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Lifetime estimation of nitrile butadiene rubber O-rings under storage conditions using time-varying copula

Author

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  • Jun Pan
  • Guanghan Bai
  • Wenhua Chen

Abstract

With several attractive properties, nitrile butadiene rubber O-rings have been widely used as compression seal components in various critical engineering systems. Therefore, it is important to obtain an accurate lifetime estimation of the nitrile butadiene rubber O-ring. In this study, aiming to estimate the lifetime of a nitrile butadiene rubber O-ring under storage conditions, a reliability model is developed by considering two performance characters, namely, compression set and compressive stress relaxation. With a long lifetime in storage, a constant-stress accelerated degradation testing is conducted to obtain the degradation model for each performance character. In addition, the statistical dependency between the two performance characters is considered, and a bivariate time-varying copula model is used to capture this relationship. An efficient two-stage approach is proposed to construct a suitable time-varying copula function. By comparing with previously reported time-varying copulas, it can be proved that the time-varying copula constructed using the proposed approach achieves a better goodness of fit.

Suggested Citation

  • Jun Pan & Guanghan Bai & Wenhua Chen, 2018. "Lifetime estimation of nitrile butadiene rubber O-rings under storage conditions using time-varying copula," Journal of Risk and Reliability, , vol. 232(6), pages 635-646, December.
    • Handle: RePEc:sae:risrel:v:232:y:2018:i:6:p:635-646
    DOI: 10.1177/1748006X18757073
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    References listed on IDEAS

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