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Published in:
2013 | OriginalPaper | Chapter
10. Stochastic Models for Environmental Stress Screening
Authors : Maxim Finkelstein, Ji Hwan Cha
Published in: Stochastic Modeling for Reliability
Publisher: Springer London
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Abstract
There are different ways of improving reliability characteristics of manufactured items. The most common methodology adopted in industry is burn-in, which is a method of ‘elimination’ of initial failures (infant mortality). As was mentioned previously, the ‘sufficient condition’ for employing the traditional burn-in is the initially decreasing failure rate. For example, when a population of items is heterogeneous, and therefore consists of subpopulations with ordered failure (hazard) rates, it obviously contains weaker (with larger failure rates) subpopulations. As the weakest populations are dying out first, the failure rate of this population is often initially decreasing and burn-in can be effectively applied.