I am trying to obtain the eigenvalues of the global stiffness matrix in abaqus. I am able to extract the stiffness matrix using the input file and use MATLAB to obtain the eigenvalues. But I want to run the model in a loop by varying the loading; hence, require the eigenvalues to be extracted in the abaqus file itself.
I need help with the python code for the problem. Thanks in advance
Saad Najeeb I need to run the simulation in a 'for loop' by incrementing the loading applied. Is there a way to run a loop by incrementing the loading in abaqus and simultaneously analysing the eigenvalue in matlab?
Thank you Saad Najeeb for the help.
I found the solution for the problem by combining matlab and abaqus. Although the solution does not exactly solve the problem of extracting the eigenvalues in abaqus PDE but it does the same job in a different method. The method has been explained below for future references. Refer to the cae file attached below for the problem statement.
I used matlab to call abaqus and solve the job using dos, following which Abaqus2Matlab toolbox was used to extract the stiffness matrix from the .mtx file. The 'eig()' command in matlab can be used to extract the eignevalues of the stiffness matrix. After this, the input file can be modified in matlab. I incremented the horizontal pressure by 1 magnitude for every loop.
The input file and the matlab file have been attached below. Please ensure installation of abaqus2matlab toolbox before running the files.
References
1) http://www.abaqus2matlab.com/
2) https://in.mathworks.com/matlabcentral/answers/62986-how-to-change-a-specific-line-in-a-text-file
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