LOADING CONDITION PRESSURE OR FORCE

[kingcool]

Hi everyone,
I am a bit confused with the loading condition to apply in my analysis and hoping for some reasoning from you all to choose the correct conditions to my application

In the attached photo, the part in black is my product of interest to be analysed. At one of its ends (in the right) a hydraulic piston shown in green applies a load of 200N. The part in black is clamped with another metal piece shown in red. currently I am using ansys for my analysis and i created a remote point (blue) for the surface in yellow and considered the surface to be rigid and associated a remote force of 200N to this remote point. SO is my loading condition correct. Or should I divide this load by the surface area of yellow and apply it on the complete surface yellow?

Also according to the documentation of ansys, the force direction do not change when the part deformation, so is it true even if i apply a remote force on remote point associated to a rigid surface? ....

 

[missil3]

Pressure is better as it distributes the load on several nodes/elements, with point loads you might get a large unrealistic stress concentration around the area of the point load.

 

[rb1957]

you're not really using a point load ... you're disributing the point load onto the structure using rigid beams. I think this loading would preserve the direction of load as the face rotates. mind you, you only see this rotation effect if you're running NL FEA (with geometry non-linear).

you can always check the results ... how do the resultant reactions compare to the applied load ? do they react a load in Y, or a load slightly rotated ??

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