I'd like to set a uniform load on a model with some separate
faces (read: a load on faces with a gap between, so I'm not able to
knit them)
I attached a part to clear things out.
When I set a force on separate faces, the resultant will be the force x number of faces. so when I apply a force of 100N and select 3 faces....the resultant will be 300N
one option is to measure the projected area of the faces and calculate a pressure normal to a reference plane. Apart from this method to be very time consuming, I cannot find a simple way to measure the projected area.
There must be an easier way to do this..... anyone?
I attached a part to clear things out.
When I set a force on separate faces, the resultant will be the force x number of faces. so when I apply a force of 100N and select 3 faces....the resultant will be 300N
one option is to measure the projected area of the faces and calculate a pressure normal to a reference plane. Apart from this method to be very time consuming, I cannot find a simple way to measure the projected area.
There must be an easier way to do this..... anyone?
http://youtube.com/watch?v=e0UbjSDDvE4
Thanks for your reply!
I couldn't read the values in the youtube avi, but I think I get what you mean.
- You set a force on the faces and run the study
- Measure the resultant force
- Measure the factor that it's off
- Adjust the load
- Run again
This has some disadvantages:
- Only possible with 1 load case or a model that is easy to find out the reaction force
- the forces will not be equally divided along the surface (just scale up your result and you will see a big dent with the small surface)
- A study can take a looooong time to render, so it would be wasting time.
PLEASE fill out enhancement requests for these if you'd like to see them implemented! While we know about the need and they recur on the list of enhancements, the more requests we get, the higher a priority they get.
Thanks!
Vince
Disadvantage 2 ... I agree with Vince...use pressure and iterate to converge the setting for the pressure. But this leads to Disadvantage 3.
Disadvantage 3...I had it solve in about 10 or 15 seconds each time. Your mileage may vary. I did it on my vintage 2004 cpu with 1GB RAM and 2.8Ghz. That has to be modest by most forum readers' standards. If scaling this up to a large number of nodes redlines the solver time, iterate with draft elements. Draft usually produces a wrong resultant but can be calibrated to high quality elements resultant on a smaller model.
Thanks,
G
About the method Vince uses, It is kind of the way I use now.
- make a sketch on the reference plane.
- Create an outline around all faces
- calculate projected area (sadly there is no easier way to measure a projected area)
- Divide the force by the area to calculate the pressure
- apply the calculated pressure
But still I hoped I was missing the easy way.
So an enhancement request it will be, tnx for your help!