(average)nodal stress skewed?

[321GO]

On my assembly the location with the highest stress occurs at the mating between two components. When comparing nodal vs element value's there is a large difference.

Is this normal behavior? To my understanding yes, because of the inherent differences on both "sides" of the mated components, which results in non egual element stresses(on shared nodes).

Do the averaged nodal value's become skewed and is it best to use element stresses in such transition locations?

Thanks in advance...

 

[kellnerp]

I kinda thought it would look something like that. It looks complicated but actually makes machining easier. Because of that you probably want to consider setting your geometry near both bounds of the tolerance band on where the cut stops.

Assuming you used mesh controls in the fillet areas did you figure a certain number of elements around he fillet? With quadratic elements you shouldn't need a whole lot, maybe two or three. But you should make sure that the the elements aren't skewed. Keeping the aspect ratio really low might help that in that area. You want to make sure that the elements expand slowly away from the fillet to keep their shape close to ideal.

A hex mesh would be much easier to control.

TOP
CSWP, BSSE

http://www.engtran.com

http://www.niswug.org

"Node news is good news."

 

[EngAddict]

"A hex mesh would be much easier to control."

Do you think any of the enhancement requests actually go through? At least bricks would be good.

 

[321GO]

Thumbs up to all who contributed!

Let's call this one done.