Torsional shafts play very important role in transferring torque from one location to another. They are widely used in power plants, manufacturing industries, automobile and many other machineries. In recent years, due to cutting edge competition among industies, demand of energy efficient and cost effective components have gone up. Application of optimization tools to satisfy these criteria has become common features in modern designs. It is to be noted that most of the design engineers are not versed in optimization hence designs due to them are often not optimized. To make the optimum design process within their reach, a new method of torque map is proposed here. For the given torque, outer diameter or its wall thickness can be selected from the map which will provide the most economical design. To generate data for developing this map, stress criteria is minimised subject to the geometrical constraint. This non-linear constrained problem is solved using genetic algorithms. Application of the 'Torque Map' is demonstrated through five examples.
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