Tetrahedral Element

Calculates the determinant of jacobian and deformation matrix (B) of tetrahedral element in finite element analysis

This function finds the determinant of the jacobian and deformation matrix (B) of four nodes tetrahedral element in finite element analysis:

function [J_det, B]=tetra4(V,r,s,t)

%Input
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V: (4*3) Vertices coordinate matrix. The rows represent each node and columns x-coordinate ,y-coordinate and z-coordinate.
r,s and t: Values of natural coordinates at the location of integration point.

Output:
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J_det: Determinant of the jacobian
B: Deformation Matrix