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An approach in determining the critical level of degradation based on results of accelerated test

Hoang Anh D., Vintr Zdenek, Valis David, Mazurkiewicz Dariusz

Eksploatacja i Niezawodność

2022

Vol. 24, no. 2

330--337

Nowadays, systems are more complex and require high reliability for their components, especially critical system components. Therefore, to avoid serious damage, system are often replaced before the actual failure. The replaced parts are considered to have “soft failure”, and the limit in which the parts are replaced is known as the critical level of the degradation process. Determining the appropriate value of the critical level for a product is an important problem in their exploitation, as well as for predicting the Mean Time to Failure (MTTF) or Remaining Useful Lifetime (RUL) of this product based on the degradation data by the mathematical models. In this article, an approach in determining the critical levels based on failure data from an accelerated test is introduced. This approach is applied with the degradation process of Light-Emitting Diodes (LED) in an accelerated test and a type of Wiener process-based model is used to predict the MTTF or RUL of LED based on their degradation data and the found critical level.

Ocena krytycznego poziomu uszkodzeń mrozowych w tworzywie ceramicznym

Backiel-Brzozowska B., Nikitsin V.

Inżynieria i Budownictwo

2011

R. 67, nr 6

338-340

Na podstawie wyników badania kinetyki procesu kumulowania uszkodzeń mrozowych w tworzywach ceramicznych wykazano, że moment przejścia procesu z etapu powolnego do lawinowego wyznacza poziom krytyczny, który może być przyjęty jako ocena mrozoodporności. Przedstawiono sposób wyznaczenia tego kryterium. Zaproponowano metodę oceny mrozoodporności, w której rejestruje się jedynie moment pełnego zniszczenia próbek.

Based on experimental results of damages cumulation in ceramic material caused by cyclic freezing and thawing, it was shown that the time of transition the material degradation process from the first stage to the second one assigns the critical level of damages cumulation, which can be assumed for evaluation of frost resistance. The method of this criterion determination was described. The method of frost resistance evaluation.