Apply Bearing Load in Patran 1

[eaolsen5]

I need to learn how to apply a bearing load to a hole in Patran. I have the Force value (not pressure) and i need to apply this as a bearing load (sin function) to the hole in a specific radial direction. This is very easy in other software I have used, but I havn't found a good way to do it in Patran. I have geomerty entities as well as the mesh entities in the model so the force could be applied to either (whatever works better).

 

[Onda]

Hi,
You should make a cylindrical coord on the center of the hole. then you should define a vector spatial field with this function

-1* ( sinr ( 'T ) - abs ( sinr ( 'T ) ) ) / 2

defined on the cylindrical coord.

for the direction of load and 0 for the other directions.

apply a force on ALL node around the hole with as vector the field defined. and 1 on the Scale factor

run the utility Loads/BCs LBC Resultant to check for the total amount of load applied.
modify the load with a correct scale factor.
It's tricky but should work!!
Stefano

 

[eaolsen5]

This looks like a good solution. Do you know if the force will be applied only to the front side of the cylinder, ir if it will be applied all the way around?

 

[Onda]

The "ABS" make the function be 0 in the rear part of cylinder and the "SIN" value in the front part.
If you prefer you can simplify it and use a spatial field with the function:
sin('T)
But you should pick only the grids in the front part else you will have a node with a pulling force!.
Onda

 

[eaolsen5]

Do I need to orient the csys in the direcction of the load? Will the load be applied in the Radial or Tangential axis?

Thanks,

Erik

 

[Onda]

You need to orient the cylindrical Csys in the direction of load if you don't wont to add an angular conversion in the field.
You mast apply the load in the radial direction, to do this you should define the VECTOR field only for the radial direction and not for the tangential.
I add an image of Patran with the field creation, maybe could help.

 

[eaolsen5]

Thanks for the help. From your picture, it looks like the load is applied in the negative Tangential (T) direction.

E

 

[Onda]

To apply load on the positive direction just change the field :

-1* ( sinr ( 'T ) + abs ( sinr ( 'T ) ) ) / 2.

BTW remeber to apply the load in the Cylindrical CSys (in my previous picture the coord 1008)
Onda

 

[eaolsen5]

I tried that. It does change the direction of the force but it doesn't change which nodes the force is applied to.

E

 

[eaolsen5]

Nevermind. I got it. Thanks!