Discontinuity in Sigma2

disla

Hi,

I don’t understand well what could be going on with S2 on this model.?¿?
It happens as soon as I enter some Poisson value different from zero.
Is it possible that the orientation has changed once expanded?

Thanks

Victor

On the upper surface, stress YY is the by far the most negative everywhere so that would be S3, while XX and ZZ are both similar in value but neither is consistently the highest. So the directions of the 1st and 2nd principal axes are probably spinning around the Y axis according to small differences or error.

The 1st principal stresses shows similar banding on the upper surface but you have to adjust the range of the color scale to see it.

With Poisson's ratio = 0, XX stress is consistently zero so the principal directions are probably more consistent and closely aligned with the global axes.