How rotate a body in explicit 1

[Me09]

Hi
I have created a simple 3d body in abaqus/explicit v6.7 and try to rotate it using boundary condition (displacement/rotation). I have defined UR1 and want to turn the body over the X direction. After running the program there is no error but I cannot see any change on the body.
Does anyone have any idea for this?

Thanks
Me

 

[vumat721]

There are two problems with that:
* ur3 is a nodal degree of freedom, so this would not rotate the body.
* 3d bodies typically only have displacement degrees of freedom, not rotation degrees of freedom, which is why nothing happens

There are many ways to rotate a body, and it depends on what you want to do. One thing I often do is tie a rigid body to my deformable body, then I apply a rotation (or displacement) to the rigid body reference node. This reference node can have displacements and rotations applied to it.

Or, instead of creating the rigid body, you can use constraints to tie a reference node to all the dof's of your body. And, as before, apply the rotation or displacement to this reference node.

 

[Me09]

The answer was useful. The body is an irregular shape imported to Abaqus as an orphan mesh. I want to rotate it or give angular velocity to it. It is dificult to tie a rigid body to the body with a big number of elements. I have tried to constrain it and tie it to a reference point then rotate it from reference point but was not successful. Indeed I don’t know what kind of constrain is suitable for it. Do you have any idea for this problem?

Thanks
Me

 

[vumat721]

are you just trying to see what happens to the body when you rotate it? are you trying to move the body into contact with another one?

 

[Me09]

the problem is about the simulation of an elbow. I want to rotate one of the bones like a normal elbow. the bones have been linked by ligaments.

 

[vumat721]

perhaps you could apply a body force to the bone? i've never done this, but it seems like a possible solution. use *Dload with one of the load labels "centrif", "corio", or "rota".

 

[Me09]

I have tried the constrain “coupling” then defined a reference point as a control point, seems it is working.

 

[vumat721]

Oh yeah, a kinematic coupling! I should've said that instead of "tie" when I was talking about "you can use constraints to tie a reference node". Good luck!