An algorithm to calculate shape function values at specific points is presented. It applies to three‐dimensional serendipity elements with variable node numbers per side and, as a particular case, to plane and truss elements. The procedure is shown for the two‐dimensional case using the natural orthogonal reference system of the element and is then generalized to the three‐dimensional case. The source code of the described algorithms written in Fortran 77 is included.
ZAVARISE, G., VITALIANI, R. and SCHREFLER, B. (1991), "AN ALGORITHM FOR GENERATION OF SHAPE FUNCTIONS IN SERENDIPITY ELEMENTS", Engineering Computations, Vol. 8 No. 1, pp. 19-31. https://doi.org/10.1108/eb023824
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