Elastic constraints

Altair Forum User

Hello, everyone!

 

In my scientific work I do a Static Analysis and Linear Buckling Analysis of the beam.
The beam is attached to the plate. I want to analyze the beam without a plate model, but given its rigidity.

The attached screenshots show that the elasticity of the plate greatly affects the state of stress.

 

How I can make constraints with rigidity for the beam?

and

How to determine the rigidity of fastening to the plate?

 

The problem is put in a simple form for an example. 

This approach is necessary for the analysis of models where the basic design is complex, but its rigidity needs to be taken into account, and the analysis area is much smaller and is used many times.

 

Is it possible to solve the model this way and how?
 

I'm waiting for help.

 

 

 

 

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Altair Forum User

Hi @Andrey

 

So you want to make the plate rigid, is that correct?

 

Two ways, 1) Attach a RBE2 to all nodes of the plate and constrain the master node of the RBE2

2) Provide a very high young's modulus to the plate material

Altair Forum User

Hello @Prakash Pagadala 

No! It's too easy

 

My idea:

To determine the rigidity of the plates' nodes in the plane of contact with the beam. (x,y,z,rx,ry,rz)

then

Set these values for springs (CBUSH zero length).

then

Get the results of linear static analysis with springs the same as with the plate.

 

In other words, get the results for the beam + plate = the results beam + springs ?

Is it possible ?

 

(sorry for my English. I hope you understand my idea)

Altair Forum User

Hi @Andrey

 

That is one option which closely resembles a RBE case /emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20'>

 

Yeah, but I think it should work with zero length CBUSH and stiffness in directions.