Lab2

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University of Central Oklahoma *

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2143

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English

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Dec 6, 2023

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pdf

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11

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University of Central Oklahoma Tension Test - Experiment 2 Dylan Robinson, Joshua Jackson, and Kaleb Paddock Dr. Adnan Al-Ibadi Thursday 1:00 PM 9/29/22
Abstract Tension is used in many engineering applications. For example, a bridge deck might be suspended in tension using bound steel cables. In order for engineers to compare different materials’ tensile strength it is economically beneficial to test smaller pieces of material. For laboratory experiment 2, we took a specimen of aluminum in a dogbone shape, and applied a tensile load until the material failed. Using the Universal Testing Machine or ZPM, we collected data from the specimen during tensile loading. Values like displacement and force were collected. Given these values, we were able to determine the normal stress, strain, modulus of elasticity, and a few other values. Machines and Instruments ‘ Image 1’ shows the main machine used in this experiment. This machine will be referred to as the Universal Testing Machine or ZPM. The ZPM is able to take very precise measurements (down to the nearest 1/100 millimeter). This is obviously a very important tool to have access to when looking to determine stress, strain, and the modulus of elasticity - which are all the key components we are looking to resolve in this laboratory experiment. Without a test stand like this or similar, comparing different materials to one another would be significantly more expensive. By understanding how the ZPM works and how different materials compared to one another, engineers can perform complex trade studies at minimal cost.
Image 1: Test Specimen in ZPM Machine.
Experimental Method In this experiment, we rely heavily on the concepts of stress, strain, modulus of elasticity, and a few other key concepts specific to strength of materials. Here we conduct a tensile test on an aluminum specimen, and using the ZPM, collect the values of the precise force being applied as well as displacement seen in the Aluminum. Our part in the actual testing of the specimen was fairly limited, since we did not interact with the machine as far as calibration, and overall equipment setup is concerned. After the specimen is tested, we take the data given and compute our values. In this particular experiment, we ran into a few issues with the supports for the universal testing machine. The specimen was not able to lock into the machine properly, and we were forced to switch to a different machine, as shown below in Figure 2. This second, older, ZPM was limited in the tensile force it could apply. We were unable to fracture the material.
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