Lab #3 - Measuring Tensile Properties of Metal Specimens - Measuring Tensile Properties of Metal Specimens CE 206(C.E Lab#3 Conducted January 28th 2010

Lab #3 - Measuring Tensile Properties of Metal Specimens -...

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Measuring Tensile Properties of Metal Specimens CE 206 (C.E. Lab #3) Conducted: January 28 th , 2010 Submitted to: Prof. Brown, February 4 th , 2010 Tom Wienckowski Lab Group 3 Members: Andrew Dougan Kyle Fischer
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Table of Contents Page Abstract 3 Introduction 4 Methods and Procedures 4 Results and Discussion 6 Conclusions 12 References 12 Appendix 13 2
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Abstract Measurement of tensile properties of steel and aluminum provides engineers with the data for how much stress and strain each metal can withstand, and the difference in the properties of each of these metals. The objective of this lab was to measure and compare the strength and several elastic and nonelastic properties of steel and aluminum specimens, compare the measured values of each property to reference values reported in the literature, observe and compare the difference in the behavior of materials under load, and to study the types of fractures. The specimens were placed in a 30 kip tinius olsen testing machine and the strain was recorded from an extensometer. The results showed that the steel was more deformable and more ductile than the aluminum. The results will be used to compare the differences in the two types of metal tested during the lab. Introduction 3
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Steel and aluminum are metals that are often used in construction. Since they are so often used in the engineering field, their engineering properties are very important. Stress, strain, and elasticity are factors that an engineer should consider while using either of these materials for a project. The objective of this lab was to measure and compare the strength and several elastic and nonelastic properties of steel and aluminum specimens, compare the measured values of each property to reference values reported in the literature, observe and compare the difference in the behavior of materials under load, and to study the types of fractures. The metal specimens were tested to failure in tension in a 30 kip testing machine. An extensometer recorded the strain. The data was used to create a graph that shows the relationship between the stress and the strain of each metal. Methods and Procedures Each lab group was given two round metal specimens that were threaded at both ends. One of the specimens was manufactured out of steel, and the other specimen was manufactured out of aluminum. First, the diameters of both specimens were recorded by using a dial calipers. A 2 inch gage punch was used to make 2 inch gage marks on each specimen so after the tests were completed the distance between the 2 marks could be measured to determine the percent elongation of each specimen. The specimens were loaded into the testing machine by putting the specimen in vertically and screwing both the top and bottom threaded ends into the machine. Both ends had to be inserted with the same amount of the threading in the machine as to not cause the specimen to have more strength on one end than the other. The extensometer was installed on the center of the 4
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  • Spring '10
  • BROWN
  • Tensile strength, percent elongation, Area Group 1 Group, Rupture Str., Tom Wienckowski Lab Group, Yield  Strength

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