tensile strength (MPa) 800 600 yield strength (MPa) ductility (%EL) 60 40 350 Cu
ID: 1713713 • Letter: T
Question
tensile strength (MPa) 800 600 yield strength (MPa) ductility (%EL) 60 40 350 Cu 200 Cu 400 20 so Cu 0 20 40 60 0 20 40 60 20 40 60 %Cold Work % Cold Work % Cold Work Ultimately, you decide to work with the original sample and use cold work to increase its yield strength. Describe a specific procedure for ho the desired yield strength. Include calculations, as appropriate. (6 pts) c) Explain in a sentence or two HOW and WHY cold work would affect the yield strength. (4 pts) + O d) What will the resulting ductility be? (2 pts) 30% Is this ductility MORE 6r LESS than the original ductility? (Circle one) Explain WHY ductility was affected in the manner you indicated in e). (4 pts) e)Explanation / Answer
c) A specfic method of increasing the yield strength of material through cold work is work hardening. Work hardening, also known as strain hardening is the strengthening of a metal by plastic deformation. This strengthening occurs because of dislocation movements and dislocation generation within the crystal structure of the material.
As the material is taken higher than the yield stress, when it come back to unloaded stress, there is a permanent strain in the material that is left behind. Now when the material is loaded, it goes to a higher yield stress as there is already a permanent strain in the material.
d) Dultilty would decrease to 15% EL
e) Ductility would be less. As yield stress and ductlity have an inverse relationship, as yield stress increase, ductility decrease.
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