Difference between revisions of "Contrib:KeesWouters/bc/rbe3"

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m (Geometry and mesh of the block with cylindrical hole)
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=='''Geometry and mesh of the block with cylindrical hole'''==
 
=='''Geometry and mesh of the block with cylindrical hole'''==
This construction shows the use of ''LIAISON_DDL'' to simulate boundary condition on a cylindrical hole. It just shows the use of it.
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This construction shows the '''RBE3''' constraint. This is used to apply a moment to the top surface of a cylinder. The bottom surface of the cylinder is fixed 3dof to the world. The inner and outer diameters of the cylinder are 15 and 17 (arbitrairy units) and length 75. The used material is steel, material properties are in ISO units (this makes the dimensions of the cylinder ISO as well).
  
The boundary conditions ore build around a cylindrical hole in a block. The nodes attached to the cylinder are restricted to rotate around its central axis. The definition of this axis is done by two points P1 and P2 that need to be provided.  
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The geometrical entities on the cylinder are, A for surface areas:
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* Atop and
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* Abot
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Abot is used to apply the torsion moment, Atop is used to apply the fixed boundary condition to the 'world'.
  
The geometry consists of a block with a cylindrical hole near the bottom side. The overall dimensions of the block are [Lx * Ly * Lz] = [2.0 * 3.5 * 20.0 ]. The hole is placed on the x-plane at position [yc, zc] = [2.0, 3.0]. The radius of the hole is R=0.45.
 
  
 
Some images of the construction:<br/>
 
Some images of the construction:<br/>
 
: [[image:kw_cylinder_rbe3_geom.png]] * [[image:kw_cylinder_rbe3_nodes.png]]
 
: [[image:kw_cylinder_rbe3_geom.png]] * [[image:kw_cylinder_rbe3_nodes.png]]
 
: [[image:kw_cylinder_rbe3_nodes2.png]]
 
: [[image:kw_cylinder_rbe3_nodes2.png]]
 
 
A number of groups has been defined (P for plane, L for line segments):
 
* Ptop (not used)
 
* Pbot (not used)
 
* Pcyl (could be used to define nodes on this surface)
 
* Lcyl (not used in final version) and
 
* Ltop, used to apply boundary conditions in x and y direction.
 

Revision as of 21:23, 18 February 2013

Geometry and mesh of the block with cylindrical hole

This construction shows the RBE3 constraint. This is used to apply a moment to the top surface of a cylinder. The bottom surface of the cylinder is fixed 3dof to the world. The inner and outer diameters of the cylinder are 15 and 17 (arbitrairy units) and length 75. The used material is steel, material properties are in ISO units (this makes the dimensions of the cylinder ISO as well).

The geometrical entities on the cylinder are, A for surface areas:

  • Atop and
  • Abot

Abot is used to apply the torsion moment, Atop is used to apply the fixed boundary condition to the 'world'.


Some images of the construction:

File:Kw cylinder rbe3 geom.png * Kw cylinder rbe3 nodes.png
Kw cylinder rbe3 nodes2.png