Fixed Constraint
The Fixed Constraint node adds a condition that makes the geometric entity fixed (fully constrained); that is, the displacements are zero in all directions on the selected geometrical entities. If there are rotational degrees of freedom, they will also be zero.
Layer Selection
This section is only present in the in the Layered Shell interface, where it is described in the documentation for the Fixed Constraint and Fixed Constraint, Interface nodes.
Constraint Settings
To display this section, click the Show button () and select Advanced Physics Options.
In the COMSOL Multiphysics Reference Manual:
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Constraint Reaction Terms
•
Weak Constraints
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Constraint Settings
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Excluded Surfaces, Excluded Edges, and Excluded Points
You can activate and deactivate this boundary condition by assigning it to a constraint group. See Load Cases in the Structural Mechanics Modeling chapter.
Bracket — Frequency-Response Analysis: Application Library path Structural_Mechanics_Module/Tutorials/bracket_frequency
Location in User Interface
Context Menus
Solid Mechanics>Domain Constraints>Fixed Constraint
Solid Mechanics>Fixed Constraint (Boundary)
Solid Mechanics>Edges>Fixed Constraint
Solid Mechanics>Points>Fixed Constraint
Layered Shell>Face and Domain Constraints>Fixed Constraint
Layered Shell>Face and Domain Constraints>Interfaces>Fixed Constraint, Interface
Layered Shell>Fixed Constraint (Edge)
Layered Shell>More Constraints>Interfaces>Fixed Constraint, Interface (Edge)
Layered Shell>Points>Fixed Constraint
Layered Shell>Points>Interfaces>Fixed Constraint, Interface
Membrane>Face Constraints>Fixed Constraint
Membrane>Fixed Constraint (Edge)
Membrane>Points>Fixed Constraint
Beam>Line Constraints>Fixed Constraint
Beam>Fixed Constraint (Point)
Multibody Dynamics>Domain Constraints>Fixed Constraint
Multibody Dynamics>Fixed Constraint (Boundary)
Multibody Dynamics>Edges>Fixed Constraint
Multibody Dynamics>Points>Fixed Constraint
Ribbon
Physics tab with Solid Mechanics selected:
Domains>Domain Constraints>Fixed Constraint
Boundaries>Solid Mechanics>Fixed Constraint
Edges>Solid Mechanics>Fixed Constraint
Points>Solid Mechanics>Fixed Constraint
Physics tab with Layered Shell selected:
Boundaries>Face and Domain Constraints>Fixed Constraint
Boundaries>Interfaces>Fixed Constraint, Interface
Edges>Layered Shell>Fixed Constraint
Edges>Interfaces>Fixed Constraint, Interface
Points>Layered Shell>Fixed Constraint
Points>Interfaces>Fixed Constraint, Interface
Physics tab with Membrane selected:
Boundaries>Face Constraints>Fixed Constraint
Edges>Membrane>Fixed Constraint
Points>Membrane>Fixed Constraint
Physics tab with Beam selected:
Edges>Line Constraints>Fixed Constraint
Points>Truss>Fixed Constraint
Physics tab with Multibody Dynamics selected:
Domains>Domain Constraints>Fixed Constraint
Boundaries>Multibody Dynamics>Fixed Constraint
Edges>Multibody Dynamics>Fixed Constraint
Points>Multibody Dynamics>Fixed Constraint