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rebounded height is not correct (ansys/ls-dyna)

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dovil

Mechanical
Oct 17, 2012
6
US
Dear Friends,

I have a problem when simulation a drop test in ANSYS/LS-DYNA.
I was trying to drop a flat plate with linear elastic material properties, but the first rebound height is always as high as the original drop height, or even a little bit higher, but after two or three rebounds the plate finally stay still on the ground which means the energy was dissipated now.
But what I confused is: since I did not define any damping or friction, why was the energy dissipated? The plate is supposed to move all the time, isn't it?

Then, I switched to using bilinear isotropic material properties, but got the same results.

So, does any of you know how to define a good drop test? I do not want the structure to rebound to the same height, because it is impossible in a real case.

Thanks a lot in advance.

Bests,
 
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