Abstract
The present paper has investigated the effects of parameters in the in-service inspections (ISI's) of time-based maintenance (TBM) or periodic maintenance on the rupture probability of a structural component subjected to creep. It is assumed that creep strain monitored in-service at regular time intervals to be a random variable following two-parameter Weibull distributions of the means and the standard deviations given by the modified θ method. The effects of such parameters as the allowable strain, the rupture strain and the shape parameters of the Weibull distributions on the rupture probability of the structural component is formulated based on Bayes' theorem and is calculated considering the replacement of the component in a total operation hour of 105 hr. The replacement model simulates TBM in which creep strain of a component is found to reach the allowable strain level and is replaced with a new one having zero creep strain. Variations of the rupture probability of the model with the parameters above were calculated and discussed.
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