Topology Optimization - How the element matrix is constructed from line 86-99.?

THIS IS THE CODE FOR ELEMENT MATRIX . HOW THE SMALL k i.e. row matrix is constructed. HOW IT IS ONLY DEPEND ONLY ON nu(POISSION RATIO).

function [KE]=lk

E = 1.;

nu = 0.3;

k=[ 1/2-nu/6 1/8+nu/8 -1/4-nu/12 -1/8+3*nu/8 -1/4+nu/12 -1/8-nu/8 nu/6 1/8-3*nu/8]

KE = E/(1-nu^2)*[ k(1) k(2) k(3) k(4) k(5) k(6) k(7) k(8)

k(2) k(1) k(8) k(7) k(6) k(5) k(4) k(3)

k(3) k(8) k(1) k(6) k(7) k(4) k(5) k(2)

k(4) k(7) k(6) k(1) k(8) k(3) k(2) k(5)

k(5) k(6) k(7) k(8) k(1) k(2) k(3) k(4)

k(6) k(5) k(4) k(3) k(2) k(1) k(8) k(7)

k(7) k(4) k(5) k(2) k(3) k(8) k(1) k(6)

k(8) k(3) k(2) k(5) k(4) k(7) k(6) k(1)]

end

Answer 1

[SaiDileep Kola]

I don't get the specific issue you are facing problem with, still it may be solved by going through article attached here.