Increasing loads were applied while staying right below the yield points. At every load, the force value as well as the extensometer reading was recorded. The recorded data was used for calculations.On each metal, some load was exerted. After calculating aluminium, the following were confirmed: yield stress was 314.47 MPa, the ultimate tensile stress was 341.47MPa, the true stress at fracture was 605.63MPa, the breaking stress was 266.89Mpa, %EL (percentage of elongation) was 15.8 percent and the percentage area reduction was 55. The calculation of copper yielded the following results: the yield stress was 255.89MPa, the ultimate tensile stress was 319.40 MPa, the breaking stress was 198.04MPa, the true stress at fracture was found to be 745.84MPa, the percentage of elongation or the %EL calculated to 15.8 percent and the percentage area reduction was 73.Within the second part of this experiment, an extensometer was made use of to measure the strain caused elongation within the region of elasticity. For both the copper and the aluminum, a graph for stress against strain was calculated and plotted. The outcome slope was representing the relative stiffness (the elasticity young modulus) for both the copper and the aluminum metals. The young’s modulus of elasticity for the copper material was 156. The young’s modulus of elasticity for the aluminum material was 303.After comparison between the copper and the aluminum in terms of strength and ductility, interesting correlations between the fracture surfaces and the results measured were observed. In the order of increasing the tensile strength and decreasing of the ductility, copper was ranked higher followed by aluminum. These results do agree with the values of callister. A major difference of between two hundred percent (200%), and three hundred percent (300%) between the calculated values or calculated data and the values that are published was revealed. It proved difficult to select an alloy composition with which to compare the data, however, not many values do correspond in whatever form. The young modulus of elasticity tensile strength, yield strengths as well as the percentage of elongation values for both the copper and the aliminium found in the first experiment and the second experiment were different from the values stated within the Callister text book anywhere from two hundred percent to three hundred percent depending
Callister , D.W. (2007) Materials Science and Engineering an Introduction 7th Ed. York: John
Wiley & Sons Inc.
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