Calculating Tetrahedral Stiffness Matrix for FEM
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I'm writing some FEM simulations and have the mesh sorted.
I'm now putting the stiffness matrix together and feel that this is such a generic task that surely it's already been done - but after a quick google and look through the file exchange it appears not! There are a few things that mention trusses and things but nothing that takes an obvious input and gives a straightforward stiffness matrix.
Does anyone know of any good code that takes a mesh tetrahedralisation matrix T(Ne,4) and set of vertices V(Nv,3) and produces the linear stiffness matrix K(Nv,Nv)? Obviously higher orders would also be great but linear is enough to get started.
2 Commenti
Jason Nicholson
il 29 Dic 2020
I am not aware of any automatic global stiffness matrix generator. I think you have to role your own. That is all I have. Maybe, someone who studies this will comment. However, most FEA code writer don't work in MATLAB except for high level interface. FEA is written in C and C++.
Risposte (1)
Nathan Welch
il 29 Dic 2020
1 Commento
Biswabhanu Puhan
il 30 Mar 2023
Thank you Mr. Welch, did you find the formulation for 2nd order element (C3D10 in abaqus)? Kindly please let me know.
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