pic: 4587-Sheet Metal Chassis V.2

[AdamHeard]

Originally Posted by Greg Woelki

I was under the impression that the smaller the radius, the higher the stress concentrations, like so: https://drive.google.com/file/d/0B4u...it?usp=sharing

I'll try doing the same thing with triangular cut outs though. Perhaps it also depends on how it is loaded.

Ah, yes. You make a good point but that isn't an argument against triangular pocketing, but rather an argument against too small of a radius.

Ideally triangular pocketing has webs sticking out in most directions of loading, so stress flows nicely and never has to take corners anyway. Isogrid is a really cool optimized pattern everyone should look up.

[Greg Woelki]

Originally Posted by AdamHeard

Ah, yes. You make a good point but that isn't an argument against triangular pocketing, but rather an argument against too small of a radius.

Ideally triangular pocketing has webs sticking out in most directions of loading, so stress flows nicely and never has to take corners anyway. Isogrid is a really cool optimized pattern everyone should look up.

Now that I think about it, lightening with triangles like you said so that it leaves a truss-like pattern should be stronger.

[Cash4587]

Originally Posted by AdamHeard

Ah, yes. You make a good point but that isn't an argument against triangular pocketing, but rather an argument against too small of a radius.

Ideally triangular pocketing has webs sticking out in most directions of loading, so stress flows nicely and never has to take corners anyway. Isogrid is a really cool optimized pattern everyone should look up.

Do you mean "118 Grid"?

[Greg Woelki]

Am I approaching this incorrectly? Each side is the same length, is under the same load, and is the same weight. I started the triangles with 0.1" round radius and I worked up to 0.25" (in picture), adjusting their dimensions to keep the volumes the same as I went. There is still higher stress in the piece lightened with triangles and if I increase the radius of the round much more then they might as well be circles.

https://drive.google.com/file/d/0B4u...it?usp=sharing