Spring FEM deformation

[Pedrovx]

Hello everyone,

I'm trying to make the FEM of a modeled compression spring, with both ends grounded and squared, and when I see the results the spring deformation not seems like on reality must to be. Has a very small compression in comparison, even loading it with huge loads.

I think that I'm leaving some option back, I just worked till now on normal structures, and I'm quite lost. The researches only showed me how to move simulate it.

I'm currently using NX8 with Nastran Solver, and for the deformation representation I put the Absolute scale, to get see the correct dimensions.

Thanks for the help.

 

[BlasMolero]

Dear Pedro,
This is not a simply problem, this is highly nonlinear: as an absolute minimum you need to account for geometric nonlinear large displacement effect + surface-to-surface contact, and enter the stress-strain relationship of the special steel material for springs, then you need to use the AdvanceD Nonlinear module (SOL601) to arrive to correct & accurate results.

Best regards,
Blas.

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

IBERISA
48011 BILBAO (SPAIN)
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http://www.iberisa.com

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[Pedrovx]

Thanks for the answer Blas, actually I get the nonlinear solution for a basic spring, and I am improving it to adjust to the real spring model.
I have one more question, ADVNL 601,106 not provide me solutions for applied loads greaters than 100N. Any idea about what I am leaving back? Large displacement it is selected and not contact simulation (is just one turn of wire, contact doesn't exist).

Regards.