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  1. Mur_FEA

    Negative terms on the factor diagonal

    Blas, First of all thank you very much for your help, I am also a spaniard! I am just getting introduced to FEA as a student project. I think my main problem is indeed connecting a soft element to a stiff element: I am studying a joint of sandwich panels and aluminium profile. When I use a...
  2. Mur_FEA

    Negative terms on the factor diagonal

    Hello, I have a few questions regarding the negative terms on the factor diagonal error when launching an analysis on nastran. My problem: *** SYSTEM INFORMATION MESSAGE 4159 (DFMSA) THE DECOMPOSITION OF KLL YIELDS A MAXIMUM MATRIX-TO-FACTOR-DIAGONAL RATIO OF 1.247295E+05 ***...

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