Topology Optimization - How to apply load at different nodes

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Sagar Gupta Satrasala
评论： Sagar Gupta Satrasala 2021-3-14
I am working on a standard code for the topology optimization of a MBB beam as in the figure.The force has to be defined at the upper left corner. The design domain is descretized into finite elements, say 100 elements in the x-direction and 10 elements in the y-direction. Both node numbers and element numbers are numbered column wise from left to right.Now, I want to change the position of code the midpoint of right side end of the beam. How do I do that?

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Anderson Pereira
Anderson Pereira 2021-1-27
Hi Sagar,
If you are refering to the 99-line code, available at https://www.topopt.mek.dtu.dk/Apps-and-software/A-99-line-topology-optimization-code-written-in-MATLAB, the corner nodes are labeled as
upper left corner = 1
bottom left corner = nely+1
upper right corner = (nelx)*(nely+1)+1
bottom left corner = (nelx+1)*(nely+1)
Finally, considering that nely is even, the middle node of the right edge is
midpoint = (nelx)*(nely+1)+1+nely/2
Best,
Anderson
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Anderson Pereira
Anderson Pereira 2021-2-3
Hi Sagar,
Lines 37–48 are related to the Optimality criteria based optimizer. Please take a look at the code article:
Sigmund, O. A 99 line topology optimization code written in Matlab. Struct Multidisc Optim 21, 120–127 (2001). https://doi.org/10.1007/s001580050176
Best,
Anderson
Sagar Gupta Satrasala
Sagar Gupta Satrasala 2021-3-14
Hi,
I am trying to calculate stress at each element of the beam in the same code and included the code to calculate that inside the while loop(lines 46-48). But I am getting very high stress values. Can anyone please help me to find the reason for that,

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