Longitudinal Round Tensile Test Paper
1. Longitudinal Round Tensile Test (ASTM E8)
The purpose of ASTM E8 was to determine important properties of the metal specimens. The diameter and initial gage length were measure before the specimens were tested. The samples that underwent tensile loads were Cold Rolled Steel, 2024-T351 Aluminum, and Grey Cast Iron. The tensile test was carried out and when the specimen reached failure, its broken pieces were removed. Their failure diameter and final gage length were measured and recorded. From the date recorded from the tensile tests, the following properties were calculated: Stress at Johnson’s Apparent Elastic Limit, Yield stress at 0.20% and 0.05% offset, Ultimate/failure stress, Ultimate/failure strain, Modulus of Elasticity, Modulus
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The Charpy Impact Test required to the machine to overcome the friction while swinging. Therefore, the machine was calibrated by releasing the heaving hammer, and it swung freely to one full swing. This previous process allowed the machine to utilize energy to overcome friction. Once the machine was calibrated, the hammer was located and locked at a certain height. The hammer was leased and it impact the specimen supported at its two ends. The machine indicated the energy required to impact and brake the metal specimen. The Charpy test was run over 1045 Cold Rolled Steel, 2014-T351 Aluminum and Grey Cast Iron. The machine breaks were not working properly, therefore this could have a caused a systematic error while performing the test. The average energy used to overcome the friction in the machine was 37.33 ft-lbs. And, the specimen with the highest fracture energy was Aluminum, 40ft –lbs. On the other hand, the fracture energy for steel was 8.7ft-lbs. The lowest fracture energy from all the …show more content…
By doing the Rockwell “B” and “C”, the hardness of the metal samples were measured. The needles used for the Rockwell test were, steel ball for “B” and a diamond cone for “C”. The highest Rockwell “B” Hardness number, average, was 71.214 for a 1045 Cold Rolled Steel sample. Additionally its Ultimate tensile strength was 6.38E4 psi, the highest ultimate tensile strength from all the metal
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