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Hollow sections don't simulate?
Richard_Inv
Member Posts: 35 PRO
So I have a simple rectangular frame, attached to two fixed pins.
It simulates fine when the frame is solid, takes about 1 minute
But when I make the frame hollow (about 2mm thick), it just will not simulate. Just spins the loading wheel
Setup pictured below, if anyone has any ideas?
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Comments
From other threads, the issue is likely that Onshape simulation doesn't (yet) have a shell element.
https://forum.onshape.com/discussion/comment/119867/#Comment_119867
Simon Gatrall | Staff Mechanical Engineer | Carbon, Inc.
This seams to work OK. Maybe the extra fixed locations are giving trouble.
https://cad.onshape.com/documents/7cd9097db9a39677f054b262/w/956877d55e01351d69173503/e/990d30f4c89a064240efd9b5
@glen_dewsbury How thin is the tubing wall? From what I understand it's an aspect ratio issue which can trigger the simulation status to never resolve.
Simon Gatrall | Staff Mechanical Engineer | Carbon, Inc.
S1mon. How far does the aspect ratio need to change before this won't work?
The original frame was 0.375 x 0.375 x 0.0625.
Increased to 1.25 x 2.5 x 0.125 and still works.
@glen_dewsbury I really don't know. I tried to simulate a load on a sheet metal shelf part and was told by @GregBrown it wouldn't work because there wasn't a shell element in simulation.
Simon Gatrall | Staff Mechanical Engineer | Carbon, Inc.
!! No sheet metal??
It sort of works but it makes 3D meshes of thin parts so it's very inefficient. The thinner the part relative to the overall size the worst it gets…
I've had reasonable success with parts up to 30x20 made out of 0.1" thick material but even that runs very slowly…
Tried this with a sheet metal. It worked notably faster as 0.5 thick compared to 0.06 thick.
https://cad.onshape.com/documents/7cd9097db9a39677f054b262/w/956877d55e01351d69173503/e/aec6f04eb8be80881c9fed77