Hello,
I have been trying to generate the mass, stiffness, and damping matrix from an input file for a dynamic case with two steps, an internal pressure and then a force applied to it a set time afterwards. I have been trying to import the code:
** *STEP *MATRIX GENERATE, STIFFNESS, MASS, DAMPING *MATRIX OUTPUT, STIFFNESS, MASS, DAMPING, FORMAT=MATRIX INPUT *END STEP
I however will get an error and the input file won't run. I was wondering if anyone has had similar issues or not.
Thank you.
The primary issue with your approach lies in the incompatibility of the `*MATRIX GENERATE` and `*MATRIX OUTPUT` commands with multi-step analyses. These commands are designed for single-step scenarios to extract system matrices for a specific configuration. To address this, consider creating separate input files for each load case (internal pressure and applied force), using the commands within each file to extract the respective matrices. Alternatively, employ the `*OUTPUT, FIELD, VARIABLE=U` command to extract nodal displacements and post-process them to calculate the matrices.
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