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ME 220 – Mechanics of Materials LaboratoryTest Title: Torsion TestTest Date: February 20, 2018Date Report Submitted: February 27, 2018Name: Section:
Summary:The torsion test served as another method for obtaining the stress-strain relationship for a metal. Compared to the previously used method of the tension test, the torsion test is more preferred as the shear stress and strain are obtained directly from this test. This is because all deformation of ductile materials is by shear. The primary goal of this lab was to determine the behavior of different materials when subjected to torsion and to obtain some of their properties based on how the materials reacted. To begin this experiment, we first took the initial diameter and gauge lengthof both the A-36 Steel and Cast Iron. We then loaded the A-36 steel into a twistingmachine that is able to measure the torque applied to the specimen. While this test was going on, an excel spreadsheet was used to record the torque, angular displacement and number of revolutions. Eventually the machine rotated until theA-36 Steel broke. The same process was repeated with the Cast Iron until it broke. The final diameter and gauge length measurements were recorded with the broken pieces of the A-36 Steel and Cast Iron. From this, a stress vs. strain diagramis able to be produced for both materials.After completing this experiment, we were able to deduce that the A-36 steel was the ductile material as it took around 4 and one-half rotations for the specimen to break as it took quite some time. Cast Iron, on the other hand, broke