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This is a general purpose tetrahedral element (1 integration point). The shape functions can be found in [34]. The node numbering follows the convention of Figure 17.
Figure 17:
4-node tetrahedral element
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This element is included for completeness, however, it is not suited
for structural calculations unless a lot of them are used (the element
is too stiff). Please use
the 10-node tetrahedral element instead.
guido dhondt
2005-02-26