Solid Finite Element vs Through-thickness stress close to yield point
Solid Finite Element vs Through-thickness stress close to yield point
(OP)
Hi gents!
I would like to ask you about your engineering opinion on following FEA case.
Given is thick plate (40mm thickness) with dimensions in plan of 500x500mm. It is modelled by solid finite elements with edge of 10mm each.
At some small area of this plate, in effect of loading conditions, there is cubic area 40x40x40mm for which mean von Mises stress is equal to yield strength of the ductile steel material plate is made from. Other areas are well below yield strength.
Note, it is through-thickness phenomenon.
Question is, how would you interpret the results and why, will the plate take it or not?
I would like to ask you about your engineering opinion on following FEA case.
Given is thick plate (40mm thickness) with dimensions in plan of 500x500mm. It is modelled by solid finite elements with edge of 10mm each.
At some small area of this plate, in effect of loading conditions, there is cubic area 40x40x40mm for which mean von Mises stress is equal to yield strength of the ductile steel material plate is made from. Other areas are well below yield strength.
Note, it is through-thickness phenomenon.
Question is, how would you interpret the results and why, will the plate take it or not?





RE: Solid Finite Element vs Through-thickness stress close to yield point
another day in paradise, or is paradise one day closer ?
RE: Solid Finite Element vs Through-thickness stress close to yield point
RE: Solid Finite Element vs Through-thickness stress close to yield point
another day in paradise, or is paradise one day closer ?
RE: Solid Finite Element vs Through-thickness stress close to yield point
Secondly, if you are above YS, the elastic model is still useful in that you can alter the design and compare the resulting stresses without having to go full nonlinear. Besides, if you are using common plate, the nonlinear characteristics of this material is quite complex making the analysis perhaps even less useful. I would work to reduce the stress by changing geometry if possible to get it below the YS point.
RE: Solid Finite Element vs Through-thickness stress close to yield point
RE: Solid Finite Element vs Through-thickness stress close to yield point
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RE: Solid Finite Element vs Through-thickness stress close to yield point
This is one check I can think of. Please see the variation of Von Mises stresses from loading point to some short distance. If the variation is huge, then the anomaly could be due to loading effect i.e. if the distance to which stresses are below yield is really short.
"At some small area of this plate, in effect of loading conditions, there is cubic area 40x40x40mm for which mean von Mises stress is equal to yield strength of the ductile steel material plate is made from."
"Note, it is through-thickness phenomenon."
You are quoting both Von Mises as well as Through-thickness. It is possible that major component in Von Mises is coming from Through Thickness (is the through thickness stress normal or shear components?)