Max principal stresses
Max principal stresses
(OP)
Hei,
I have two queries. I want to get max value of maximum principal stress at each time point. I want to know that what does this mean? Are these max principal stresses in each node of element and single value is their averages at centroid?

Secondly, I want to get a max value of max principal stress by averaging max principal stress value around this element (from surrounding 4 elements).
I have two queries. I want to get max value of maximum principal stress at each time point. I want to know that what does this mean? Are these max principal stresses in each node of element and single value is their averages at centroid?

Secondly, I want to get a max value of max principal stress by averaging max principal stress value around this element (from surrounding 4 elements).
RE: Max principal stresses
RE: Max principal stresses
RE: Max principal stresses
- "Understanding how results are computed"
- "Understanding result value averaging"
- "Understanding probing"
They explain in detail how Abaqus postprocesses the results before displaying them and how probing tool actually works. For example it is explained that for elemental output Abaqus obtains probe results on an element-by-element basis without averaging.
RE: Max principal stresses
the data can be element centroid data or it can be nodal (corners, averaged for the different elements).
then you can plot this data as either elemental (centroidal) or nodal (corners) and the s/ware interpolates.
another day in paradise, or is paradise one day closer ?
RE: Max principal stresses
Anyways, I've never heard of the advice to "average the centroidal stresses of the neighboring elements" because "you can't trust results from a single element". The truth is, for a well-defined FEM-problem you absolutely can trust the results from a single element as you can show that the best-approximation property holds for derived values. The caveat to this is contained within well-defined as stress-singularities, elements at a boundary-condition, locking, etc. can have issues to be sure. What I typically advise is to look at a quilt plot of stresses and if you see a region that has either oscillatory stresses or a stress that qualitatively looks out-of-place compared to its neighbors, to then explore further to see whether you have a singularity, locking, or haven't yet converged to accurate stress results.