Rigid-body only FEM
Rigid-body only FEM
(OP)
Hi everyone,
I am currently trying to program a MATLAB FEA code that would only take into account large rigid body deformations (no strains, no stress, I might implement this later) for bar linkages (will also head toward beams and more complicated elements later) and the trouble I have is finding the adapted theory for this.
All the FEM documentation I read only mentions rigid-body modes as something you want to avoid (unconstrained model etc.). I found some scientific papers treating this subject but the method they suggest does not seem standard to me ?
-Does anyone have any experience in this kind of problems or have any suggestion for a good book/website about this topic ? I hope this post is not too vague, feel free to ask for more details if needed
Thanks to all of you in advance for your help,
I am currently trying to program a MATLAB FEA code that would only take into account large rigid body deformations (no strains, no stress, I might implement this later) for bar linkages (will also head toward beams and more complicated elements later) and the trouble I have is finding the adapted theory for this.
All the FEM documentation I read only mentions rigid-body modes as something you want to avoid (unconstrained model etc.). I found some scientific papers treating this subject but the method they suggest does not seem standard to me ?
-Does anyone have any experience in this kind of problems or have any suggestion for a good book/website about this topic ? I hope this post is not too vague, feel free to ask for more details if needed
Thanks to all of you in advance for your help,





RE: Rigid-body only FEM
It sounds like you are trying to code a multi body dynamics simulation, it's not really FEM tho.
Cheers
Greg Locock
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RE: Rigid-body only FEM
"rigid body motion" refers to constraining a FEM in space so the FEA doesn't spin out of control.
Whilst your idea is "rigid body", in that your mechanical system components are not straining; really you're looking for mechanical system simulation (like "adams").
another day in paradise, or is paradise one day closer ?
RE: Rigid-body only FEM
If you simply want to simulate the movement of links in a system, then it looks like rb1957 hit the nail on the spot.
May multi body dynamics simulation is the right phrase?
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Stressing Stresslessly!
RE: Rigid-body only FEM
RE: Rigid-body only FEM
http://www.stressebook.com/rigid-body-mode/
www.stressebook.com
Stressing Stresslessly!