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  1. am1234567

    Calculation of a length using Involute curve

    As shown in the attached figure, a circle with its involute curve has an initial position at 0 degree, and have a length of 'a' which was measured from the y-intercept to the center of the circle. After that, the circle was rotate for 45 degree and now have the length of 'b'. Then it was again...
  2. am1234567

    FATAL MESSAGE 4291 (EQD4S) when using MAT8 for composite

    hi @nlgyro Thank you very much for your help. I don't know why I thought like that. You pointed out the most important things for me. Now the solution had worked just fine. Thank you again. I really appreciate it.
  3. am1234567

    FATAL MESSAGE 4291 (EQD4S) when using MAT8 for composite

    Hi, I have a problem when running Nastran SOL 103 for normal modes analysis which I believe happened when I used MAT8. Some problem arises saying "*** USER FATAL MESSAGE 4291 (EQD4S) FOR ELEMENT WITH ID =1 THE MATERIAL ROUTINE -MAT- RETURNS A 2X2 J-MATRIX FOR MATERIAL ID =1 WHICH IS SINGULAR."...

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