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Hi all,

How to perform post-buckling analysis using ABAQUS correctly?

I have obtained an eigenvalue from a linear analysis using BUCKLE command. The shape from mode 1 is good (tally with the physical experiment).



However, the result from the post-buckling analysis (using IMPERFECTION command and RIKS analysis) has not produced the buckling shape like the mode 1 from the linear analysis.



If you all have any suggestion, please share it with me. Greatly need it.



Thanks,



Wanbot 

Hi,

Can anyone please tell me the constitutive or the 'C' matrix  for a linear viscoelastic material model (with no relaxation in bulk)? I have been using the one outlined in the Computaional Mechanics book by Simo and Taylor, but I feel that ANSYS is using a different matrix as my results are different from ANSYS. I could not find details about the 'C' matrix for a viscoelastic material anywhere else. Any links too might be helpful.

Thanks,

Shriram

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Hi,

     I am trying to model a piezo disc bonded to a steel plate for lamb wave simulation. I am currently modeling the piezos as rectangular with nodes coincident with the plate nodes and just coupling them. I would like to do that with a circular geometry for the piezos, but for that I need to define nodes in the disc that coincide with the plate nodes. How can I do that? Can I define my own node locations in a volume for meshing? Thanks in advance for your help.

Muhammad Haroon