Resonant Bending Fatigue Test Modeling

[tayron]

Hello everyone.

I'm new in this forum and also in abaqus analysis.

I'm trying to model a resonant bending fatigue test in abaqus but I have some problems.

The experimental test has an eccentric mass at the pipe tip which rotates, generating the pipe oscillation.

First I used a linear perturbation-frequency step to check the natural frequency and the nodes positions for the first mode.

Then, I tried to use "steady state dynamics, direct" step (with a frequency close to the natural frequency) and applied a downward force equal to the centripetal force (caused by the mass) at the pipe tip .

However, I'm not sure if its the right way to model that, since I'm not familiar with this kind of simulation.

What I need as a final response is the stress levels and the aceleration so I can compare with experimental data.

Can someone help me with that?

Thanks in advance.

 

[Mustaine3]

Abaqus is not a fatigue tool.

When you do a SSD, you apply a harmonic load and you get the harmonic response. Damping is an important factor for the result.
I recommend you take closer look into the Users Manual and maybe the Getting Started first.

 

[tayron]

Thanks for your response Mustaine3.

My idea is to simplify the physics behind the test so I can run it on Abaqus and compare to the strain levels an aceleration obtained experimentally.

As I said before, I don't know much about SSD.

I didn't find any good example explaining how SDD and the damping fraction works, even in the manual.

Am I in the right way for this modeling using SSD?

Thanks