JoshPlumSE
Structural
- Aug 15, 2008
- 10,172
I thought I learned (way back in my college days) that the "drilling degree of freedom" for plate elements was not included in a proper plate / shell element formulation. As a work around, I have always drawn in a series of frame elements at that location to convert the drilling moment into in-plane forces on the mesh of shell elements.
But, more recently, I've been exposed to a number of programs that now include the drilling DOF as part of their formulation. Programs that are widely used and which I respect.
Can someone explain to me what I'm missing?
Is this truly a robust handling of that degree of freedom? Or, is this merely a "back door" method of preventing instabilities for membranes? Where we really still have to use the in this direction, but where we still have to use the frame element work to get truly accurate results?
But, more recently, I've been exposed to a number of programs that now include the drilling DOF as part of their formulation. Programs that are widely used and which I respect.
Can someone explain to me what I'm missing?
Is this truly a robust handling of that degree of freedom? Or, is this merely a "back door" method of preventing instabilities for membranes? Where we really still have to use the in this direction, but where we still have to use the frame element work to get truly accurate results?