Learning Forum

[jvaldes]

I've modeled up a simplified version of one of the parts for a design to validate the Ansys simulation against my hand calculation (Roark's 7th Ed. Table 11.2 Case 10b). The hand calc shows that my max stress will be at the edge of the boundary condition. Ansys does have the max stress in that location, but it diverges because obviously as the mesh is refined, the area of the load is getting smaller and smaller. How do I determine what the actual stress in that location would be?

I'm having this same kind of problem on a lot of my parts: I get singularities at the edges of where the boundary conditions are applied. For some of the parts, I know it's not where the max stress is so I kinda just un-refine the mesh to hide it, but for parts like the one below (which is the model being simplified), I'm not confident the max stress isn't at the edge of the constraint.

Several stress singularities are being hidden behind unrefined mesh here. The one I'm concerned about is the one that would be at the ID of "Compression Only Support A".

[Erik Kostson]

Hi

Hope the below links help:

http://www.acin.net/2015/06/02/stress-singularities-stress-concentrations-and-mesh-convergence/

https://enterfea.com/stress-singularity-an-honest-discussion/

https://www.ansystips.com/2017/05/fea-stress-singularities.html

and many other posts if one searches on the internet

Erik

 

[jvaldes]

Thanks Erik.

Unfortunately I have already considered that kind of stuff and was hoping for some other solutions.