How to export elemental stiffness matrix

[kushwah_dk]

Hi,
I am trying to export elemental stiffness matrix from Abaqus by adding the following lines in the input file
"*Element Matrix Output, Elset=Set-1, File Name=myMatrix, Frequency=1, Output File=User Defined,
Stiffness=Yes" for 4-noded linear quad element.
I got stiffness matrix but the size of this matrix is 12x4 while it should be 8x8.
Could you please explain how the Abaqus is writing the elemental stiffness matrix?
Please check attached output for your reference.

 

[FEA way]

Check the documentation chapter Output —> About Output (paragraph "Element matrix output in Abaqus/Standard"). There you will find some information regarding the syntax of files containing element matrices.

 

[kushwah_dk]

Thank you for the reply.
I have read the documentation and found the format for global matrix as First line
Row node number.
Degree of freedom number for row node.
Column node number.
Degree of freedom number for column node.
Matrix entry.
But for element stiffness matrix (as I attached in the previous message) I did not get any format.
Could you please help me to understand the format of element stiffness matrix? why this is 12x4 why not 8x8?

 

[kushwah_dk]

Hey, I got the answer this is a 8x8 matrix only.
Thank you!!