Staircase Testing - Confidence And Reliability
Author(s)
B. R. Rabb
Abstract
The aim of the fatigue analysis is to obtain a reliable design using the mean value
of the fatigue limit reduced to the appropriate probability of failure as the allowed
stress amplitude. This reduction requires a thorough knowledge of both the population
mean and the population standard deviation. Furthermore, the correct probability
distribution of the fatigue limit must be anticipated. Fatigue testing is
required to obtain reliable estimates of the fatigue limit and standard deviation.
The staircase or up-and-down test method is usually used. The obtained sample
values must be transferred to population values by applying the rules of statistics,
i.e. by applying confidence levels. However, due to the nature of the staircase test,
it is very difficult to obtain a correct value of the sample standard deviation. This
can be demonstrated by deriving the cor
Keywords
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