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A Study for Lifespan Prediction of Expansion by Temperature Status

온도상태에 따른 신축관 이음의 수명예측에 관한 연구

  • Oh, Jung-Soo (Division of Machinery Testing Center, korea Testing Certification) ;
  • Lee, Bong-Soo (Division of Machinery Testing Center, korea Testing Certification)
  • 오정수 (한국기계전기전자시험연구원 기계금속센터) ;
  • 이봉수 (한국기계전기전자시험연구원 기계금속센터)
  • Received : 2018.08.14
  • Accepted : 2018.10.05
  • Published : 2018.10.31

Abstract

In this study, an expansion joint that is susceptible to waterhammer was tested for its vibration durability. The operation data for the hydraulic actuator was the expansion length of the expansion joint when the waterhammer occurred. In the case of the vibration durability test, the internal temperature status of the expansion joint was assumed to be a stress factor and a lifespan prediction model was assumed to follow the Arrhenius model. A test was carried out by increasing the internal temperature status at $30^{\circ}C$, $50^{\circ}C$, and $65^{\circ}C$. By a linear transformation of the lifespan data for each temperature, a constant value and activation energy coefficient was induced for the Arrhenius equation and verified by comparing the value of a lifetime prediction model with the experimental value at $85^{\circ}C$. The failure modes of the ongoing or finished test were leakage, bellows separation, and internal deformation. In the future, a composite lifespan prediction model, including two more stress factors, will be developed.

Keywords

Arrhenius model;Accelerated life test;Expansion joint;Lifespan prediction;Vibration reproducing

Acknowledgement

Supported by : 국토교통부

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