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Explicit time integration of shells without "drilling" DOF |
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September 17, 2024, 07:56 |
Explicit time integration of shells without "drilling" DOF
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Member
Anders Aamodt Resell
Join Date: Dec 2021
Location: Oslo, Norway
Posts: 66
Rep Power: 4 |
A number of shell elements have only 5 degrees of freedom (3 translations and 2 rotations). In explicit FEM, it is common to use the central difference method, and for instance in the paper of Belytschko et. al. https://doi.org/10.1016/0045-7825(84)90026-4 it is stated that this method is used.
However, to me it doesn't seem trivial to extend the central difference method for translational DOFs to a setting with rotational DOFs, ESPECIALLY when there are only two rotational degrees of freedom. I have some idea of how this can be done with three rotational DOFs, then you can use an exponential map to update a rotation matrix or quaternion that describes the nodal rotation. If someone has any pointers or sources on how this can be done in the 5 DOF setting, I would be happy to hear it. |
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central difference, drill, rotations, shell |
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