian materials. |
| Penalty method | Slide / Void | /INTER/TYPE3 | Use of TYPE7 is recommended | Sliding with void opening
and friction between two Lagrangian surfaces. Symmetric computation (J. Hallquist algorithm). |
| Slide / Void | /INTER/TYPE5 | Use of TYPE7 is recommended | Sliding with void opening
and friction between two Lagrangian surfaces. Non-symmetric computations (main-secondary algorithm). |
|
| Slide / Void | /INTER/TYPE6 | User-defined contacts | Impact contact between two rigid surfaces. | |
| Slide / Void | /INTER/TYPE7 | Solid contact impact at all speeds | Multipurpose
interface. Can be used in place of TYPE3 or TYPE5. Node to Segment contact. |
|
| Slide | /INTER/TYPE8 | Stamping applications | Drawbead line. | |
| Tied / Void | /INTER/TYPE10 | Special purpose interface | Tied contact + void opening (optional) | |
| Slide / Void | /INTER/TYPE11 | For beams, bars or springs | Edge to Edge contact. | |
| Slide / Void | /INTER/TYPE14 | For MADYMO to Radioss coupling. | Hyper-ellipsoid to nodes contact | |
| Slide / Void | /INTER/TYPE15 | For MADYMO to Radioss coupling. | Hyper-ellipsoid to elements contact | |
| Slide / Void | /INTER/TYPE19 | Solid contact impact at all speeds and for beams, bars or springs. | General contact
interface. Node to segment contact and Edge to Edge contact. Equivalent to one interface TYPE7 + one interface TYPE11. |
|
| Slide / Void | /INTER/TYPE21 | For stamping | Specific interface between a non-deformable main surface and a secondary surface designed for stamping. | |
| Slide / Void | /INTER/TYPE23 | For airbag | Soft penalty contact for airbag. | |
| Slide / Void | /INTER/TYPE24 | This contact interface can replace interface TYPE3, TYPE5, or TYPE7. | General contact interface | |
| Slide / Void | /INTER/TYPE25 | General contact interface with linear stiffness. | Multipurpose interface that can replace interface TYPE3, TYPE5, TYPE7, or TYPE24 | |
| Lagrange multiplier method | Tied | /INTER/LAGMUL/TYPE2 | Change of mesh density (solid) | Tied contact between main and secondary nodes. |
| Slide / Void | /INTER/LAGMUL/TYPE7 | Solid contact impact at all speeds | multi-usage impact interface between a main surface and a list of secondary nodes. | |
| Slide / Void | /INTER/LAGMUL/TYPE16 | meshes with 8-node or 16-node thick-shell or 20 bricks | Contact of impact between nodes and external surfaces. | |
| Slide / Void | /INTER/LAGMUL/TYPE17 | meshes with 8-node or 16-node thick-shell or 20 bricks | Contact of impact between external surface of two brick groups. | |
| Automatic Penalty Lagrange | Slide / Void | /INTER/LAGDT/TYPE7 | Solid contact impact at all speeds | Same behavior as TYPE7 with constant minimum time step. |
| Hertz Formulation | Slide / Void | /INTER/HERTZ/TYPE17 | meshes with 16-node thick-shell or 20 bricks. | Using Hertz contact theory to describe impact between external surface of two brick groups. |
| ALE | Tied | /INTER/TYPE1 | Fluid-structure interaction | Boundary between an ALE material and a Lagrangian material. |
| Slide / Void | /INTER/TYPE9 | Fluid-structure interaction | ALE/Lagrange, with void opening and free surface. | |
| FLUID / FLUID | /INTER/TYPE12 | Fluid to fluid contact | Connects two fluid meshes
with free, tied or periodic options. ALE or EULER or LAG/ALE or EULER or LAG |
|
| Slide / Void | /INTER/TYPE18 | Fluid-structure interaction | Coupling between a Lagrangian material an ALE material. |