?? tetrahedronelementpstresses.m
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function y = TetrahedronElementPStresses(sigma)
%TetrahedronElementPStresses This function returns the three
% principal stresses for the element
% given the element stress vector.
% The principal angles are not returned.
% Copyright, Yingchun Zhang, 09/13/2006
s1 = sigma(1) + sigma(2) + sigma(3);
s2 = sigma(1)*sigma(2) + sigma(1)*sigma(3) + sigma(2)*sigma(3) - sigma(4)*sigma(4) -sigma(5)*sigma(5) -sigma(6)*sigma(6);
ms3 = [sigma(1) sigma(4) sigma(6) ; sigma(4) sigma(2) sigma(5) ; sigma(6) sigma(5) sigma(3)];
s3 = det(ms3);
y = [s1 ; s2 ; s3];
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