Zero-valued boundary constraint (Abaqus)

You can define a zero-valued boundary constraint by selecting the Zero-Valued Boundary type in the User Defined Constraint dialog box. A zero-valued boundary constraint lets you constrain one or more DOFs. The DOF correspond to the nodal displacement coordinate system. Each DOF can be set to fixed or free. For Abaqus Structural or Axisymmetric Dynamic Structural analyses, you can apply a zero-valued boundary constraint at both the Solution and step levels.

The following example shows how you can restrain DOF1 and DOF2 of the reference node of a shaft. These DOFs correspond to X and Y directions of the global coordinate system.

• DOF1 = Fixed

• DOF2 = Fixed

The options in the User Defined Constraint dialog box for a zero-valued boundary constraint correspond to the Abaqus *BOUNDARY keyword. For more information, see:

• Boundary conditions in Abaqus/Standard and Abaqus/Explicit in the Abaqus Analysis User's Guide

• *BOUNDARY in the Abaqus Keywords Reference Guide.

Keeping the values of the DOFs fixed

You can use the Fixed check box in the User Defined Constraint dialog box to keep the specified DOFs fixed at their values from the last General step. The solver uses the fixed values for the start of the next step. Setting DOFs as fixed is available for Abaqus Structural analyses.

Where do I find it?

Application	Pre/Post
Prerequisite	A Simulation file as the work part and displayed partAbaqus as the specified solverAll analyses except Thermal and Axisymmetric Thermal
Command Finder	User Defined Constraint
Simulation Navigator	In the appropriate step or at the solution level, right-click Constraint Container→New Constraint→User Defined Constraint
Dialog box	For a zero-valued constraint at the step level, set Type→Zero-Valued Boundary

How do I

Define user-defined constraints

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User defined constraint

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Zero-valued boundary constraint (Abaqus), Simcenter 3D 2021.1 Series

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