December 11, 2018 at 3:29 pmLisDebSubscriber
I have a model (made up of solids with 3 degrees of freedom at each node) from which I extracted the stiffness (and mass) matrix unsing APDL Math commands:
This works, however when I tried multiplying the stiffness matrix with the displacements I got from a static solution (I got the displacements in all 3 directions from list results--> nodal solution) to make sure this corresponds to the external force vector, it occured to me that the node ordering cannot be consistent since almost every node has a nonzero value, while I only applied loads on two nodes.
Does this have to do with the fact that *DMAT works with BCS ordering (https://www.sharcnet.ca/Software/Ansys/17.0/en-us/help/ans_apdl/apdldofordering.html) while the displacement exports that i got have a different nodal ordering? how can I transform the stiffness matrix in order to make it match the displacement results I exported?
December 12, 2018 at 2:46 pmSandeep MedikondaAnsys Employee
Can you check out example 4.2 in the ANSYS Parametric Design Language Guide? *SMAT with NOD2BCS looks like what you need.
Please do not share any sharcnet links. Use ANSYS Help or the Help Packaged with your installation. I also recommend you to upgrade to 19.2.
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