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strain hardening coefficient?

strain hardening coefficient?

strain hardening coefficient?

(OP)
A year or so ago, I remember I saw one practical way to interpret or get strain hardening coefficient. It is like dividing tensile strength by yield strength, then minus 1, you will get the cofficient. I am give you example here to tell you what I am asking. It is something like this, but I can't remember.

Does this ring any bell to anyone? Thanks a lot. How Christmas eve dinner treat everyone? I have been super sick, didn't have anything.  

RE: strain hardening coefficient?

(OP)
That was informative, at one point, I thought it is exactly what I want, then it is not. Thanks a lot Arun.

RE: strain hardening coefficient?

Perhaps you are thinking of Considere's criterion.

F=σA
dF=dσA+σdA

At maximum load (ultimate strength σu) dF=0 so

dσA=-σdA or dσ/σ=-dA/A

For constant volume process

V=AL; dV=AdL+LdA=0
-dA/A=dL/L=dε

So dσ/σ=dε at ultimate load or

dσ/dε=σ

If σ=Kεn
dσ/dε=Knεn-1

n=Knεn-1 -> n=ε

So the strain hardening exponent is equal to the true strain at ultimate load.

RE: strain hardening coefficient?

(OP)
Thanks a lot TERIO, well done. Very possible, but I thought it is something else. Right now I still need one more equation or relationship to close the loop. :(

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