How to apply a B.Cs that move the object in 45 degree? or certain angle?

[liq001]

Hello all,

I am a basic question for applying a displacement B.C. in ABAQUS. Do you guys have any idea about how to apply a displacement B.Cs on a reference node that allow the object to move in 45 degree or certain angle? for example, when I do peeling test, can I can pull the peel edge in a certain angle like 45 degree? Thanks for any help

Best
lee

 

[FEA way]

You can prescribe an angular displacement (in radians) to rotational degrees of freedom (UR1 - UR3) if they are available (and ref nodes have them).

 

[liq001]

Thank for you input @FEA way. The problem is I need to ref nodes to move in certain displacement at a fixed angle, not only to rotate it. Think about a peel test, I would like to grab one edge of the peel arm and peel it at 45 degree direction in 30 mm? Thanks again for your help.

Regards
lee

 

[FEA way]

Can't you place the ref node at a distance so that rotating it will move the nodes on the other side of the rigid body constraint along an arc ?

 

[liq001]

Sorry not very sure what you explained but thanks for your input and help. I have attached a picture for your reference, the only task I would like to attach is move the peel arm in a distant in certain angle of degree.

 

[FEA way]

I thought that you needed a circular motion but this will be a bit more tricky. If you attach a reference point to the end of the beam, you can apply boundary conditions in two directions (UX and UY) with time variation controlled by tabular amplitudes. Look for some examples of their usage. Peeling/delamination simulations are usually done in simpler ways, by just moving the ends of the beams upwards and downwards in a straight line.

 

[SWComposites]

why do you want to apply a displacement instead of a load? seems way more complicated to apply a displacement.
if you really need to apply a displacement, just displace the end node where the force is applied along a defined path (though its going to be hard to know the correct path ahead of time).

 

[liq001]

@ SWComposites, that because of I am doing peel test, I have no input of the load and I will need to peel one layer of material up to certain distance.