3. Force and length change date are given in Table. P4.4 for the initial portion

Question

3. Force and length change date are given in Table. P4.4 for the initial portion of a tension test on AISI 4140 steel tempered at 538(Celcius). The diameter before testing was 10mm, and the gage length for the length change measurement was 50mm.

NOTE: In Part (a), use Excel to generate the engineering stress-engineering strain curve.

In addition, compute and plot true stress vs. true strain. Plot on the same graph as

engineering stress vs. engineering strain so that you can clearly see the differences

between the curves. Hand-drawn plots will NOT be accepted.

Force and length change date are given in Table. P4.4 for the initial portion of a tension test on AISI 4140 steel tempered at 538(Celcius). The diameter before testing was 10mm, and the gage length for the length change measurement was 50mm. Caculate corresponding values of engineering stress and strain and display these values on a stress-strain plot. (Your graph should agree with Fig. P4.5.) Determine the yield strength for a plastic strain offset of 0.002, that is, 0.2% What tensile load is required to cause yielding in a bar of the same material but with a diameter of 25mm? How does this value compare with the load at yielding in the 10mm diameter test specimen? Whydo the two values differ? NOTE: In Part (a), use Excel to generate the engineering stress-engineering strain curve. In addition, compute and plot true stress vs. true strain. Plot on the same graph as engineering stress vs. engineering strain so that you can clearly see the differences between the curves. Hand-drawn plots will NOT be accepted.

Explanation / Answer

3. Force and length change date are given in Table. P4.4 for the initial portion

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