Hi,

I modified my model generation according to your proposal. I now have the following models and result files:

`! Static:`

! LSSOLVE,101,104,1

model_sol_static.cdb

model_sol_static.rst

model_sol_static.s101

model_sol_static.s102

model_sol_static.s103

model_sol_static.s104

! Buckling:

! LSSOLVE,20X

model_sol_buckling_ls201.cdb

model_sol_buckling_ls201.rst

model_sol_buckling_ls201.s201

model_sol_buckling_ls202.cdb

model_sol_buckling_ls202.rst

model_sol_buckling_ls202.s202

model_sol_buckling_ls203.cdb

model_sol_buckling_ls203.rst

model_sol_buckling_ls203.s203

model_sol_buckling_ls204.cdb

model_sol_buckling_ls204.rst

model_sol_buckling_ls204.s204

! Modal:

! LSSOLVE,30X

model_sol_modal_ls301.cdb

model_sol_modal_ls301.rst

model_sol_modal_ls301.s301

model_sol_modal_ls302.cdb

model_sol_modal_ls302.rst

model_sol_modal_ls302.s302

model_sol_modal_ls303.cdb

model_sol_modal_ls303.rst

model_sol_modal_ls303.s303

model_sol_modal_ls304.cdb

model_sol_modal_ls304.rst

model_sol_modal_ls304.s304

I imported all in the Select Run Decks dialog. The primary run deck is the static analysis. Buckling and modal solutions are selected as additional rund decks. So far, so good.

Again, I defined FEA Constraints in HyperFEA: Displacement constraints, eigenfrequency constraints and buckling constraints on the displayset of the overall model. I use effective laminates in my model. Since the bending stiffness of an effective laminate is computed as a smeared value from the membrane stiffness I defined all constraints to act on A11,A12,A66 and not the bending stiffness terms. Additionally I activated Stiffness Requirement, Membrane in the Failure Tab.

One improvement: The results of the modal analysis now shows up in the Iteration Report with the correct value.

Unfortunately, I can't get the buckling solution to show up. The buckling analyses with ANSYS are performed for all load steps. In the ANSYS log-files, the eigenvalues are given so I guess they are also present in the rst-file, but the result just won't show up.

Is there something else I have to toggle on in the Failure Tab or somewhere else?

UPDATE:

I tried everything with the buckling constraints, Aij, Dij, Stiffness Requirement Membrane, Stiffness Requirement Bending. If I only active the global buckling constraint, nothing happens: no eigenvalue, no Required Values for the stiffness terms in the Properties tab.

CDB-files for buckling and modal analysis are exactly identical, except the last lines, e.g. for load case 101=201=301:

Modal/eigenfrequency:

`/GO`

FINISH

/SOLU

ANTYPE,2

MODOPT,LANB,3,0,200

LSSOLVE,301

FINISH

Buckling:

`/GO`

FINISH

/SOLU

ANTYPE,0

PSTRES,ON

LSSOLVE,201

FINISH

/SOLU

ANTYPE,1

BUCOPT,LANB,3,0,100,RANGE

LSSOLVE,201

FINISH

The load step files *.s201 and *s.301 are completely identical. I know, I would not need the loads for the modal analysis, but they do no harm.