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How to find crirical damping fraction of a viscelastic material?

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Mohit16

Aerospace
Mar 29, 2016
1
Hi,
I am doing visoelastic analysis of sandwich composite plate with viscoelastic core in Abaqus CAE.
I defind the material properties in Prony series form. but now the problem is
In the STEP module, for modal damping analysis,it is asking Critical damping fraction.
and in the Same Module, for complex eigenvalue, it is not showing complex value of frequency in the DAT file.
Can anyone help me
Thanks in Advance,

Mohit
 
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