Abstract
Electrical sliding contacts in electrical motors and generators are subjected to severe friction and wear conditions. Conventional materials such as carbon and electrographite do not have longer life due to the generation of carbon dust. This creates environmental pollution and also affects the operation of an electrical machine. Aluminium-graphite composites are well suited for such applications. However, the life of the components made out of aluminum-graphite composite is to be evaluated in order to optimize their performance at the design stage itself. Traditional life data analysis at normal usage conditions is time-consuming. In the present study, aluminum-graphite composites were manufactured through the energy-efficient microwave sintering, and the life of components was estimated using Accelerated Life Testing (ALT) procedure. The experimental wear data were analyzed using an inverse power law model. Reliability and failure rate models were developed using the time-to-failure data. Life at normal usage conditions was predicted using these models. The calculated reliability at normal usage conditions was more than five years at a 99% confidence limit.
Published Version
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