Material curves based on Material Certifivates
Material curves based on Material Certifivates
(OP)
Can you from a standard material certificate make a rough approximization of a stress-strain curve? The parameters used are: Yield stress, tensile stress, reduction of area at break and elongation at break...
Regards
Tommy
Regards
Tommy





RE: Material curves based on Material Certifivates
I have not failed. I've just found 10,000 ways that won't work." — Thomas Edison
_____________________________________
RE: Material curves based on Material Certifivates
Note that we are not material scientists, but of course we must check such problems more thoroughly in the final design phase. When working with both materials and limited space for our applications we must tune our design throughout the whole project.
RE: Material curves based on Material Certifivates
Coordinate system is strain (abscissa) vs. stress (ordinate).
1) Straight line from 0,0 to YS/E,YS
where
YS is yield strength
E is Young's modulus obtained from a handbook or equivalent
2) Parabola from YS/E,YS to EL,YS
where
EL is elongation at break
The stress at break is just for convenience and symmetry. The maximum of the parabola can be placed at MEAN(YS/E,EL),TS
where
TS is the tensile strength
RE: Material curves based on Material Certifivates
RE: Material curves based on Material Certifivates
Precisely,in the non linear region the flow curve need not be as what we conventionally think. It could depend on many other factors too.
I have not failed. I've just found 10,000 ways that won't work." — Thomas Edison
_____________________________________
RE: Material curves based on Material Certifivates
http://en.wikipedia.org/wiki/Stress_(mechanics)
http://en
RE: Material curves based on Material Certifivates
RE: Material curves based on Material Certifivates
Another factor to consider is material thickness. Predicting highly localized stress concentrations and resulting strains in thick cross sections using the simple variables from the tensile curve can introduce much error, particularly when FEA analysis is a shell, not a solid. Mesh size is also a factor.