Help about epanding simulation

Hi, in this simulation I want to achive inflated structure in the image.

But I can’t make edge highlighted yellow similar with my simulation.
image

How can I achieve it? Is there any way to assign stiffness to individual selected edges? I want to make it more resistant to change edge length.

sheetmetal_expand.blend (3.0 MB)

There is a Shape section in the Cloth settings where you can use vertex groups to make parts of the mesh stiffer.
So, not really edges but vertices, as far as I know. But I’m not very experienced with cloth simulation.
I didn’t use stiffness. Instead I modeled the shape a bit different.

And if you convert the cloth simulation to a shape key you can then adjust the shape or combine it with other shape keys to get what you want.

sheetmetal_expand_mod.blend (892.2 KB)

thank you, I believe this will work.