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发表于 2010-7-4 19:54:54
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Spot welds are used to connect individual surface body parts together to form surface body model assemblies, just as contact is used for solid body part assemblies. Structural loads are transferred from one surface body part to another via the spot weld connection points, allowing for simulation of surface body model assemblies.
Spot Weld Details
Spot welds are usually defined in the CAD system and automatically generated upon import, although you can define them manually in Simulation after the model is imported. Spot welds then become hard points in the geometric model. Hard points are vertices in the geometry that are linked together using beam elements during the meshing process.
Spot weld objects are located in the Connections object in the Tree Outline. When selected in the tree, they appear in the graphical window highlighted by a black square around a white dot on the underlying vertices, with an annotation.
If a surface body model contains spot weld features in the CAD system, then spot welds are auto-generated when the model is read into Simulation or when Generate Contact on Update is set to Yes in the Details view of the Connections object in the Tree Outline. This is similar to the way in which Simulation automatically constructs contact condition when reading in assemblies of solid models.
You can manually generate spot welds as you would insert any new object into the Outline tree. Either insert a spot weld object from the context menu and then pick two appropriate vertices in the model, or pick two appropriate vertices and then insert the spot weld object.
You can define spot welds for CAD models that do not have a spot weld feature in the CAD system, as long as the model contains vertices at the desired locations. You must define spot welds manually in these cases.
Spot Weld Assumptions and Restrictions
Spot welds do not act to prevent penetration of the connected surface body in areas other than at the spot weld location. Penetration of the joined surface body is possible in areas where spot welds do not exist.
Spot welds only transfer structural loads and structural effects between surface body parts. Therefore they are appropriate for displacement, stress, elastic strain, and frequency solutions.
DesignModeler generates spot welds. The only CAD system whose spot welds can be fully realized in ANSYS Workbench at this time is Unigraphics. The APIs of the remaining CAD systems either do not handle spot welds, or the ANSYS Workbench software does not read spot welds from these other CAD systems. |
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发表于 2010-7-4 19:52:50
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发表于 2010-7-4 23:50:09