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Recent content by Michael_ZY

  1. Michael_ZY

    eigenvalue/eigenvector of tangent stiffness in abaqus

    Hi Mustaine, thanks for your good question. Originally, I want to find the bifurcation point or limit point of snapping process where the eigenvalue of tangent stiffness is equal to zero and the corresponding shape is related to eigenvector. And the eigenvalue and eigenvector of tangent...
  2. Michael_ZY

    eigenvalue/eigenvector of tangent stiffness in abaqus

    Hi,IceBreakerSours. You are right, you can also switch it to dynamic analysis at the critical point (snapping point).
  3. Michael_ZY

    eigenvalue/eigenvector of tangent stiffness in abaqus

    Hi,IceBreakerSours Thanks for your reply. I do not exactly understand your point because I think inertia and mass is not needed for static analysis. For the snap-through behaviors, in experiment, structure will snap at critical point, which means dynamic problems kick in. But here I just...
  4. Michael_ZY

    eigenvalue/eigenvector of tangent stiffness in abaqus

    Mustaine,thanks! what I want is the eigenvalue and vector of tangent stiffness matrix, so it should be solved like (K – λ I) ψ=0, where K is the tangent stiffness matrix, λ- eigenvalue, I- identity matrix, ψ- eigenvector... But if I do frequency analysis for each configuration, it will...
  5. Michael_ZY

    eigenvalue/eigenvector of tangent stiffness in abaqus

    Dear Mustaine, Thanks for your reply. One thing I was confused about frequency analysis. Because what I did originally was static analysis, it has nothing to do with mass. So if I did frequency analysis as you suggested, how to deal with mass, and how much mass should I assign? The value of...
  6. Michael_ZY

    eigenvalue/eigenvector of tangent stiffness in abaqus

    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?
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