RELIABILITY EVALUATION AND OPTIMIZATION USING STRESS-STRENGTH INTERFERENCE THEORY

Abstract

I9tress- Strength Interference Theory" can be used as s. basic tool for component reliability design. It considers Stress Strength parameters of a component as random variables. Using this concept, sous Stress.* Strength distributions bane been discussed for realistic, situations. Reliabi .ity evaluation, basically requires the closed togs of reliability expressions, for various stress•»sttrength distributions and their combinations. Several reliability ex-pressions are derived, for generally observed stress-strength distributions, using Interference Theory concept.' A computer progr ms has been developed for the relative study of thew Complex stress- strength models, considering practical oases, are discussed in details. Thff help considerably in the co*pleX rel ability design process.' The models can be developed further for specific stress- strength distributions. An efficient and economic reliability design is achieved through List minimisation ! thods. Reliability optimisation models are developed for 'Normal' and 'Exponential' eases. based on these models, a computer program has also been developed which provides fast and accurate results.