[ATM] SEC: UNCLASSIFIED:-Plop help

[mdholm at telerama.com (Mark Holm)]

I think this works.  You may get errors when you try to plot the parts, 
but I have usually been able to get the dimensions out anyhow.  The only 
thing is, after you get the errors (usually divide by zero), the program 
doesn't want to work right afterward.   Have to restart to do another run.

You will need to change material, diameter, thickness, etc to fit your 
case.  Copy this into a text editor and save it in your Plop program 
directory as 5_1.gr or something like that.  Then run Plop and open it 
from the File menu.  Then make the material and dimension changes you 
need, then run the optimizer.

I hope Richard S. isn't reading this, cause I know these designs with 
the central support are special to him.  Every time I have tried one in 
Plop, I have found that the "conventional" six point, with six points in 
a circle, gives lower deformations.  Of course, the "conventional" six 
point cells are not really all that conventional.  I never heard of one 
before Plop.  They are not in any of the books.  (Richard would like that!)

Mark Holm
mdholm@telerama.com

;6 point cell with center point (5 + 1)
var outerradius  0.641072
diameter 250
thickness 25
density 2.45e-06
modulus 6000
poisson 0.22
focal-length 1250
n-mesh-rings 12
rel-support-radii 0 outerradius
num-support 1 5
basis-ring-size 1
basis-ring-min 0
obstruction-diam 50
optimize outerradius 0.01
part bar 1 point 0 0 point 1 0
part bar 1 point 1 1 point 1 2
part bar 1 point 1 3 point 1 4