Experiment5 - Experiment # 5 Title: Torsion Testing Name:...

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Experiment # 5 Title: Torsion Testing Name: Matthew Lingam Division #: 8 Date: 3/2/10 TA’s Name: Chaitanya Synopsis : During this experiment three samples placed in a machine that would then apply a twisting torque to the materials. These samples included an 8.5” long cylinder of 1020 HR steel with a diameter of 1.1018”, a 4.75” long cylinder of polystyrene with a diameter of 0.625”, and a 4.75” long cylinder of 1020 CR steel with a diameter of .6225”. This experiment was done to determine the strain on the samples when a certain amount of torque was applied to the material. After all of the data had been recorded the results showed that the average shear modulus of the 1020 HR was 44.15 psi. When testing the other materials, only results were recorded. The polystyrene broke at 97.74°and at a torque of 447 lbs. The 1020 CR broke at 1137.7° and at a torque of 3839 lbs.
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Objectives : The objective of this lab was to understand that when a torque is applied there is shear stress that is caused by it. This is important to understand to help when trying to pick a material that will be twisted a lot throughout time to help determine which materials to use for that certain job of twisting. This lab also helped in determining the relationship between the shear stress of an object with torque and the shear strain; this ends up resulting in the shear modulus. Another
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This note was uploaded on 03/24/2010 for the course ENGR 231 taught by Professor Weiss during the Spring '10 term at Purdue North Central.

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Experiment5 - Experiment # 5 Title: Torsion Testing Name:...

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