# 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
• 30 4

#### 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

#### References

1. J. H. Lee, H. W. Suh, "Design of a Plant Life Cycle Data Management System for Plant Operation and Maintenance", Journal of Korean Institute of Industrial Engineers, Vol.42, No.3, pp.241-248, 2016. DOI: https://dx.doi.org/10.7232/JKIIE.2016.42.3.241 https://doi.org/10.7232/JKIIE.2016.42.3.241
2. H. Lim, B. Cho, Y. Kim, H. Lee, J. Kim, "A Study on Accelerated Life Evaluation Method of Component for Automatic Transmission", Transaction of the Korean Society of Automotive Engineers, Vol.25, No.2, pp.250-256, 2017. DOI: https://dx.doi.org/10.7467/KSAE.2017.25.2.250 https://doi.org/10.7467/KSAE.2017.25.2.250
3. G. S. Yu, N. R. Lee, Y. H. Yeo, B. C. Lee, "Accelerated Life Prediction of the Rubber for Combat Boots", Journal of the Korea Academia-Industrial cooperation Society, Vol.16, No.12, pp.8637-8642, 2015. DOI: https://dx.doi.org/10.5762/KAIS.2015.16.12.8637 https://doi.org/10.5762/KAIS.2015.16.12.8637
4. K. S. Kim, J. H. Lee, M. C. Kang, "Life Prediction of Hydraulic Piston Pump for Light Rescue Vehicle through Accelerated Life Testing", Proceedings of Fall Conference of The Korea Fluid Power Systems Society, pp.187-190, 2017.
5. J. S. Oh, S. H. Cho, "A Study for Lifetime Prediction of Expansion Joint Using HILS", Korea Academy-Industrial Cooperation Society, Journal of the Korea Academia-Industrial cooperation Society, Vol.19, No.4, pp.138-142, 2018. DOI: https://dx.doi.org/10.5762/KAIS.2018.19.4.138
6. J. S. Oh, D. K. Kang, J. S. Heo, "Development of HIL Simulator for Vibration Reproducing of Waterhammer", Korea Academy Industrial Cooperation Society, Fall Conference, pp.325-326, 2017.