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eigenvalue/eigenvector of tangent stiffness in abaqus

eigenvalue/eigenvector of tangent stiffness in abaqus

eigenvalue/eigenvector of tangent stiffness in abaqus

(OP)
Hi,

I was doing snap-through problem with abaqus in static nonlinear setting. I got the load-deflection curve corresponding to snap behavior. But I want to ask for the eigenvector and eigenvalue of tangent stiffness for each configuration(each point on the curve), do you know how to do it?

RE: eigenvalue/eigenvector of tangent stiffness in abaqus

I see two options:

1. One large analysis. So push a little bit in a nonlinear static analysis step, then add the frequency step. The adding another static step with a little bit additional load, then another frequency step. And so on. The eigenfrequencies and -vectors are always based of on the result of the previous nonlinear step.

2. Run the full static analysis as now, but save restart data during the analysis. Then do restart or import analysis from each point and do a frequency analysis each time.

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