Introduction: The objective for the lab was to determine properties of materials by using a tension test. The properties that were determined was Young’s Modulus, ultimate tensile strength, and yield strength. Three aluminum alloys were tested. The first was the AA 2024 , which is high strength used in aerospace applications. The second specimen was AA 5052, which had low strength, but high ductility. The last specimen used was AA 6061, which has moderate strength and is highly resistant to corrosion.
Procedure: To test each specimen, a tension test machine was used. Three specimens were tested: AA 2024, AA 5052, and AA 6061. The machine was set to 0 the force before the specimen was set into the machine. Each specimen was set into the machine, lining up the bottom of it with the the second pair of dots on the grasp. The top grasp was lowered to line the top of the specimen with the second row of dots on the upper grasp. Once in place and tightened, a strain gauge was attached to the specimen to measure how much
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Table 1: 2024T351 Specimen Experimental Data
The experimental ultimate tensile strength of 65,507.15 Psi is relatively close to the typical tensile strength of 64,000 Psi with 2.35 percent error. The experimental young's modulus of 10,644,380 Psi is close to the standard elastic modulus of 10,600,000 Psi with 0.42 percent error. Using the graphs, the yield stress was found using a 0.2% offset. The yield stress was found to be about 50,000 Psi, far from the standard 42,000 Psi. This resulted in a 19.05 percent error. Figure 1 shows the load versus extension and Figure 2 shows the stress strain curve.
Figure 1: Load as a Function of Extension of AA 2024T351
Figure 2: Stress as a Function of Strain Graph of AA 2024T351
AA 5052-0
The material properties of alloy AA 5052-0 is shown in Table 1.
Table 2: 5052-0 Specimen Experimental