Hello,

I am trying to model a composite sandwich blade, in order to simulate a wind turbine with FAST v8.

First, I am using the stand-alone version of BeamDyn, and Precomp as a pre-processor.

As I read in the documentation, the inputs for the cross-sections of the beam are a 6x6 stiffness matrix and a 6x6 mass matrix. I have some trouble to well fill the stiffness matrix.

Without coupling effects, the stiffness is as given in the BeamDyn manual :

However, the coupling effects are not negligible in my case. Precomp give me coupling terms for the cross sections :

My questions are :

- How to fill the stiffness matrix with these terms ?
- Which are the effects neglicted by Precomp, compared with other preprocessor (BECAS for instance) ?
- I read transverse shearing is neglicted. For isotropic material blade in the BeamDyn stiffness matrix, I give KShrFlp = KShrEdg = GS. Negligible shear transverse does it mean that Precomp cannot give me results for KShrFlp and KShrEdg ?

Thanks fo your help,

Damien Caous