Consistency analysis of degradation mechanism in step-stress acc elerated degradation testing

• Autorzy: Lu X. , Chen X. , Wang Y. , Tan Y.

Identyfikatory

DOI

10.17531/ein.2017.2.19

Warianty tytułu

PL

Analiza niezmienności mechanizmu degradacji w przyspieszonych badaniach degradacji z obciążeniem stopniowym

• Języki publikacji: EN

Abstrakty

EN

Step-stress accelerated degradation testing (SSADT) has been used by many researchers for the reliability assessment of highly reliable products. Most of the previous works on SSADT assume that the degradation mechanism keeps unchanged during the accelerated degradation testing. However, some recent investigations have shown that degradation mechanisms may be different among various accelerated stress levels. For an accurate extrapolation of accelerated testing results to the ambient condition, the degradation mechanism at all accelerated stress levels should be the same. Taking the variation of the degradation mechanism into account, it is advisable to test the degradation mechanism consistency in a SSADT. This paper proposes a likelihood ratio test method for the consistency analysis of degradation mechanism in the SSADT. We first introduce the basic principle of the likelihood ratio test method. Then we describe the model for SSADT data and the parameter estimation method. Further, we propose a decision rule for the consistency analysis. The proposed method is illustrated and validated with examples on the consistency analysis of degradation mechanism in a SSADT of silicone rubbers.

PL

Wielu badaczy wykorzystuje przyspieszone badania degradacji z obciążeniem stopniowym (ang. step-stress accelerated degradation testing, SSADT) do oceny niezawodności wysoce niezawodnych produktów. Większość wcześniejszych prac nad SSADT zakłada, że podczas badań przyspieszonych mechanizm degradacji pozostaje niezmienny. Jednak, najnowsze badania wykazały, że mechanizmy degradacji mogą różnić się w zależności od poziomu przyspieszonego obciążenia. Poprawna ekstrapolacja wyników badań przyspieszonych na warunki otoczenia wymaga aby mechanizm degradacji przy wszystkich poziomach obciążenia był taki sam. Biorąc pod uwagę zmienność mechanizmu degradacji, wskazane jest badanie stopnia (nie)zmienności mechanizmu degradacji w badaniach SSADT. W artykule zaproponowano metodę analizy niezmienności mechanizmu degradacji w badaniach SSADT opartą na teście ilorazu wiarygodności. W pierwszej kolejności, przedstawiono podstawową zasadę testu ilorazu wiarygodności. Następnie, opisano model dla danych SSADT i metodę estymacji parametrów. Ponadto zaproponowano regułę decyzyjną stanowiąca narzędzie do analizy niezmienności. Omawianą metodę zilustrowano i zweryfikowano na przykładzie analizy niezmienności mechanizmu degradacji w badaniach SSADT gumy silikonowej.

Słowa kluczowe

EN

step-stress accelerated degradation testing; degradation mechanism consistency; likelihood ratio test; rubber seals

PL

przyspieszone badania degradacji z obciążeniem stopniowym; niezmienność mechanizmu degradacji; test ilorazu wiarygodności; uszczelka gumowa

• Wydawca: Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne
• Czasopismo: Eksploatacja i Niezawodność
• Rocznik: 2017
• Tom: Vol. 19, no. 2
• Strony: 302--309
• Opis fizyczny: Bibliogr. 30 poz., rys., tab.

Twórcy

autor

Lu X.

• Laboratory of Science and Technology on Integrated Logistics Support College of Mechatronics and Automation National University of Defense Technology Yanwachi str., 47 Changsha, 410073, China

autor

Chen X.

• Laboratory of Science and Technology on Integrated Logistics Support College of Mechatronics and Automation National University of Defense Technology Yanwachi str., 47 Changsha, 410073, China
• [e-mail]

autor

Wang Y.

• Laboratory of Science and Technology on Integrated Logistics Support College of Mechatronics and Automation National University of Defense Technology Yanwachi str., 47 Changsha, 410073, China

autor

Tan Y.

• Laboratory of Science and Technology on Integrated Logistics Support College of Mechatronics and Automation National University of Defense Technology Yanwachi str., 47 Changsha, 410073, China

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