EAengineering07
Mechanical
- Dec 1, 2022
- 6
Hello All,
I have been working on modeling a Dust Collector we are doing some modifications to. When modeling the Channel Stiffeners (C4's), I used rigid links created per RISA Specs, to attach the C4 stiffeners at their centerline with offset to the nodes between plates, they are running the height of the DC's plate walls, which I think essentially simulates it being stitch welded on. When Viewing the results, some of the stiffeners fail by a considerable amount for bending and axial interaction code check(above 2 in some cases). I decided to begin releasing the ends of the rigid links, which got the stiffeners to pass.
This caused me to have a few questions. Mainly, is this the correct way to go about modeling this situation? Which end of the rigid link should be released? Should both ends be released? If I release all rigid links for a stiffener, then the model fails P-Delta which makes some sense to me.
My thinking is, that the stitch welding wouldn't be considered a fully fixed connection. Therefor, the rigid links should be released. But when I think about what would happen physically if the stiffener would begin to bend, how would the stiffener not transfer moment into the DC'S plate walls? If the stiffener begins to bend, the plate will begin to bend with it.
I can provide some screenshots if needed. Thanks in advance for any and all help!
I have been working on modeling a Dust Collector we are doing some modifications to. When modeling the Channel Stiffeners (C4's), I used rigid links created per RISA Specs, to attach the C4 stiffeners at their centerline with offset to the nodes between plates, they are running the height of the DC's plate walls, which I think essentially simulates it being stitch welded on. When Viewing the results, some of the stiffeners fail by a considerable amount for bending and axial interaction code check(above 2 in some cases). I decided to begin releasing the ends of the rigid links, which got the stiffeners to pass.
This caused me to have a few questions. Mainly, is this the correct way to go about modeling this situation? Which end of the rigid link should be released? Should both ends be released? If I release all rigid links for a stiffener, then the model fails P-Delta which makes some sense to me.
My thinking is, that the stitch welding wouldn't be considered a fully fixed connection. Therefor, the rigid links should be released. But when I think about what would happen physically if the stiffener would begin to bend, how would the stiffener not transfer moment into the DC'S plate walls? If the stiffener begins to bend, the plate will begin to bend with it.
I can provide some screenshots if needed. Thanks in advance for any and all help!
