Youngs Modulus of a Steel Wire - by James Wilson

2162 Words9 Pages
4.5. Young’s Modulus of a Steel Wire. Objective: James Wilson. 2011. To perform a practical experiment in which a number of tests will be performed measuring how much a steel wire extends as increasing force is applied to it. Using the results/data obtained from these tests, comparisons and calculations will be made in table and graph form. These results will enable a calculation of Young’s Modulus. Using my own output of Young’s Modulus, further research will be endured into how this concept relates to: Hooks law, Elastic limit, Ductile and brittle behaviour, Elastic and plastic behaviour of materials. 1 figure (a): device representing Searl’s apparatus. figure (b): close up of measuring components on the apparatus. 2 Apparatus: The tool used to perform the action of stretching the steel wire is a metallic device that is based on Searl’s apparatus, figure (a), which consists of: Two hanger structures each suspended from a ceiling by equal length steel wires. Although these hangers are attached to each other mechanically, they operate independently as separate structures, whilst also working in unison creating a tool capable of gathering sufficient data to calculate Young’s Modulus. The tool’s capability to do this relies on a measuring device in the form of a wheel and scale fitted to one of the hangers. The scale on this wheel contains measurements divided into 50 graduations, each being 0.01 millimetre, therefore one complete revolution of the wheel moves the spindle a distance of 0.5 millimetres. In addition, residing next to the wheel and scale is a measuring vernier, enabling the device to read measurements to within 0.001 millimetre. The purpose of the wheel and scale is to create a raising and lowering action of a bolt that manipulates a spirit level fitted to the top of the device between the two hangers. Each hanger has the ability to

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