Deriving an equivalent system of forces and moments

[bugatti79]

Folks,

Consider a 2d disk with 2 forces ( ie a bolt pattern) acting axially ie into the page. One can easily get the equivalent force and its point of application to represent the given force system.

One can do the same with an annulus, get an equivalent force and its point of application etc.

However, I have a calculation where the resultant point of application is at a radius smaller than than the inside radius of annulus.

This is no good to me because I need to apply the load physically on the FEA model.

So it appears it is not possible to do this since the calculations are independent of the geometry...

Opinions?

 

[Achy47]

I understand your frustration with trying to accurately represent a force system on a complex geometry. However, I believe that it is possible to find a solution to your problem.

Firstly, it is important to understand that the equivalent force and its point of application are calculated based on the assumption that the geometry is a simple 2d disk or annulus. This means that the results may not be accurate for a more complex geometry.

To accurately represent the force system on your FEA model, you may need to consider the specific geometry and how the forces are distributed throughout it. This could involve breaking down the complex geometry into smaller, simpler shapes and analyzing the forces on each individual shape. From there, you can determine the equivalent force and its point of application for each shape and then combine them to represent the overall force system on the entire geometry.

Another approach could be to use finite element analysis software that allows for more complex geometry and can accurately represent the forces on it. This would eliminate the need for simplifying the geometry and potentially provide more accurate results.

In conclusion, while it may not be possible to directly apply the calculated equivalent force and its point of application on a complex geometry, there are methods and tools available that can help you accurately represent the force system on your FEA model. It may require some additional effort and analysis, but it is certainly possible to find a solution. I hope this helps and good luck with your calculations.