radial force stent crimping

[AliceF]

thread799-356649

Hi to all,
I'm trying to reconstruct a numerical model of two Nitinol stents and I need information about the radial force they exibit.
I have meshed the stent frame models with C3D8R elements and I have considered the UMAT subroutine based on Auricchio and Taylor to reproduce the material properties. In addition, I have built a cylinder (SFM3D4R elements, rigid) around each stent. The diameter of the cylinder is reduced and then re-explanded. I have performed analyses with Abaqus\Explicit 6.13 and they run. Now I have a problem: I want to evaluate the radial force of the each entire stent but I don't know how it is possible to do this. Which is the best way to evaluate it? In several articles I have found force-diameter curves related to the entire model. At now I am only able to evaluate the force in a single point. Which parameters are necessary to trace during the whole simulation to reach my pourpose?
Best regards

 

[CamiS]

Ok, I've done that, but didn't change anything. The variable I was looking at before, was RF1. In cyl coord, I defined R as X, therefore I'm still looking at RF1 and that output hasn't changed.

 

[Dave442]

Are you sure you transformed you data correctly?

In global Cartesian coordinates RF1 = RFX. In polar coordinates RF1 = sqrt(RFX^2+RFY^2) so should be different.

 

[CamiS]

Thanks for pointing it out, Dave. I think it's sorted now.