lab report - CE 350 -1- February 19,2008 Tension Experiment...

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February 19,2008 Tension Experiment Andy Bennett, EI CE 350 Section # 1 Table of Contest CE 350 - 1 -
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Section Page number Abstract 3 Introduction 3 List of Materials 4 Procedure 5 Results 6 Discussion 10 Conclusion 12 References 13 Abstract CE 350 - 2 -
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This report is performed to analyze the experiment of tension test. This test is performed to know the properties of different materials to use them safely in the environment according to their mechanical properties. The specimens that were used in this experiment are steel, brass, and aluminum. In order to test these specimens, the initial measurements of each specimen including length and diameter were measured by using caliber and extensometer. Then, each specimen separately were placed in the testing machine to be tested. This machine was connected to controller and to computer. The computer was recording the data while the specimen was tested. From this data, many important things can be obtained including the stress and the strain. Since the stress and the strain were obtained, the diagram of stress-strain can be plotted. The most important results can be obtained from the plot like the proportional point, yield stress, ultimate stress, fracture stress, the modulus of elasticity, The percent elongation and the percent reduction in area, and modulus of resilience. After all these obtained, it can be noted that the steel is the most stiffness specimen because it has the highest modulus of elasticity and the steel also is the most ductile specimen over the three specimens because it has the highest elongation and reduction in area percents. That can explain why the steel is commonly used today in many different applications. The percent errors in values varied from one value to another but in usual the most values were acceptable. Introduction The report covers a very important experiment in the engineering community. In this experiment, there is a test called the tension or compression test. This test is performed on three different materials which are steel, brass, and aluminum. The tension CE 350 - 3 -
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test usually is performed to get many mechanical properties of the material that is being tested. Many important things can be determined by this test like the relationship between the average normal stress and the average normal strain. The stress – strain diagram can be obtained from this experiment. Since the diagram is found, many properties can be found. These properties include proportional limit, yield point, ultimate strength, fracture strength, modulus of elasticity, percent elongation, percent reduction, Poisson’s law, and modulus of resilience. From these properties, many values can be obtained and these values can indicate many important points about the material tested. For example, a specimen under compression test can return back to its original shape unless it exceeds the proportional point or the elastic region. Also, a specimen deforms permanently when
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lab report - CE 350 -1- February 19,2008 Tension Experiment...

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