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How to setup a fatigue analysis using acceleration as load?

Hi,

I'm trying to run a fatigue analysis using acceleration as load, but I don't know how to set the FATLOAD card with an acceleration load. My objective is to simulate a shacker test and verify the life and damage that the part will get when vibrates in 1G acceleration.

Modal and frequency response analysis are ok, my only problem is with the fatigue analysis.

If anyone knows how to proceed, please let me know.

Thanks!

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Altair Forum User

Hi @mdrehmer

You can refer a Transient load case (with acceleration as load) in FATLOAD.

mdrehmer

Hi Prakash,

What if I use a GRAV load as LCID in FATLOAD and a TABFAT in TID with the shaker profile?

When you say a transient load case, it is to do a Transient modal analysis and use the RLOAD2 card with the acceleration as load(DLOAD)?

Altair Forum User

What if I use a GRAV load as LCID in FATLOAD and a TABFAT in TID with the shaker profile?

This should do and the GRAV load should be used is a linear static subcase.

mdrehmer

It did not work. I believe that if I'm simulating a shaker, I need a 'Excited load' to apply. GRAV card use a SPC constraint, so it seems that when I put the shaker profile in the TID, nothing happens, the simulation runs but no damage is calculated.