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What is the OptiStruct equivalent of the Nastran K6ROT parameter?
There is none. OptiStruct uses a 6dof shell formulation.
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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