How to bend tube to evaluate stress?
How to bend tube to evaluate stress?
(OP)
Am a newbie to Cosmos and want to perform a 90 degree bend on a straight extrusion to evaluate the stress or distortion at the inner radius (if any).
Besides fixing one end of the extrusion, I am not sure which other restraint to apply to perform a 90 degree bend?
Please advise.
Besides fixing one end of the extrusion, I am not sure which other restraint to apply to perform a 90 degree bend?
Please advise.






RE: How to bend tube to evaluate stress?
corus
RE: How to bend tube to evaluate stress?
RE: How to bend tube to evaluate stress?
I suspect that you will definitely need to perform this as a large-displacement (non-linear) analysis, so you will have to have the large displacement flag on.
I'm not all that conversant with COSMOS (we only have the linear-static bundle here and use ABAQUS for everything else
Martin
RE: How to bend tube to evaluate stress?
RE: How to bend tube to evaluate stress?
corus
RE: How to bend tube to evaluate stress?
The material's yield and plastic deformation stress/strain behaviour are key to analyzing this problem.
Also, the final inner distortion of the tube will depend on how you model the bending dies and what assumptions are made for clamping and friction. Also, springback may be significant as well.
ERT
http://www.akeng.com
RE: How to bend tube to evaluate stress?
I would add the following:
1. For such a large displacement, your model is probably experiencing element locking (deformed elements exceed geometry limits).
2. Even better than an analysis for this problem would be to talk to a fabricator (tube bender). They will be able accurately predict the distortion that you will see. Depending on the radius of the bend, they may take counter measures like filling the tube with sand. We use a couple of good tube benders, let me know if you would like contact information.
RE: How to bend tube to evaluate stress?
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