Hi
I am trying to recover the stress base on the Tet4/10 elements. The
quadrature rule for element tet4 seems quite confusing, could anyone give me
an explanation?
For example, If the quadrature order is SECOND,
the quadrature points have only 3 Tetrahedral coordinates, and the sum of
all the weights are far less than 1.
I noted one of the comments in quadrature_gauss_3D.C, the tetrahedral
quadrature rules are taken from pg. 222 of "The finite element method" vol.1
ed.5 by Zienkiewicz & Taylor,
so I checked the details in the book. I find that for each of the quadrature
point, there are 4 tetrahedral coordinates and the sum of the weights are
equal to 1.
Thanks in advance for help.
Best wishes,
yunfei
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