Issue 57

S. Derouiche et alii, Frattura ed Integrità Strutturale, 57 (2021) 359-372; DOI: 10.3221/IGF-ESIS.57.26

       u N q

(1)

where:

    1 1 2 2 3 3 4 4 5 5 1 2 1 2 1 2 1 2 1 2 , , , , , , , , , t q u u u u u u u u u u 

(2)

{q} t is the vector of nodal displacements and [N] is the matrix of interpolation functions for displacements.

Figure 1: Different stages for the mixed finite element formulation.

The shape functions are:

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