Essay by seavoyz March 2014

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In engineering mechanics, torsion is often referred as the twisting effect caused by an applied torque on an sections perpendicular to the torque axis, the result shear stress in this section is perpendicular to the radius of the object. Considering a shaft is subjected at two ends with equal in magnitude but opposite in direction torques, as noticed, the shaft will experienced deformation where the shaft is twisted, when these happens, the shaft is said to be in torsion. Torsion is crucial for young engineers like us to understand as it encounters in many engineering applications. The most common application is transmission shafts, which are function as work transmitter to transmit the work from one pointer to another, you can found the transmission shafts easily in engineering industry, for example vehicles, turbines, etc. So, it is imperative for us to have an early exposure to the topic and understand the properties of torsion through the experiment as it will facilitate us in the machine designing in the future.

Considering a system which consists of a steam turbine, and electric generator connected by a transmission shaft. In the industry, steam will be produced by combustion and run into the steam turbine, the work is done on the turbine fins and caused power to be transmitted to the electric generator so that the kinetic energy can be converted into electricity for further usage. During the power transmission from the turbine to the electric generator, the turbine exerts a twisting couple or torque on the shaft and the shaft exerts an equal torque on the generator. At the same time, the generator reacts by exerting the equal and opposite torque on the shaft, and the shaft by the torque on the turbine. If the torque is small, no deformation will occur...