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*Engineering*stress increases after reaching the yield stress point, and continues to increase until reaching the UTS. Am I correct when I remember that there is strain hardening that occurs along the region from Yield stress to the Ultimate tensile stress? Engineering stress equals Force divided by Original cross-sectional area: σ=F/Ao

My first thoughts were that obviously as you increase the force, the stress will increase (from a purely mathematical outlook, this is apparent since stress increases proportionally to force). How could this be explained in better engineering terms?

Thanks