Moment load in generative design

admaiora — Wed, 13 Dec 2023 11:08:30 GMT

Hi,

I have just a doubt.

If I apply in the GD enviroment a moment load in case like in the video i see the verse are opposite for the 2 faces (this doesn't happen in the simulation enviroment).

Is it only a gliph problem and I can trust the load applied (I want the load in the same verse)?

What do you think?

Re: Moment load in generative design

Ben-Weiss — Wed, 13 Dec 2023 19:39:48 GMT

Hi @admaiora ,

Thanks for reaching out! Just to make sure I understand, you would expect the two moment glyphs to point in the same direction (clockwise or counter-clockwise) when they are both selected in the structural loads in generative design. Correct?

Assuming I understood you correctly, I played with it on my machine. Depending on how I construct the model I can get the moment arrows to point in the same or opposite directions, so I can recreate the behavior you're concerned about:

On my model I see the same behavior in the Simulation workspace.

Fusion has to make a somewhat arbitrary choice which direction the moment is applied when you pick a cylindrical face. I could write a "guesser" into the selection that tries to get nearly-co-cylindrical faces to apply the moment with the same default direction, but I think it would probably backfire and break in some other situation... I will think about this more and bring it up with the team as a possible improvement.

Until we come up with a fix, my advice is to use two separate loads to create the moment so that you can independently control their direction using the Flip Direction toggle.

I'll admit it's a bit of a pain if you have a lot of split holes like this.

Another option would be to simplify the preserves to be simple holes (using the Edit Model workspace) for the purposes of the generative run. Usually GD can't do much about stress in regions on the surface of your preserves, and that kind of simplification is unlikely to change your generative design output (it might even improve it if you're eliminating a stress riser). Then you can apply a single moment to the entire hole without needing to select multiple entities.

Hope that helps, and thanks again for catching this unexpected behavior!

Ben

Re: Moment load in generative design

admaiora — Wed, 13 Dec 2023 21:51:21 GMT

Thank you @Ben-Weiss !

Re: Moment load in generative design

admaiora — Thu, 14 Dec 2023 09:47:35 GMT

Hi ben,

separating the loads (apply moment to each face) ..are you sure that I will obtain the same deformation?

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Moment load in generative design

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Re: Moment load in generative design

Re: Moment load in generative design