What is the OptiStruct equivalent of the Nastran K6ROT parameter?

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

What is the OptiStruct equivalent of the Nastran K6ROT parameter?

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2013

    There is none. OptiStruct uses a 6dof shell formulation.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2013

    Hello,

     

    Radioss / OptiStruct don't use the K6ROT Parameter...instead...

     

    In OptiStruct, the shell elements have a built-in drilling stiffness.  Each element’s drilling stiffness is calculated from the element properties using a shape function.  This way, the shell elements in OptiStruct have six degrees of freedom per node, three displacements and three rotations.  The OptiStruct approach is more accurate, since it derives the drilling stiffness from the structural properties of each element.  This leads to somewhat different results between OptiStruct and Nastran for shell models.

     

    Regards,

    Mario

     

    PS: Nastran's K6ROT is very often a source of errors, so i like the Radioss approach

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