Imposing displacement rather then applying force?

[RobertCT]

Hello all!

I'm working on a problem where I need to determine reaction loads based on a imposed displacement of a system.

I have a component (that can be approximated as a long beam) that will be forced to bend (elastically) by brackets supporting it at various locations, I know how much each bracket / support will move (this displacement is imposed by the circumstances of the problem). I need to be able to determine the reaction loads in each of the brackets at this specific displacement.

Is there any way I can run an analysis in FEMAP where instead of imposing loads, i can impose a final deflected shape and have the analysis give me the required loads at specific locations /nodes?

Thanks.

 

[BlasMolero]

Dear Robert,
Oh yes, you can prescribe an enforced displacement using "Model > Load > Nodal > Displacement". But in order to run the analysis you have to prescribe a displacement constraint "Model > Constraint > Nodal" to the same node with the same DOF as you used to prescribe the enforced displacement, if not the NX NASTRAN solver will give you error, OK?.

Best regards,
Blas.

~~~~~~~~~~~~~~~~~~~~~~
Blas Molero Hidalgo
Ingeniero Industrial
Director

IBERISA
48011 BILBAO (SPAIN)
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[rb1957]

try a simple test case to make sure you're doing it right

 

[RobertCT]

I should have clarified, I use NEI Nastran, will this be an issue?

 

[ThomasH]

Hi

It's the same approach in NEiNastran.

You constrain the node and than you enforce a displacement on the constrained node.

Good Luck

Thomas