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).
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Material name | MID | (GPa) | | () | () |
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Al-7075-T7351 | 2 | 72.1 | 0.33 | | 2796.0 |
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Al-7010-T7451 | 1 | 71.7 | 0.33 | | 2820.0 |
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Al-2024-T3 clad | 3 | 69.0 | 0.33 | | 2768.0 |
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(thermo-elastic) | 5001 | 72.1 | 0.33 | | 0.0 |
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Table IV.1.2: 3D anisotropic materials used in the finite element model (MAT9 property cards).
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Material type | Honeycomb 50 | Honeycomb 72 |
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MID | 5 | 6 |
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(MPa) | 0.670 | 0.760 |
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(MPa) | 0.670 | 0.760 |
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(MPa) | 669.0 | 1276.0 |
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(MPa) | 0.207 | 0.310 |
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(MPa) | 138.0 | 193.0 |
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(MPa) | 310.0 | 483.0 |
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() | 50 | 72 |
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() | | |
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Table IV.1.3: 2D anisotropic materials used in the finite element model (MAT8 property card).
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Material type | Honeycomb 50 2D | CFRP 2D |
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MID | 4 | 10000 |
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(MPa) | 0.500 | 290000 |
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(MPa) | 0.500 | 5600 |
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| 0.3 | 0.33 |
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(MPa) | 0.500 | 3000 |
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(MPa) | 310.0 | 1100 |
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(MPa) | 138.0 | 1100 |
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() | 50 | 1670 |
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() | | |
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() | | |
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(MPa) | 0.050 | 1600 |
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(MPa) | 0.050 | 500 |
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(MPa) | 0.050 | 25 |
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(MPa) | 0.050 | 140 |
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(MPa) | 0.050 | 55 |
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All CBAR elements receive PBARL properties:
- For the traversing elements representing the inserts in sandwich panels, one assumes a
cylinder of 16 mm diameter. The material is Al 7010 T7451.
- The bars of metallic frame receive Al 7010 T7351 material and have a tubular
cross-section with 26 mm and 30 mm internal and external diameters respectively.
- The bars of struts receive Al 7010 T7351 material and have a tubular cross-section with
46 mm and 50 mm internal and external diameters respectively.
- Finally, when RBE2 elements are replaced by very stiff CBAR elements for
thermo-elastic calculations, one attributes the fake material 5001 to the CBAR elements.
This material is equivalent to Al 7010 T7351 but has no density. The bar cross-section
is assumed to be a rod of 30 mm diameter.
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
. Only in the +Z
panel of the box a 72
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.