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Stress-strain data are plotted in Fig. P4.5 for the initial portion of a tension test on AISI 4140 steel tempered at 538?C (1000?F). Note that data points A and B are labeled with their stress-strain coordinates.
(a) Determine the elastic modulus E.
(b) If a bar of this material 100 mm long is strained to point A and then unloaded, what is its length at point A and also after unloading?
(c) If a sample of this material is strained to point B and then unloaded, what is the plastic (permanent) strain that remains after unloading?
(d) Repeat (b) where the bar is instead loaded to point B and then unloaded.
A quality control inspector chooses a part to be tested. The part is then declared acceptable, repairable, or scrapped. Then another part is tested.
Each situation should be considered independently. In discussing each situation, ignore the other.
how does his principle of liberty remedy this oversight?
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