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Plane strain study with prescribed displacement

Posted 19.06.2012, 06:57 GMT-4 Modeling Tools & Definitions, Parameters, Variables, & Functions, Studies & Solvers, Structural Mechanics Version 4.2 2 Replies

Elliott Breittmayer
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I tried to solve a basic problem with prescribed displacement on each boundries (u1=y et u2=x), and i don't get the good result. I don't get after solving the displacement i put. I tried several ways to write the prescribed displacement and nothing seems to work. I attach my file to this message.
I'm sorry i can't be more explicit but i'don't understand where the problem come from.
Thank you for your help.
2 Replies Last Post 22.06.2012, 10:36 GMT-4
Elliott Breittmayer
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Posted: 1 decade ago 19.06.2012, 06:58 GMT-4
Here is the file
Here is the file

Attachments:

Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 22.06.2012, 10:36 GMT-4
Hi

I would rather ask what are you trying to do, and aren't you confusing space coordinates x,y,z and displacement u,v,w ?

Anyhow if you squeeze a 5m side cube by 2.5 m in all direction you end up with a point, that is a severe topology change than no programme, norm any simple math can handle, at least not like this

The prescribed displacement is differential distance so use rather 0.1% of the side length (strain) to stay within a reasonable elastic limit. then check only one direction (normal to the boundary) and leave the other unchecked (free to change, else you are getting a strange skewed thing

--
Good luck
Ivar
Hi I would rather ask what are you trying to do, and aren't you confusing space coordinates x,y,z and displacement u,v,w ? Anyhow if you squeeze a 5m side cube by 2.5 m in all direction you end up with a point, that is a severe topology change than no programme, norm any simple math can handle, at least not like this The prescribed displacement is differential distance so use rather 0.1% of the side length (strain) to stay within a reasonable elastic limit. then check only one direction (normal to the boundary) and leave the other unchecked (free to change, else you are getting a strange skewed thing -- Good luck Ivar

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