element 11/12 (7/57 for MSC.Marc) have the same geometry type, i.e. both
are a hexahedral with 8 integration points/cells
Type 11 is linear (8 nodes), type 12 quadradic with reduced integration (20 nodes).
The modified definition ensures that the cell nodes 9-20 of element 11
are in the same order as the real nodes 9-20 of element 12. Real nodes
1-8 (corners) and 21-27 needed no modification.
Notes:
* Documentation on https://damask.mpie.de/Documentation/ElementType is now outdated.
* Element defition in MSC.Marc manual volume B (2001 version) is
confusing because element numbering is sometimes clowise and
sometimes counterclockwise. The latter one seems to be correct
usually, we store per data per cell, i.e. len(shape(x)) == 3 means x is
a tensor.
Due to the use of transposed tensors (due to column-major storage order
in Fortran), we usually want to store the transpose of (3x3) tensors.
Now the default can be changed
Martin Diehl