Torsion of Circular Shafts

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LAB REPORT: TORSION OF CIRCULAR SHAFTS Auther: Abullah Sami Submission Date: Abstract The present report outlines experimental work, theoretical background, and calculations of results from experimental data obtained during experimental torsional analysis of circular shafts. The experiment was conducted using two different shafts with different materials (aluminum and iron). The load elongation data obtained from the experiment is used to plot Twist angle Vs Torque and then Strain Vs Strain Plots. From these characteristics plots, useful information pertaining to mechanical properties of corresponding material is extracted. Subsequently, these parameters are compared with standard values. In the end, a useful discussion is made based on engineering knowledge and behavior of results. Introduction Torsion is one of the principle modes of deformation. It results in shear stress and shear strain. There are various examples of torsion loading in various engineering applications. Shafts in motors and gear systems undergo torsion loads. Torsion analysis is therefore an integral part of design study of most of the systems. Shear stress in circular shafts generates in plane shear stress in cross sectional plane. Thus a pure shear case exists. Present experimental work deals with torsional analysis of different shafts with varying geometries and materials. Aim Followings are the aims of this lab work: (a) To acquire understanding of torsional loading and deformation phenomenon in shafts. (b) To get load-deformation data for two different materials (c) To construct Shear stress Vs Shear strain plot (d) To find out various mechanical properties from the data. Theory During torsion loading, applied torque causes the component to twist. The twist is measured as twist angle which is related to applied torque by following equation:

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