You can do this by following this Ansys how to video:
Export the ANSYS Stiffness and Mass Matrix to Text Files - YouTube
Also, have a look at this blog for more information. Hope this helps.
APDL Math–Access to the ANSYS Solver Matrices with APDL - PADT (padtinc.com)
Guidelines for Posting on Ansys Learning Forum
How to access ANSYS help links
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