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更详细的情况见help。参考一下吧。
connections:
A connection is the mating area between two assembly components. Use the Insert>Connection command to create connections in Mechanica. When analyzing an assembly for which you have created connections, Mechanica uses the connection type and definition to determine the nature of the association between the connected areas.
You can create the following kinds of connections:
Native Mode:welds、interfaces、fasteners、rigid links、weighted links;
FEM Mode:welds、interfaces、rigid links、weighted links、gaps
For assemblies in the native mode that include compressed midsurface shells, you must consider how you want Mechanica to treat mating and overlapping surfaces. When the surfaces of a component modeled with midsurfaces mate or overlap with the surfaces of another component, Mechanica creates automatic midsurface connections between all surfaces of the two components that are in contact with each other. Mechanica makes an exception for any surface where you explicitly create a weld, fastener, rigid link, or an interface.
After you create connections in the model, you can preview the different types of connection in your model using the Info>Model Connectivity command.
Links defined in the component, are propagated to the assembly. The coordinate system that the part refers to is transformed at the assembly level. That is, if a link refers to certain directions in the WCS of a part, then at the assembly level it refers to a UCS at the part WCS location.
Bonded Interfaces:
Use the Bonded interface to connect the components or surfaces that are touching each other. The components connected with bonded always touch each other during analysis. During meshing, the coincident nodes on these components merge.
You can create a Bonded interface in Structure and Thermal module of Mechanica.
In Native mode, you can create Bonded interface only between mating surfaces. If you select Surface-Surface reference type and select two surfaces that are not touching, Mechanica displays an error message after you click OK on the Interface Definition dialog box.
In FEM mode, you can connect non-matting surfaces also using Bonded interface. You can create rigid links instead of merging the nodes. When you select Bonded as a Type of interface on the Interface Definition dialog box, Mechanica selects the Merge Coincident Nodes check box in the Properties section. If you clear this check box, Mechanica creates links between coincident nodes on two bonded surfaces.
When you create a Bonded interface between any two surfaces in an assembly, Mechanica automatically creates a force measure to calculate the magnitude of resultant force over the bonded interface. When you create a Bonded interface between any two surfaces in the Thermal module, Mechanica automatically creates a heat transfer rate measure to calculate the rate of total heat transfer over the bonded interface.
[ 本帖最后由 iampopdeng 于 2009-6-2 17:34 编辑 ] |
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