A generalized equivalent temperature model in a time-varying environment

• Autorzy: Sun L. , Gu X.-H. , Song P. , Di Y.

Identyfikatory

DOI

10.17531/ein.2017.3.14

Warianty tytułu

PL

Uogólniony model temperatury równoważnej w zmiennym w czasie otoczeniu

• Języki publikacji: EN

Abstrakty

EN

Accelerated degradation test at high temperature level is a common method to accelerate the degradation of products by elevating temperature, and the obtained degradation data are then used to obtain the estimate of the performance at normal temperature after extrapolating the degradation through accelerating model. However, the normal temperature is ever-changing rather than constant. Therefore, a generalized equivalent temperature model based on power law degradation path is proposed to establish a connection between accelerated degradation data and degradation data at normal temperature. The model takes the equal degradation measure as a principle and the conclusion is demonstrated that the increments of the degradation under the same magnitude, same time and different orders of temperature stresses are same. The result shows that the empirical equivalent temperature model is a special case of the proposed model. The accuracy of the proposed model is finally demonstrated by a case study of nitrile rubber O-rings.

PL

Przyspieszone badania degradacji (badania starzeniowe) prowadzone w warunkach wysokiej temperatury stanowią powszechnie stosowaną metodę przyspieszania starzenia produktów poprzez podwyższanie temperatury. Otrzymane w takich badaniach dane degradacyjne wykorzystuje się do szacowania wydajności produktu w temperaturze normalnej na zasadzie ekstrapolacji. Głównym ograniczeniem tej metody jest fakt, że normalna temperatura nie jest stała lecz zmienia się w czasie. Dlatego też, aby skorelować dane z przyspieszonej degradacji z danymi dotyczącymi starzenia w normalnej temperaturze, zaproponowaliśmy uogólniony model temperatury równoważnej oparty na krzywej degradacji opisanej prawem potęgowym. W modelu przyjęto zasadę równego stopnia degradacji i wykazano, że przyrosty degradacji przy tej samej wartości i czasie działania naprężeń termicznych różnego rzędu są takie same. Wyniki pokazują, że empiryczny model temperatury równoważnej jest szczególnym przypadkiem proponowanego przez nas modelu. Trafność opisanego w pracy modelu wykazano na podstawie studium przypadku dotyczącego uszczelek nitrylowych, tzw. oringów.

Słowa kluczowe

EN

accelerated degradation test; equivalent temperature; nature storage; degradation path; rubber Orings

PL

przyspieszone badania starzenia; temperatura równoważna; przechowywanie w warunkach naturalnych; krzywa degradacji; oringi nitrylowe

• Wydawca: Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne
• Czasopismo: Eksploatacja i Niezawodność
• Rocznik: 2017
• Tom: Vol. 19, no. 3
• Strony: 432--440
• Opis fizyczny: Bibliogr. 24 poz., rys., tab.

Twórcy

autor

Sun L.

• College of Mechanical Engineering Nanjing University of Science and Technology no. 200, Xiaolingwei Street, Nanjing, China

autor

Gu X.-H.

• College of Mechanical Engineering Nanjing University of Science and Technology no. 200, Xiaolingwei Street, Nanjing, China

autor

Song P.

• Science and Technology on Combustion and Explosion Laboratory Xi'an Modern Chemistry Research Institute no. 168, Zhangba East Street, Xi'an, China

autor

Di Y.

• College of Mechanical Engineering Nanjing university of Science and Technology Nanjing 210094, China

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