questions about the results of the probe values

[Iron_Lyon]

Hello, I want to know the principal stress each nodal, and i get the result like this:

When I change the position to Integration Pt, the result is 9.70905 (Unit is Mpa). I understand, each element is under the force of other eight cubic-elements, so the ''Integration Pt'' is just like the ''average''. And when switch to ''Element Nodal'', we can get the values from other 8 cubics (our selected element is in the mittel).

So I focus on which these other 8 elements are? For example, in the picture we select Element Nodal ''1'', we can get the 8 values, are these all in the same layer? When yes, there are only the value of number-Element-Nodal 1,2,3,4 is the same, namely9.70905. But here we get 5 values as 9.70905. I find it's strange and not understand.

Thanks for your reply!

 

[Mustaine3]

C3D8R elements have one integration point, where the stress and strain tensor is calculated. The mises stress invariant is calculated out of that stress tensor. So when you switch to Position=Integration Point, then you see the actual result.
Element Nodal just extrapolates the result from the IP to the 8 nodes of that element. It also averages the value with the extrapolated values of neighboring elements (at each node), as long as the 75% criteria is not reached.
It is similar when you switch to Probe=Nodes.