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Unformatted text preview: ME 220 MECHANICS OF MATERIALS LAB Torsion Lab Test: October 11 th , 2007 Submitted: October 18 th , 2007 Matthew Olsen Section 3 Summary Like the tension test previously, the torsion test is another method of obtaining the stressstrain relationship of a material. However, while the tension test provides the tensile strain and tensile stress, the torsion test provides the shear stress and shear strain directly, which makes this test the preferred method in obtaining said data. Along with the shear data, the modules of resilience and rigidity will also be obtained. To perform this test, a metal rod was fastened to a torsion machine. A troptometer was then used to measure the angle of rotation. Then torsion was applied until the material fractures. The torsion readings as well as the angular deformation were collected and used to calculate the stress, strain, and modules. As expected, the steel performed as a ductile material. The material exhibited elastic behavior up to 2600 inlbs, giving very little deformation, measuring an angle of 0.069 radians, before yielding took over. At the 2800 inlb mark, the specimen gave in to plastic deformation, jumping from the 0.069 radians to 1.11 radians. At the point of fracture, the material had completed 4.84 revolutions with a maximum torsion of 5800 inlbs. The stress and strain at this point were 55819.13 psi and 2.53 in/in respectively. torsion of 5800 inlbs....
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 Fall '07
 Ding
 Arc Length, Shear Stress, Strain, Stress, Torsion, maximum shear stress, Matthew Olsen

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