Eigenvalue Buckling of thin walled cylinders and stiffened cylinders
i try to run some design Optimizations for a cylinder. Therefore i want to compare different stiffner typs and a unstiffened version. When i try to run the unstiffened Version, i alwys got the same total deformation(1;1,0001m) for several r/t(radius/wall thickness) ratios.When i try to simulate thin walls, Ansys can't "Performe Mode Extraction"(radius=750 thickness <20mm). I tried some settings explained in the Help-Section: Checking all specific settings for linear buckling, changing the solver to Subspace(default for linear is Direct) both didn't work.
Loads and Boundary conditions:
acceleration in axial and radial direction
fixed support on one front face
i turned of negative Load Factors
It did worked before, but there i mixed the Units for my Youngs' Module. (Now GPA then MPA->Factor 1000 more now)