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Tensile Test - TENSILE TEST 1 Objective To perform tensile...

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TENSILE TEST 1. Objective: To perform tensile testing of Aluminum and steel samples. 2. Brief Description of the experimental Procedure: Tension tests provide information on the strength and ductility of materials under uniaxial tensile stresses. The schematic of the test is given in the Figure 2. The test was carried out at room temperature. Two standard tensile specimens with circular cross- section were tested. The specimen had a reduced uniform machined section in order to confine deformation to the narrow region during testing; it also reduces the probability of fracture at the ends of the specimen. The diameter of the reduced section complied with the standard requirement of approximately 12.7 mm in diameter and a length at least four times this value. The diameter was measured in five different spots along the reduced section to determine cross-sectional area of the specimen; gage marks were punched and their separation was measured to establish the initial length for the testing procedure. A gripping device for threaded specimens was used. The speed of testing was 5.08mm/min. An extensometer measured the specimen elongation during the initial part of the test and was removed at a measured 10% elongation. The specimen was then tested until the point of fracture. The two broken ends of the specimen were repositioned back together to measure the final length of the gage marks and final necking diameter. The results from the machine were analyzed to estimate various mechanical properties. 3. Schematic Drawing: Figure-2 Schematic for Tensile test 2
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3 4. Examined Material: Two samples were examined Steel A36 and Al 6061. 5 & 6 . Various measurements : Aluminium (inch) Aluminium(mm) Steel (inch) Steel (mm) Initial Length lo 2.01 51.054 2.01 51.054 Final Length l B 1 B 2.537 64.4398 2.745 69.723 Initial Dia do 0.506 12.8524 0.506 12.8524 Final Dia d B 1 B 0.328 8.3312 0.308 7.8232 Displacement rate Vd 0.2 inch/min 0.084 mm/s 0.2 inch/min 0.084 mm/s Gauge length Go = 2 inch = 50.8 mm Gauge length of extensometer = 1 inch = 25.4 mm RESULTS: For both the samples the extensometer reading was used to calculate various parameters. In the machine generated values of time, load and strain, it was found that at the beginning up to certain time the load and strains are negative. Probably the machine was not stable at the startup. So these values were discarded. After the fracture has taken place, after about 10% strain, the values of strain drops to negative again. So these values were also neglected to generate clear and nice plot.
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