Elevated Temperature material properties for SA516
Elevated Temperature material properties for SA516
(OP)
Can anyone guide me toward where I can find stress/strain curves for SA516 gr 70 at elevated temperatures? I am working on a non-linear analysis and need these properties. Thanks in advance.





RE: Elevated Temperature material properties for SA516
RE: Elevated Temperature material properties for SA516
RE: Elevated Temperature material properties for SA516
RE: Elevated Temperature material properties for SA516
RE: Elevated Temperature material properties for SA516
One more question on this same subject if you don't mind. I have read in the code that stresses a distance of SQRT(R*t) away from a peak should be considered local primary. If the peak stress are caused by a strap on a vessel, what distance should be used? Would R be half the width of the strap or would R be the radius of the vessel?
RE: Elevated Temperature material properties for SA516
Note that if you are trying to determine if stresses will relax (creep), then you are doing a non-linear analysis. DO NOT linearize any results from a non-linear analysis...
RE: Elevated Temperature material properties for SA516
It is possible that one could have a surface stress that exceeds the linearized membrane-plus-bending stress, and that stress would be considered "peak"
Are the surface stresses (peaks) governed by 1.5S or 3S?
Is there a distance similar to sqrt(r*t) that defines a hotspot stress? For instance if the stress extends a certain distance it should be considered a local primary, or is this engineering judgement?
I really appreciate everyone's help on this. I believe I am getting close to understanding Part 5, but there are a few issues like this one I need to work out.
RE: Elevated Temperature material properties for SA516
No. A membrane stress may be classified as local if the extent to which it exceeds 1.1S in the meridional direction is greater than 1.0*sqrt(r*t).
No - they are governed by the fatigue rules.
No. Your membrane stresses will either be classified as general primary membrane (Pm), local primary membrane (Pl), or secondary. The through-thickness bending stresses will either be primary bending (Pb) if it is in a flat head, or secondary. Anything that exceeds the linear through-thickness stress distribution is peak.
Does this help?
RE: Elevated Temperature material properties for SA516
RE: Elevated Temperature material properties for SA516
As far as how far away from discontinuities you should evaluate the stresses, I would suggest that you take the same approach that you would if you had 3D-solid elements: at the edge of the juncture ring. For a typical nozzle-type arrangement, that is usually 1/2t (to account for the thickness not being explicitly accounted for in the shell/plate elements) + fillet weld leg.
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The good thing about plate/shell elements is that you can directly plot membrane stresses. Do that, with a contour of 1.1S. Then, you can directly measure the meridional extent to which the membrane stress exceeds 1.1S. If that extent is less than 1.0*sqrt(r*t), then the membrane stresses inside that region can be considered local and subject to the 1.5S limit. If the extent is larger that 1.1S, then the membrane stresses are not local and will fail the 1.0*S check.
RE: Elevated Temperature material properties for SA516
RE: Elevated Temperature material properties for SA516
The 1.5S check is for MEMBRANE (i.e. mid-surface) stresses. The 3S check is for MEMBRANE+BENDING (i.e. surface) stresses. Peak stresses (the ones that are handled in Article 5.5) are those surface that are beyond the M+B stresses.
The M+B stresses should be evaluated at the same locations that I indicated in my previous post.
And don't get to confused about primary vs. secondary. First you have to figure out whether it is membrane or M+B. That seems to be the problem to start...
RE: Elevated Temperature material properties for SA516
RE: Elevated Temperature material properties for SA516
You won't find "peak" membrane stresses. Don't bother looking.
In fact, you won't find "peak" stresses (generally) in a shell-plate element analysis. The formulation of the shell-plate element is such that it ASSUMES a linear through-thickness gradient in stress - the exact definition of M+B. If you want actual "peak" stresses that you will evaluate in a fatigue analysis, you will either have to factor your M+B stresses by an SIF, or perform a 3D-Solid FEA.
RE: Elevated Temperature material properties for SA516
RE: Elevated Temperature material properties for SA516
Nice job with staying on this and the detailed explanation.
RE: Elevated Temperature material properties for SA516
metengr - you're welcome.
RE: Elevated Temperature material properties for SA516
RE: Elevated Temperature material properties for SA516
LM
RE: Elevated Temperature material properties for SA516