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IV.1.2 Satellite FEM materials and properties

In the satellite FE model, only seven material cards are defined. The most relevant parameters of material cards are given in Tables IV.1.1, IV.1.2 and IV.1.3.


Table IV.1.1: Isotropic materials used in the finite element model (MAT1 property cards).






Material name MIDE (GPa)να (K-1)ρ (kg/m3)












Al-7075-T7351 2 72.1 0.33 23.6 10-6 2796.0






Al-7010-T7451 1 71.7 0.33 23.6 10-6 2820.0






Al-2024-T3 clad 3 69.0 0.33 23.6 10-6 2768.0






(thermo-elastic) 5001 72.1 0.33 23.6 10-6 0.0








Table IV.1.2: 3D anisotropic materials used in the finite element model (MAT9 property cards).



Material type Honeycomb 50 Honeycomb 72






MID 5 6



G 11 (MPa) 0.670 0.760



G 22 (MPa) 0.670 0.760



G 33 (MPa) 669.0 1276.0



G 44 (MPa) 0.207 0.310



G 55 (MPa) 138.0 193.0



G 66 (MPa) 310.0 483.0



ρ (kg/m 3 ) 50 72



α (K -1 )23.6 10-623.6 10-6





Table IV.1.3: 2D anisotropic materials used in the finite element model (MAT8 property card).



Material type Honeycomb 50 2D CFRP 2D






MID 4 10000



E 1 (MPa) 0.500 290000



E 2 (MPa) 0.500 5600



ν 12 0.3 0.33



G 12 (MPa) 0.500 3000



G 1Z (MPa) 310.0 1100



G 2Z (MPa) 138.0 1100



ρ (kg/m3) 50 1670



α1 (K -1 )23.6 10-6- 1 10-6



α2 (K -1 )23.6 10-631 10-6



S 1t (MPa) 0.050 1600



S 1c (MPa) 0.050 500



S 2t (MPa) 0.050 25



S 2c (MPa) 0.050 140



S s (MPa) 0.050 55




All CBAR elements receive PBARL properties:

All skins, except those of bottom panel, are made of Aluminum 2024 T3 and have a thickness of 0.5 mm. The honeycomb used in sandwich panels has a density of 50 kg/m3. Only in the +Z panel of the box a 72 kg/m3 honeycomb has been used. The bottom panel is modeled with surface elements, and has correspondingly a PCOMPG property card (PID=6). Each skin of the bottom sandwich panel is made of CFRP laminated material with plies 0.1 mm thick. The properties are defined as follows:

PCOMPG    6                  50.779    30.+6    HILL    20.        0.  
            2008     10000  1.-4      0.        YES  
            2007     10000  1.-4      45.      YES  
            2006     10000  1.-4     -45.      YES  
            2005     10000  1.-4      90.      YES  
            2004     10000  1.-4      90.      YES  
            2003     10000  1.-4     -45.      YES  
            2002     10000  1.-4      45.      YES  
            2001     10000  1.-4      0.        YES  
            100      4        .0284     0.        YES  
            3001     10000  1.-4      0.        YES  
            3002     10000  1.-4      45.      YES  
            3003     10000  1.-4     -45.      YES  
            3004     10000  1.-4      90.      YES  
            3005     10000  1.-4      90.      YES  
            3006     10000  1.-4     -45.      YES  
            3007     10000  1.-4      45.      YES  
            3008     10000  1.-4      0.        YES

For sandwich panels modeled with solid elements, the honeycomb is oriented in such a way that the direction Z is perpendicular to the panel. Direction X is vertical for vertical panels and oriented towards +X of coordinate system 1001 for horizontal panels.