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### Four-node tetrahedral element (C3D4)

This is a general purpose tetrahedral element (1 integration point). The shape functions can be found in [27]. The node numbering follows the convention of Figure 13.

Figure 13: 4-node tetrahedral element

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.