Add the Solid–Beam Connection multiphysics coupling node (
) to create transitions between domains modeled using the Solid Mechanics or Multibody Dynamics interfaces and edges modeled using the Beam interface.
The 2D and 3D versions of the Solid–Beam Connection are fundamentally different, and are treated separately below.
Select Solid mechanics —
Solid Mechanics or
Multibody Dynamics.
Select the Beam interface to couple.
Select the Connection type —
Solid boundaries to beam points,
Solid and beam shared boundaries,
Solid and beam parallel boundaries, or
Solid edges to beam points.
For a manual selection, select the connected solid boundaries in the Boundary Selection, Solid section and the corresponding beam points in the
Point Selection, Beam section.
Select Connected area defined by —
Section height,
Selected boundaries, or
Distance from beam axis. This parameter determines how much of the selected solid boundaries that are actually connected to the beam. The default is that a distance from the beam point having the size of the half the beam section height in each direction is connected. Using
Selected boundaries connects the entire selected boundaries to the beam. If you select
Distance from beam axis, enter a
Distance d. This is used instead of the section height for defining the connection distance.
Select a Method —
Rigid or
Flexible. The
Rigid version of the coupling only adds constraints to the boundary of the solid, which in general causes local disturbances of the stress field, since the thickness cannot change. When using the
Flexible coupling, three extra degrees of freedom are added to each beam point. This allows for a more accurate description of the transition, but the model can in some cases become unconstrained if the mesh on the solid is very coarse.
When the connected area is determined by either the Section height or
Distance from beam axis options, the connected area is slightly extended by a distance
Δ. Select how to determine this
Connection tolerance —
Automatic or
User defined. For
Automatic, the tolerance
Δ is set to 0.5% of the beam height, which allows for small inaccuracies on for example a curved geometry. By selecting
User defined, you can modify the value of
Δ.
If the automatic selection is not sufficient, select the Manual control of selections check box. Then, select the connected boundaries in the
Boundary Selection section.
The connected area is slightly extended by the distance Δ. Select how to determine this
Connection tolerance —
Automatic or
User defined. The
Automatic option sets the value of the tolerance
Δ to 0.5% of section height of the beam. By selecting the
User defined option, you can modify the value of the tolerance
Δ.
Select the connected solid boundaries in the Boundary Selection, Solid section and the corresponding beam edges in the
Boundary Selection, Beam section.
Select Distance evaluation —
Section height,
Geometrical distance, or
User defined. This parameter determines how the coupling treats the determination of the connection distance, used when expressing the coupling between translation and rotation. The default is that a distance equal to half the section height is used. If you select
Geometrical distance, the connection distance is computed from the geometrical distance between the solid boundary and the beam boundary. For
User defined enter a
Distance d. This defines the connection distance.
The connected area is slightly extended by a distance Δ. Select how to determine this
Connection tolerance —
Automatic or
User defined. For
Automatic, the tolerance
Δ is set to 0.5% of the beam height, which allows for small inaccuracies on, for example, a curved geometry. By selecting
User defined, you can modify the value of
Δ.
Select the Connection type —
Solid boundaries to beam points, general,
Solid boundaries to beam points, transition,
Solid boundaries to beam edges, or
Solid edges to beam points. For the connections to beam points, there is an automatic search for possible adjacent geometrical objects. If you want to modify the selections, select the
Manual control of selections check box. If you clear it again, the selections will be replaced by the automatic ones.
If the automatic selection is not sufficient, select the Manual control of selections check box. Then, select the connected solid boundaries in the
Boundary Selection, Solid section and select the corresponding beam points in the
Point Selection, Beam section.
Select a Connected region —
Selected boundaries,
Distance (automatic),
Distance (manual), or
Connection criterion.
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Using Selected boundaries makes all selected boundaries to be rigidly connected to the point on the beam.
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For Distance (automatic), all parts on the solid boundary, which are within the default distance from the beam point, are connected. This distance is determined by the cross section properties of the beam. It is contained in the variable beam.re as described in the documentation for The Beam Interface.
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For Distance (manual) enter a Connection radius rc. All parts on the solid boundary, which are within the given distance from the beam point, are connected.
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For Connection criterion enter a Boolean expression in the text field. The beam is connected to the selected solid boundaries, wherever the expression has a nonzero value. The default value is 1, which is equivalent to using the Selected boundaries option.
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If the automatic selection is not sufficient, select the Manual control of selections check box. Then, select the connected solid boundaries in the
Boundary Selection, Solid section and select the corresponding beam points in the
Point Selection, Beam section.
The coupling can introduce a set of extra degrees of freedom on the solid boundary for computing the warping displacement over the cross section. Select Include warping —
Automatic,
Yes, or
No, to control this behavior. If
Automatic is selected, warping will be included, unless the beam cross section is one of the predefined sections
Circular or
Pipe. To explicitly control the behavior, select
Yes or
No.
Select a Connected region —
Selected boundaries,
Beam width, or
Connection criterion.
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Using Selected boundaries makes all selected boundaries to be rigidly connected to the point on the beam. This is mainly useful if the boundary has approximately the same shape as the physical size of the beam, such as a rectangle with the same width as a beam flange.
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For Beam width, enter a Width w. All parts on the solid boundary, which are within the given distance from the projection of the beam axis on the solid, are connected. For cases when the beam is asymmetric, that is when the connection distance from the beam axis is not the same in both directions, enter also an Offset d. The positive orientation of the offset is n × t, where n is the outward normal of the solid, and t is the positive orientation of the beam edge.
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For Connection criterion enter a Boolean expression in the text field. The beam is connected to the selected solid boundary, wherever the expression has a nonzero value. The default value is 1, which is equivalent to using the Selected boundaries option.
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Select the connected solid edges in the Edge Selection, Solid section and select the corresponding beam points in the
Point Selection, Beam section.
Select a Connected region —
Selected edges,
Distance (automatic),
Distance (manual), or
Connection criterion.
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Using Selected edges makes all selected edges to be rigidly connected to the point on the beam.
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For Distance (automatic), all parts on the solid edges, which are within the default distance from the beam point, are connected. The distance is determined by the cross section properties of the beam. It is contained in the variable beam.re as described in the documentation for The Beam Interface.
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For Distance (manual) enter a Connection radius rc. All parts on the solid edges, which are within the given distance from the beam point, are connected.
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For Connection criterion enter a Boolean expression in the text field. The beam is connected to the selected solid edges, wherever the expression has a nonzero value. The default value is 1, which is equivalent to using the Selected edges option.
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