A rectangular steel bar will be loaded axially in tension using (roughly) force increments of 2500lbs up to a maximum force of 15,000 lbs. Apply two strain gages, one aligned longitudinally andone transversely, to measure the axial and transverse strains of the section at each loadincrement via a strain indicator. Do this for both loading and unloading.
(at each increment)- Axial stress- Axial strain- Poissons ratio- Modulus of elasticity, E- Shear modulus, G- Volume of the bar- Unit volume ratio, eRequired Plots- Axial stress vs. axial strain, axial stress vs. transverse strain (same plot)- Transverse strain versus axial strain
Using the values you calculate for E, G, and ? determine what material was tested via a tabulatedsource (such as that in the appendix of your strength of materials textbook). Using your judgment, selectan appropriate yield stress and determine at what longitudinal strain your calculated value of Poissonsratio is no longer valid. Based on your physical observations from Lab 1, would you expect Poissonsratio to increase or decrease after this point? Justify your answer.Also, could a digital caliper with accuracy of ±0.0005in be used in place of the strain gages to measurethe thickness of the cross-section? Explain.
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