Abstract
The Performance Efficiency of a Material (MPE) in a given engineering component is taken as the sum total of the performance indices of the material for various required properties and mandates of design. The performance index for a property is defined as the product of the weight (W) of the property among all the requirements (weight being distributed out of 100 total points among all of the required properties and factors) and satisfaction index (SI), a parameter ≤1.0 that defines how efficiently the property of the material satisfies the requirement imposed by design. New methods are given in this paper for estimating the weights and SIs of the various required properties and evaluating the MPE for a chosen material in an engineering application. The method is illustrated considering the steel in use in a low-pressure steam turbine rotor and its possible replacement with a lighter-titanium alloy.
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