Boundary, Edge, Point, Global and Pair Nodes for the Truss, Explicit Dynamics Interface
Most of the features in the Truss Explicit Dynamics interface are identical to the same features in the Solid Mechanics interface, and are thus documented there.
The Truss, Explicit Dynamics 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
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 More
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 are described for the Truss interface:
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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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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, Explicit Dynamics interface::
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Mass Scaling
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Prescribed Displacement (on Domains)
These nodes are described for the Solid Mechanics interface
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Activation
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Added Mass
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Adiabatic Heating
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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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Predeformation
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Prescribed Displacement (on points, edges, and boundaries)
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Rotating Frame1
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Safety
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Spring Foundation
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.