Applying load in abaqus 2

[Jlog50]

Hello all,

I would like some input from more experienced analysts please. I am looking to apply a pressure to a surface which is not normal to the surface. Why? Because the surface is at 45deg angle to the x axis but the pressure loading is not. Is there anyway I can angle the pressure load at an angle relative the surface i.e. just like defining x and y directions of concentrated load. I have tried with surface traction with not much success and also I don't feel that surface traction is suitable for my problem.

Many Thanks

 

[rstupplebeen]

Apply a force to the face instead accounting for the surface area. I hope this helps.

Rob Stupplebeen

 

[Jlog50]

You mean by applying a body force?

 

[Jlog50]

I can not seem to apply a force to just the face?

 

[rstupplebeen]

Create a reference point.
Add a coupling constraint between the point and the face.
Apply the force to the reference point.
I hope this helps.

Rob Stupplebeen

 

[corus]

A coupling constraint may force all the nodes to be restrained to move together which may not be what you want. If the pressure load doesn't act normal to the face then calculate the equivalent components that act in the shear (ie. as a surface traction) and normal directions and apply those.

Tata

 

[Jlog50]

Thanks so much for your input everyone

Corus, do you mean resolve the pressure in the x and y directions. However, when I actually apply this in abaqus I will still be applying the pressure normal to the surface?

Would I need to solve this problem by applying a load using a user subroutine DLOAD?

 

[corus]

Surface traction acts prallel to the surface, pressure acts normal to the surface. By resolving those loads you can apply an equivalent 'pressure' that acts in any direction, and not necessarily normal to the surface.

Tata

 

[xerf]

I suspect you can use *DSLOAD with a an ORIENTATION to define the components of a traction vector load.
Some points:
- pressure acts always normal to the surface
- if you have a traction acting at an angle it can be decomposed in a normal component and a shear component.