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I had forgotten to post the results, but here they are. The problem was with the boundary conditions, it was overconstrained. Now the Plate Mesh and the Femap give me the same results, the difference with the reference article I believe it’s because one use Ritz method and the other use finite...

First, I checked if the transverse shear was affecting the Plate Mesh model, as you said. The eigenvalue increased when I multiplied the G13 and G23 per 10. So I reduced the thickness until the transverse shear no longer affected the eigenvalue. That way the difference with the reference article...

So the classical solution is not accurate for some angles. In my model, I used 2D orthotropic (MAT8) for the material and PCOMP for property card. I also used the Linear Buckling analysis default on Femap (SOL 105). The graphic is a little different from the first that I sent here cause I...

Hi again! So a used your Plate Mesh program and the results were quite well, following the tendency and with a peak at 45°. I also checked the ABD matrices of my model on Femap, they were like you said: the D16 – D26 and A16 – A26 increases with the ply angle until get to 45°, where they are...

Hello! I'm an engineering student and I’m trying to learn about laminate plate buckling with FEM analysis, so I did the finite element model and used the linear bifurcation analysis (linear buckling - LBA), but the results are not as expected, according to the reference article that I was...