- #1
uradnky
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Homework Statement
The strain hardening behavior of an annealed, low‐carbon steel is σ = 100,000ε0.2
If a bar of this material is initially cold worked 20%, followed by additional cold work of 30%, determine the probable yield strength of the final bar.
Homework Equations
σ=κεη
At ultimate strength η=ε (Dont think this is applicable here though?)
The Attempt at a Solution
σ=100000(0.5)0.2 = 87055 psi
Im not sure what to do with the percentages of cold work given. Can I use it as strain to find the yield strength at 50% cold work? Does the value of η need to be used as % cold work, or does σ = 100,000 ε0.2 represent a funtion of the yield strength?
Another attempt
I don't think that the % cold work is additive, so am I wrong to assume 50% cold work has taken place?
If 30% CW is with respect to the original 20%, then
A1/A0 = 0.2
A2/A1 = 0.3
A2/A0 = 0.26
so would σ=100000(.26)0.2 be correct?