Hi, i have developed a FEM program for MATLAB, but i keep getting twisted mode shapes, starting from mode one. i suspect i could be the K-matrix, but i cant find the mistake. Hope someone has had a similar problem and might now the answer.
I have added the MATLAB-code for the Hexahedron solid-8 element, where figure two depicts the incorrect mode shape.
in the main script: ''Beam_Hexahedron_element_experiment_ny'', line 190 , the code-piece where i select which mode shape to plot: U1(Fdof)=V1(:,1); , here V1 is the matrix containing the sorted mode shapes.
Michael Kihl
Hi Joerg,
I'm embarrassed to admit that I've uploaded the wrong code.
Thank you very much for making me aware of it. I have corrected it so know the right files should be attached.
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