...
Condition 4
|ν2|<1
Condition 5
...
|ν21|<(E2/ E1)1/2
Condition 6
...
|ν12|<(E1/ E2)1/2
Condition 7
...
1-ν22-2ν12ν21-2ν2ν12 ν21>0
3D Orthotropic Materials:
Condition 1
Ex1>0
Condition 2
Ey2>0
Condition 3
Ez3>0
Condition 4
Gxy12>0
Condition 5
Gxz13>0
Condition 6
Gyz23>0
Condition 7
...
|ν12|< (E1/ E2)1/2
Condition 8
...
|ν13|<(E1/ E3)1/2
Condition 9
...
|ν23|<(E2/ E3)1/2
Condition 10
...
1-ν12ν21-ν23ν32-ν13ν31-2ν21 ν32 ν13>0
Condition 11
...
ν21 = (E2/ E3)v12
Condition 12
...
ν31 = (E3/ E1)v13
Condition 13
...
ν32 = (E3/ E2)v23