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PCOMP Damping Properties

PCOMP Damping Properties

(OP)
Hi,

I'm creating a laminate in PATRAN with two different materials with different damping coefficients (0.001 and 0.1):

$ Material 1
MAT1     1      7.+10           .3      2700.                   .001

$ Material 2
MAT1     2      5.+10           .4      700.                    .1 

When looking into the PCOMPG card created in the .bdf, PATRAN has simply calculated an average with respect to the thickness (0.067) of both the damping coefficients (what doesn't seem to make any sense), as shown below:

PCOMPG   1                                              .067
         1       1      .001     0.      YES
         2       2      .002     0.      YES 

What can I do to get a reasonable equivalent damping coefficient for the laminate created? Should I work instead with complex stiffness for both materials?
Thanks in advance.

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