Matlab - FEM: Meshing polygon

Question

I have problem with meshing this polygon:

enter image description here

I need fill this polygon with one of this finite element:

enter image description here

I don't how to type a code for this problem and then plot this polygon with mesh, all without using PDEtool.

Thank you.

What kind of FEM solver are you using? Does it do automatic mesh refinement? — knedlsepp, Jan 23 '15 at 20:56
Have a look at the [triangulation class](http://de.mathworks.com/help/matlab/ref/triangulation-class.html). — knedlsepp, Jan 23 '15 at 22:47

score 0 · Accepted Answer · answered Jan 23 '15 at 18:26

0

I made sth like that:

matX = [0,0.2,0;
        0.2,0.2,0;
        0.2,1,0.2;
        1,1,0.2;
        0,0.2,0;
        0.2,0.2,0;
        0.2,1,0.2]

matY = [0,0,0.5;
        0,0.5,0.5;
        0,0,0.5;
        0,0.5,0.5;
        0.5,0.5,1;
        0.5,1,1;
        0.5,0.5,1]

x = zeros(7,4);
y = zeros(7,4);    

for i=1:7    
    x(i,:) = [matX(i,1),matX(i,2),matX(i,3),matX(i,1)];
    y(i,:) = [matY(i,1),matY(i,2),matY(i,3),matY(i,1)];
    plot(x(i,:),y(i,:))
    hold on
end

Mesh:

enter image description here

Have anyone better and more sophisticated solution?

answered Jan 23 '15 at 18:26

MrPitivier

71
9

Looks like a start to me. Now you should do what every FEA practitioner would do: get a solution, refine the mesh, and continue until the answers don't change anymore. It's called "checking convergence". – duffymo Jan 26 '15 at 13:42
I made it all FEM stuff in Matlab. Our HW was like: create a program in Matlab, that will be calculate stress, strain etc similiar to NX, Catia etc. Really terrible HW, but done it, thank you for all your response, help me :) – MrPitivier Jan 27 '15 at 07:49
Terrible HW? Sounds like a great problem. – duffymo Jan 27 '15 at 11:15
Not the best in examination period, a lot of exams. ;) But it is useful HW. – MrPitivier Jan 27 '15 at 12:21

Matlab - FEM: Meshing polygon

1 Answers1