Hello all,
I am seeking assistance from individuals with experience in Abaqus for a problem I'm encountering. I am currently working on the development of a buckling analysis for a honeycomb unit cell consisting of a stiff frame (depicted in green in the pictures) and a soft core (depicted in white in the pictures).
While I have been successful in performing the analysis and obtaining valid eigenvalues and eigenvectors in certain cases (like Model-1), I am facing difficulties in other cases (like Model-2), particularly when the core stiffness is significantly lower than that of the frame. In these instances, the linear buckling analysis fails to provide accurate eigenvalues and eigenvectors, which can be positive or negative.
As I intend to optimize a large number of these models, I am reluctant to switch to a different analysis type, as the current approach is faster and better suited for capturing instability points compared to static analysis. I understand that this question may seem simple, but I genuinely appreciate any suggestions that could help resolve the issues I am encountering.
Thank you in advance for your support.
You should define more buckling modes when you analyze the core with low stiffness. It seems to me you have get local buckling mode but you want global buckling mode and maybe the higher eigenvalues will connect to the global mode.
By the way, I recommend this to your attention:
https://www.quora.com/What-is-the-effect-of-getting-one-of-the-eigenvalues-as-negative-in-Abaqus-Is-it-about-stability-Can-anyone-help-me-showing-some-mathematical-calculations
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