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MAT LAW 25 with transverse isotropy

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i have a FRP with the following elastic parameters: E1, E2, G12, nu12.

The parameters needed in the material card are E11, E22, E33, NU12, G12, G23, G31.


E11 = E1

E22 = E2

E33 = E2

NU12 = nu12

G12 = G12

G23 = ?

G31 = ?


How do i find the missing two shear modulis?


Thank you very much for your help!

Kind regards

Tim Winkler

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Hi @mrtimwinkler


There are different ways to calculate the shear modulus, for example, Semi-empirical Halpin-Tsai equation for shear modulus.


I would suggest you refer literature available online. 

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