As a design engineer you arc to choose a material for the fa

As a design engineer, you arc to choose a material for the fabrication of a rotor for an induction motor. Your choices are limited to the available materials in the table below. Based on experience, the order of importance of the attributes from most lo least are: yield point, coefficient of linear expansion a. bending strength (ii). corrosive resistance and cost, flic scale for corrosive resistance is set from I to 3, with 3 being highly resistant and 1 being least resistant. Determine the best choice for the material for the rotor using a mathematical attribute selection process. Justify your assumptions in the method using appropriate engineering judgment.

Solution

Stainless steel 302 is the best material according the order of importance given in the question because of the following reason:-

1. As 1st priority is yield point so among all stainless steel 302 has the highest yield point

2. 2nd priority is coefficient of linear expansion which should be less as, we don\'t want material to be elongate so, best choice is stainless steel 302 keeping in mind the 1st priority.

3. Than after come bending strength which should be large as much it can so, among the given material stainless steel has the highest bending strength.

4. 4th preference is corrosive resistant as we know stainless steel is not much corresive resistant as compared to alluminium alloy but, keeping in mind the above priority stainless steel is the best choice.

5. last priority is cost which should be less and stainless steel 302 has the less cost among all.