Pseudo-life-based test method of mechanism consistency boundary for accelerated degradation testing

A pseudo-life-based test method of mechanism consistency boundary for accelerated degradation testing was proposed, according to mechanism consistency condition for lifetime random variables. Based on the pseudo life estimates, an F statistic was established to test the homogeneity of degradation mechanism characteristic parameters, where the characteristic parameter is logarithm standard deviation for log-normal distribution and shape parameter for Weibull distribution. And the exact rejection region was given. Using the F statistic, mechanism consistency test was done level by level from lower to higher, until the consistency condition was unsatisfied or the pseudo life estimates at all levels had been analyzed. Then, the stress level of mechanism consistency boundary was determined. This method can make good use of the transverse information from the degradation mechanism consistency between different accelerated stress levels, and effectively increase test precision. It has been used to determine the thermal degradation mechanism consistency boundary temperature for a coating flat glass, and the results show the rationality and validity of the presented method.