![](../icons_C2/common/areference.gif) |
Iso-static Restraints are
statically definite restraints allowing you to
simply support a body.
(this is an example of a part iso-statically restrained)
![](images/aaImageRestraintIsoStatic.gif)
means
that there is no translation degree of freedom left in that direction.
Iso-static Restraint objects belong to Restraint objects sets.
The program automatically chooses three points and
restrains some of their degrees of freedom according to the 3-2-1
rule. The resulting boundary condition prevents the body from rigid-body
translations and rotations, without over-constraining it.
Make sure you fixed all the global
degrees of freedom of your assembly, otherwise a global singularity will
be detected at the time of the Static Computation (such a model is
unsolvable). To allow you to easily correct the model (Static Analysis
Cases only), the singular displacement of the assembly will be simulated
and visualized after computation.
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![](../icons_C2/common/atarget.gif) |
This task shows how to create an
Iso-Static Restraint on a body.
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You can use the sample00.CATAnalysis
document from the samples directory for this task: a Finite Element Model containing a
Static or Frequency Analysis Case. Before You Begin:
Go to View -> Render Style -> Customize View and make
sure the Shading, Outlines and Materials options are
active in the Custom View Modes dialog box. |
![](../icons_C2/common/ascenari.gif) |
1. Click the Isostatic Restraint icon .
The Isostatic Restraint dialog box is displayed.
![](images/aPanelRestraintIsostatic.gif)
2.
You can change the identifier of the Iso-static
Restraint by
editing the Name field.
3. Click OK in the Iso-static Restraint dialog box to create the
Iso-static
Restraint.
An Isostatic.1 object appears in the specification tree under the
active Restraints objects set.
![](images/6treerestraintiso.gif)
An Iso-static symbol appears on the geometry.
![](images/aaImageIsoStaticgif.gif)
You can double-click the Iso-static symbol on the geometry or the Isostatic.1 object
in the specification tree, to display the Iso-static Restraint dialog box
and modify the Name, if needed.
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![](../icons_C2/common/amethod.gif) |
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![ainfo.gif (980 bytes)](../icons_C2/common/awarning.gif) |
Make sure the computation is finished before
starting any of the following operations. |
![ainfo.gif (980 bytes)](../icons_C2/common/tips.gif)
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Products
Available in
Analysis Workbench
The ELFINI Structural Analysis
product offers the following additional features with a right mouse click
(key 3)
![](_themes/v5r5/ul1.gif) |
on an Iso-Static Restraint object:
![](_themes/v5r5/ul2.gif) |
Iso-static Restraint Visualization on Mesh: the translation of
your Iso-static Restraint object specifications into solver
specifications can be visualized symbolically at the impacted mesh
nodes, provided the mesh has been previously generated via a Compute
action.
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![](_themes/v5r5/ul1.gif) | on a Restraints objects set:
![](_themes/v5r5/ul2.gif) | Generate Image: generates an image of the computed Restraint objects
(along with translating all user-defined Restraints specs into explicit solver
commands on mesh entities), by
generating symbols for the nodal restraints imposed by the Restraints
objects set. The image can be edited to include part or all of the
options available. |
![](_themes/v5r5/ul2.gif) | Report: the partial status and results of intermediate
pre-processor computations are reported in HTML format. It represents
a subset of the global Report capability and generates a partial
report of the Restraints objects set Computation. |
See Creating Clamps for more details.
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![](../icons_C2/common/aendtask.gif)
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