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Boundary constrain on simple tension

Posted 19.02.2011, 11:53 GMT-5 Modeling Tools & Definitions, Parameters, Variables, & Functions, Structural Mechanics Version 3.5a 3 Replies

Sandra Perondi
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Hi!

I'm trying to model the simple uniaxial tansion of a neo-hookean hyperelastic beam, and i have some problems about the bounday contrain.
I fixed an extremity and i impodes a ditribuited load at the othe end. The problem is this last end: infact i would like to constrain both ends of the strip, in a such way the loaded end can't deform in any direction.

I tried the roller and the axial simmetry constrain, and the prescribed displacement, but the problem remain.

In attach the fugure of the deformed shape of the beam. What can i do to prevent the deformation of the face in the load direction?

Thanks a lot for your help!

Sandra

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3 Replies Last Post 20.02.2011, 07:52 GMT-5
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 19.02.2011, 15:12 GMT-5
Hi

if you want to impose that the loaded edge remains "straight", then you should look up the example in the 3.5a doc about a rigid edge beam, but I do not remember exactly in which doc it is ;)

--
Good luck
Ivar
Hi if you want to impose that the loaded edge remains "straight", then you should look up the example in the 3.5a doc about a rigid edge beam, but I do not remember exactly in which doc it is ;) -- Good luck Ivar
Sandra Perondi
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Posted: 1 decade ago 20.02.2011, 07:18 GMT-5
Thank you Ivar!
I found the example you suggest in Structural Mechanics Model User's Guide, and also I found this topic in the forum

www.comsol.com/community/forums/general/thread/7961/

But in my case, the domain to be "stright" is not an edge, but a face, and i work whit the Structural mechanics->solid stress-strain module, so i didn't understand how i can apply the edge example.

Sandra


Thank you Ivar! I found the example you suggest in Structural Mechanics Model User's Guide, and also I found this topic in the forum http://www.comsol.com/community/forums/general/thread/7961/ But in my case, the domain to be "stright" is not an edge, but a face, and i work whit the Structural mechanics->solid stress-strain module, so i didn't understand how i can apply the edge example. Sandra
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 20.02.2011, 07:52 GMT-5
Hi

well if you are in true 3D then you boundaries are 2D, indeed you need to adapt the example from the 2D (1D boundaries=edges) to faces

By the way in 4.1 you have the RBC (rigid boundary conditions) that will do it for you

--
Good luck
Ivar
Hi well if you are in true 3D then you boundaries are 2D, indeed you need to adapt the example from the 2D (1D boundaries=edges) to faces By the way in 4.1 you have the RBC (rigid boundary conditions) that will do it for you -- Good luck Ivar

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