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The thickness of the spar is 0.02 meters. Locate the appropriate surface bodies that represent the spar and change the thickness to 0.02 meters.
Connections
The contact between the wind blade and the spar needs to be modeled. Right click on Connections and insert a Connection Group.
In the connection group named Contacts 2, change the Face/Face detection to No and Face/Edge detection to Yes.
Right click on Contacts 2 and click on Create Automatic Connections.
Material Properties
For each surface body, check that Structural Steel is assigned as the material.
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