FEA Circular load ("head resting) on top of plate with hole cut out

[loulouv18]

Hi,

I'm trying to simulate the stress distribution that would be placed on top of this "headrest" plate by a person's head. The hole is made smaller than the dimensions of the 95th female head and I created a sketch of the actual 95th dimensions of a female face. I thought by creating a pressure in the area between the face sketch and the hole, it would simulate the pressure that a face would exert onto the head rest. However, it will only let me apply pressure to the whole surface excluding the hole. I am also unsure on where to apply the constraints. The plate will eventually be attached through a frame and hinge system) on the bottom, and only one side will be in contact with another material. 

Would someone be willing to help me with this please?

[johnsonshiue]

Hi! I guess you will need to use a sketch or a surface to split the face. Then you can apply load to the particular face accordingly.

Many thanks!

[loulouv18]

Hi Johnson Shiue, thank you so much for your response! I didn't realize I could split the face so I was able to project the pressure onto that area.

I am still a little unsure on how (and which) constraint to use as it is giving me a warning sign saying that the deformation is much larger than expected. It will be screwed onto a hinging frame on both sides (but not for the entire height) which will then be screwed onto another metal frame. Right now, I am only able to select the edges and circle as constraints - is this also something for which I should use different faces?

Thank you!

Loulou

[JDMather]

Attach *.ipt file here.

My guess is that you are confused about Pressure and Force.

[loulouv18]

Hi JDMather,

Attached is the .ipt file. I have now also tried applying the force instead of the pressure and I believe that applying the "pressure" on the area multiplied it again by the area. In terms of constraints, do you think that I have constrained it correctly? Attached is also a sketch (ignore dimensions) of what it will be attached to (so eventually I'll also have to consider the force from the neck laying on top of it).

Thank you!

Loulou