Enabling or disabling contact and glue simulation objects in subcases (Simcenter Samcef)

In the Simcenter Samcef environment, you can enable or disable contact or glue simulation objects for a subcase.

You can enable or disable all the contact or glue simulation objects of the Structural or Thermal analysis types except for gluing simulation objects that use the .APS card name or for the bidirectional Surface-to-Surface contact.

Simulation objects are boundary conditions. For information on creating them, adding them to solutions or subcases, and managing them in folders, see Managing boundary conditions.

The placement of contact or glue simulation objects in the subcases determines how Simcenter Samcef enables or disables them.

For more details on how Simcenter Samcef enables or disables these objects, see the Modification of element status section of the Samcef .SUBCASE command.

Enabling

The first time a simulation object appears in a subcase, it is linearly enabled during the time duration of the subcase. It starts to be enabled at the beginning of the time interval definition of that subcase (1) and is fully enabled at the end of that subcase (2) (ramp).

It remains active until it is disabled or until the end of the computation.

To fulfill Simcenter Samcef solver rules, each simulation object that is enabled in a specific subcase that is not the first subcase will be disabled at the very beginning of the solve (Samcef SUBCASE 0 subcase). It remains disabled until it appears in the subcase that enables it.

Enabling the first subcase

When you add a simulation object in the first subcase, it is enabled from the beginning of the subcase time interval; there is no ramp.

So, the following schema is not possible:

Disabling

Similarly, when a simulation object appears continuously in several successive subcases (1) but then starts to be omitted in a specific subcases (3), the solver starts to disable the simulation object in that subcase. The simulation object is fully disabled at the end of that subcase (ramp) (3).

It remains inactive during the rest of the computation (3).

Enabling and disabling

To use a simulation object as fully enabled during some subcases and disabled in others, you must:

1. Add it to the subcase in which you want to start the enabling process (subcase 2 in the example) (1).

2. Add it to the subcases during which you want it to be fully enabled (subcases 3 and 4 in the example) (2).

3. Remove it from the subcase during which you want the disabling process to take place. (3).

Simulation objects that only are in the Simulation Objects container

By default, all the simulation objects that appear in the Simulation Objects container of the solution and not in any Simulation Objects container of a subcase are enabled.

Examples

For examples on enabling or disabling contact and glue simulation objects, see Examples of enabling or disabling contact and glue simulation objects in subcases (Simcenter Samcef).

Remark: the asymmetric enabling/disabling schema

The enabling and disabling workflow follows an asymmetric schema:

• When you add a simulation object for the first time in a subcase, the object starts to be enabled at the beginning of that subcase and is fully enabled at the end of that subcase.From the beginning of the subcase and throughout the enabling process, that object influences the computation and you see it in the Simulation Objects container of that subcase.

• When you remove a simulation object from a subcase, the object starts to be disabled at the beginning of that subcase and is fully disabled at the end of that subcase.From the beginning of the subcase and throughout the disabling process, even if the object is dedicated to be disabled, it continues to influence the computation but you do not see it in the Simulation Objects container of that subcase.

Note:

This schema follows the same rules as the Simcenter Nastran SOL 402 schema.

Learn more

Enabling or disabling elements in subcases (Simcenter Samcef)

Controlling the birth and death times of elements in nonlinear and thermal analyses (Simcenter Samcef)

Examples of enabling or disabling contact and glue simulation objects in subcases (Simcenter Samcef)

Global remarks and limitations when enabling or disabling entities (Simcenter Samcef)

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

Enabling or disabling contact and glue simulation objects in subcases (Simcenter Samcef), Simcenter 3D 2021.1 Series

© 2020 Siemens

window.mainLanguage="en_US"

window.delivId=""

window.projectId=""

MathJax.Hub.Config({ TeX: { extensions: ["autoload-all.js"] }, tex2jax: { displayMath: [ ] }, "SVG": { scale: 125 } });