202 Lab Report 2 Pre-Lab

202 Lab Report 2 Pre-Lab - Tension(ksi Structural(ASTM-A36...

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Jeffrey Katz Lab Section 13 Pre-lab #2 Questions 1. The first sample is a popsicle stick/tongue depressor. This is used to measure crosshead displacement. 2. Stress = Load/Area of the middle area Strain = (final displacement – initial displacement) / initial displacement 3. The point of rupture for the popsicle stick and the metals should be clearly defined. However, the popsicle stick’s point of rupture should be right after the point of elastic deformation, as it is an extremely brittle material that should not plastically deform much at all. 4. It should be removed after the specimen yields a second time. At this point, the test is stopped and the extensometer is removed. 5. One inch from each end. 6. Tap it lightly with a brass block. 7. The Modulus of Elasticity for each material is as follows Steel E (ksi ) Yield Stress (in Tension) (ksi) Aluminum E (ksi) Yield Stress (in
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Unformatted text preview: Tension) (ksi) Structural (ASTM-A36) 29 36 Alloy 1100-H14 (99% Al) 10.1 14 ASTM-A709 (Grade 50) 29 50 Alloy 2014-T6 10.9 58 ASTM-A913 (Grade 65) 29 65 Alloy 2024-T4 10.6 47 ASTM-A992 (Grade 50) 29 50 Alloy 5456-H116 10.4 33 Quenched ASTM-A709 (Grade 100) 29 100 Alloy 6061-T6 10.1 35 Stainless, AISI 302 Cold-rolled 28 75 Alloy 7075-T6 10.4 73 Stainless, AISI 302 Annealed 28 38 Reinforcing Steel, Medium Strength 29 40 Reinforcing Steel, High Strength 29 60 The stiffness of the different steels is roughly the same. In U.S. units, the difference between the higher Young’s Modulus and the lower ones is about 3.45%. However, the load-carrying capacities of the materials is very different, with Quenched and Tempered ASTM-A709 (Grade 100) having the highest yield stress, and ASTM-A36 having the lowest load-capacity....
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