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About Fixed constraint

Posted Jun 11, 2013, 7:41 a.m. EDT Materials, Structural Mechanics Version 4.1, Version 4.2, Version 4.2a, Version 5.0 3 Replies

uday
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Hi,
i have applied fixed constraint (in SM module) at one end of the plate. that is the displacements are zero in all (X,Y,Z)direction. What about rotation? rotation also zero in three direction?

can you explain me
please...
3 Replies Last Post Feb 2, 2017, 5:31 p.m. EST
Henrik Sönnerlind COMSOL Employee

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Posted: 1 decade ago Jun 12, 2013, 4:54 a.m. EDT
Hi,

In a Beam, Shell, or Plate interface, the Fixed condition means that all translations and rotations are zero. In the physics interface having only translational degrees of freedom it means constraining all translations.

Regards,
Henrik
Hi, In a Beam, Shell, or Plate interface, the Fixed condition means that all translations and rotations are zero. In the physics interface having only translational degrees of freedom it means constraining all translations. Regards, Henrik
Jazmin Espinoza
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Posted: 7 years ago Dec 21, 2016, 5:51 p.m. EST
but if the problem is a 3D problem like a solid, the rotations with fixed constraint are also equal to zero? in the case that are not zero, which constraint or condition I have to use for that the rotations are equal zero?

excuse my english
but if the problem is a 3D problem like a solid, the rotations with fixed constraint are also equal to zero? in the case that are not zero, which constraint or condition I have to use for that the rotations are equal zero? excuse my english
Jeff Hiller COMSOL Employee

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Posted: 7 years ago Feb 2, 2017, 5:31 p.m. EST
In a 3D solid analysis, there is no degree of freedom associated with a point's rotations, only its translations. Therefore you cannot directly constrain the rotation of individual points.
Jeff
In a 3D solid analysis, there is no degree of freedom associated with a point's rotations, only its translations. Therefore you cannot directly constrain the rotation of individual points. Jeff

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