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  1. feanalyst2

    How to double check direct stiffness method in Abaqus?

    That is exactly it, I have just run everything with regular elements, and 0.495 Poisson ratio, and I get a perfect match now. Thank you! What is the issue with hybrid elements? Isn't direct stiffness what is used by Abaqus in that case?
  2. feanalyst2

    How to double check direct stiffness method in Abaqus?

    @FEA way: thanks for getting back to me. You can find attached the input file, and the stiffness matrix files generated through both "MATRIX INPUT" and "COORDINATE". Note that the number of nodes I defined through the mesh is 42. Note the presence of the negative nodes in the "MATRIX INPUT"...
  3. feanalyst2

    How to double check direct stiffness method in Abaqus?

    @FEA way, thank you, that's a great point. I am trying replicating another example, with no contact, and prescribred displacement. In doing that, I have a side question: when exporting the stiffness matrix through the input lines in the original post, I always get some nodes with negative...
  4. feanalyst2

    How to double check direct stiffness method in Abaqus?

    Hi everyone, I am trying to double check the direct stiffness method in Abaqus, for the contact between a rigid body and a linear elastic body. What I have done is the following: 1) Create the linear elastic body, and extract its global stiffness matrix K in Abaqus as: ** Output Global Stiffness...

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