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Interpretation of buckling results

Interpretation of buckling results

Interpretation of buckling results

(OP)
Hello!

I'm running a linear buckling analysis of a curved shell submitted to pressure load.
I would like to check if there is snap through. It is pinned all around the edges.

Looking at the first mode shape, it looks like a snap through shape, so if the buckling factor is lower than 1 means there is snap through?

I also want to try a non linear buckling analysis. I created a ramp function (vs time, 0 to 1) ,and ran a non linear static analysis with the pressure function of time using the function created.
However, I'm not sure how to interpret the results. Should they match what I have for linear buckling?

Then, is there any knock down factor to be chosen further to a buckling analysis (on Young's Modulus?)

I've included a picture of the first buckling mode, illustrating the model I have.

Many thanks for your help!

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