Boundary, Edge, Point, and Pair Nodes for the Truss Interface
The Truss Interface has these boundary, edge, point, and pair nodes are available from the Physics ribbon toolbar (Windows users), Physics context menu (Mac or Linux users), or right-click to access the context menu (all users).
In general, to add a node, go to the Physics toolbar, no matter what operating system you are using. Subnodes are available by clicking the parent node and selecting it from the Attributes menu.
Features Available from Submenus
Many features for the Truss interface are added from submenus in the Physics toolbar groups or context menu (when you right-click the node). The submenu name is the same in both cases. The submenus at the Edge level (3D) or Boundary level (2D) are
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 Material Models
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 Line and Volume Loads
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 Mass, Spring, and Damper
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 Line Constraints
The submenus at the Point level are
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 Mass, Spring, and Damper
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 More Constraints
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 Pairs
Links to Feature Node Information
These nodes (and subnodes) are described in this section (listed in alphabetical order):
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Antisymmetry
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Cross-Section Data
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Edge Load
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External Stress
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Hygroscopic Swelling
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Initial Stress and Strain
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Linear Elastic Material
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Pinned
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Point Mass
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Set Variables
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Spring-Damper Material
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Straight Edge Constraint
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Symmetry
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Thermal Expansion (for Constraints)
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Thermal Expansion (for Linear Elastic Material)
These nodes are described for the Solid Mechanics or Beam interface:
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Activation
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Added Mass
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Average Rotation
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Base Excitation
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Damping
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Free
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Gravity
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Harmonic Perturbation
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Initial Values
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Linearly Accelerated Frame1
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Phase
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Plasticity
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Point Load
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Point Load, Free
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Predeformation
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Prescribed Acceleration
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Prescribed Displacement
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Prescribed Velocity
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Rotating Frame1
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Shape Memory Alloy
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Spring Foundation
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Spring-Damper
1 This is selected from the Line and Volume Loads submenu for this interface.
If there are subsequent constraints on the same geometrical entity, the last one takes precedence.
In the COMSOL Multiphysics Reference Manual see Table 2-4 for links to common sections and Table 2-5 to common feature nodes. You can also search for information: press F1 to open the Help window or Ctrl+F1 to open the Documentation window.