Radioss impact simulation on solid component: how to dampen the material oscillations after the impact?

Demos Dimakopoulos
Demos Dimakopoulos Altair Community Member
edited September 20 in Community Q&A

I am running an impact analysis on Radioss. I'm using a solid surface, with aluminium material and LAW 2, Isolid:14 and Ismstr: 2.
After the impact of the rigid wall, the impact face of the component keeps oscillating. How can I dampen out these oscillations without messing with the results?

I am thinking of using Rayleigh Damping with different alpha/beta values, and then also check KEREL and/or ADYREL.

Any suggestions?


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Answers

  • PaulAltair
    PaulAltair
    Altair Employee
    edited September 16

    Are you sure the oscillations are non physical? What is the timeframe/frequency? KEREL would remove the overall motion of the component, so DYREL or DAMP would be better to isolate the required frequency range ADYREL may also work and is the easiest to use.

  • Demos Dimakopoulos
    Demos Dimakopoulos Altair Community Member
    edited September 17
    Paul Sharp_21301 said:

    Are you sure the oscillations are non physical? What is the timeframe/frequency? KEREL would remove the overall motion of the component, so DYREL or DAMP would be better to isolate the required frequency range ADYREL may also work and is the easiest to use.

    Maybe the timeframe is not long enough for the model, I'm running for 50 ms, with the impact happening at 6 ms. 

  • PaulAltair
    PaulAltair
    Altair Employee
    edited September 19
    Demos Dimakopoulos said:

    Maybe the timeframe is not long enough for the model, I'm running for 50 ms, with the impact happening at 6 ms. 

    Perhaps, it can be difficult to visualise sometimes in short timespan, oscillations can look non physical when all you are really seeing is high frequency 'ringing' after impact which would occur in reality too

  • Demos Dimakopoulos
    Demos Dimakopoulos Altair Community Member
    edited September 20
    Paul Sharp_21301 said:

    Are you sure the oscillations are non physical? What is the timeframe/frequency? KEREL would remove the overall motion of the component, so DYREL or DAMP would be better to isolate the required frequency range ADYREL may also work and is the easiest to use.

    Still can't figure the correct alpha and beta for Rayleigh Damping. Also DYREL & DYREL seem to affect also the Rigid Wall, that doesn't bounce back after the impact...

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