Hello;
I have a problem of extracting structural damping coefficient of a sandwich plate type steel / polymer / steel. I have already entered the shear modulus of the polymer in ABAQUS G = G0 (iw) / (1 + iw) With the: *viscoelastic, frequency=TABULAR
I do not know if my approach is right?
My inp file has this form:
*NODE, NSET=ALLNODES, SYSTEM=R
..
*ELEMENT, TYPE=S4 , ELSET=THIN-SHELL1
..
*SHELL GENERAL SECTION,
ELSET=THIN-SHELL1 ,
COMPOSITE
0.000762,3,Mat_COUCHE-1-3
0.000254,3,Mat_COUCHE-2
0.000762,3,Mat_COUCHE-1-3
*MATERIAL,NAME=Mat_COUCHE-1-3
*ELASTIC,TYPE=ISOTROPIC
68.9E+9, 0.3
*DENSITY
2740.0,
*MATERIAL,NAME=Mat_COUCHE-2
*viscoelastic, frequency=TABULAR
29966703.66 , 998890.1221 ,,, 30
59983337.96 , 999722.2994 ,,, 60
..
*DENSITY
999.0,
*ELSET, ELSET=ALLELEMENTS
THIN-SHELL1 ,
*BOUNDARY
*STEP,INC=10
*FREQUENCY, EIGENSOLVER=LANCZOS
20
*MODAL DAMPING,MODAL=COMPOSITE
1,20
*MODAL FILE
*MODAL PRINT,FREQUENCY=1
*END STEP
**
Thank you for your help