Noting that i'm using 4 nodes quadrilaterlal linear elements and i have nodal displacements.
See this article, it might help you:
https://www.uotechnology.edu.iq/dep-production/laith/An%20approach%20to%203D%20surface%20curvature.pdf
Just take quadratic form which gives the best approximation in the sense you chose to the nodal data you have.
Source to get Impact factor of journals
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