527x
000842
2017-12-01

Question

Sometimes I obtain negative critical load factors in RF‑STABILITY. How do I evaluate them?


Answer:

For negative eigenvalues, no stability failure occurs due to the tensile forces in the model. It is not possible to make a prediction about the buckling behavior that can be expected.

If negative critical load factors are shown, you should increase the number of stability modes to be determined. If the number is too small, it is not possible to hide the negative eigenvalues in order to display only the positive, realistic results.

As an alternative, you can use the ICG eigenvalue solver method to exclude the negative critical load factors.