what values to be used for *Surface Behaviour in ABAQUS

[dogbural82]

Dear all,

Currently im analysing the dynamic impact onto composite panel. However, compared to experimental results, FE analysis over-predicts in terms of contact force. So now im trying to have soften contact behaviour using *Surface Bahavior with PRESSURE-OVERCLOSURE=EXPONENTIAL. However, I do not have any clue what values I have to put for this contact card. According to the abauqus documentation, it says that 1st column should be clearance ( does it mean the initial distance b/w an impactor and the target) and 2nd column Pressure at zero clearance, etc. Should I put any arbitrary values or is there any equations that I need to follow?

Regards,
Minki

 

[RGX124]

If you do not have any "physical" clue of the values, I d suggest that you enter some random (but realistic) values and that you analyse their effect on the global solution (Impact force).
That will lead you either to inverse identification of the parameters or to see that your problem is somewhere else.