Hi!
I would like to get some help with connecting two planes with each other with rigid elements for example so i can get reaction loads in that element that connects the two surfaces, someone know how to do this, please? The planes consists of shell elements. There must be a way to achieve that in Nastran In Cad im hoping. In Ansys i once was selecting certain nodes/elements and was connecting those to a singel point etc making those rigid, i was hoping that i somehow could do the same in nastran.
Best regards, Daniel
Solved! Go to Solution.
Solved by John_Holtz. Go to Solution.
Solved by John_Holtz. Go to Solution.
Hi Daniel
Take a look attached video creating rigid elements between two surfaces. You have to choose 2 faces and select Point at center to create independent node at center between them.
If my post answers your question, please click the "Accept as Solution" button. This helps everyone find answers more quickly!
Vanderson's reply about using the rigid connector is part of the answer to your question. However, it does not eliminate the problem with getting the force transmitted from one plate to the other. The force at the center of a rigid connector is zero because the forces on the top plate are equal and opposite to the forces on the bottom plate.
Whether you use a rigid connector, contact, or some other means, you need to sum the results from the nodes on the plate that are connected together. The Inventor interface does not have a convenient way to sum the results. You will need to inquire on the nodes individually and add them together, or use a third-party tool. (FNO Reader comes to mind. Version 1.58 is the current version.)
Now that I look at a test model, one way to simplify it is to use two rigid connectors (one on the top, one on the bottom), and connect the two rigid connectors with a rigid spring. Since there is only one spring connecting the two faces (instead of N spokes in a rigid connector), their is only one element where you need to get the forces and moments.
John
Hi John! Thank you very much! What values did you use for the spring? Because no matter how much stiffeness i use it falls thru alot, see pic below. Also i wonder, how do i extract loads from the spring?
You may not be entering the spring stiffness properly because the interface makes it more difficult than it should be.
If you have requested to output the force results ("Analysis > Edit > Output Controls > Force"), you can view the force in the spring using the result type of "Other > BUSH Force-Y". (I do not know why Nastran calls a spring "BUSH", but BUSH means spring. Maybe Google will come out with a translator for Nastran to English and other languages 🙂.)
Let us know if you have any other problems.
John
Can't find what you're looking for? Ask the community or share your knowledge.