Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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Evaluation of the Aging Life of the Rubber Pad in Power Window Switch

  • Kang, Yong Kyu (Department of Nano-Mechatronics, University of Science and Technology) ;
  • Choi, Byung Ik (Division of Nano-Convergence Mechanical Systems) ;
  • Woo, Chang Su (Division of Nano-Convergence Mechanical Systems) ;
  • Kim, Wan Doo (Department of Nature-Inspired Nanoconvergence Systems, Korea Institute of Machinery & Materials)
  • Received : 2019.11.28
  • Accepted : 2019.12.11
  • Published : 2019.12.31
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Abstract

To evaluate the aging of a rubber pad in power window switch which is the part of a vehicle, the accelerated thermal aging test of rubber pad material is performed. Finite element analysis was performed using the nonlinear material constants of the rubber pad to calculate the operating force, and the Arrhenius relationship was derived from the aging temperature and time. The aging test was performed at 150, 180, 210, or 240 ℃ for 1 to 60 days. When the operating force of the rubber pad is changed by 10% from the initial value, the service life is expected to be 113 years, which is much longer than the life of the vehicle. This indicates that the aging life of the rubber pad is sufficiently safe and the operating force of the rubber pad during the life of the vehicle (20 years) was decreased by approximately 8.4%. By examining the correlation between the shear elastic modulus and operating force calculated from finite element analysis under each aging test condition, the changes in the operating force of the rubber pad and the shear elastic modulus showed good linear relationship. The aging life could be predicted by the change in shear elastic modulus and a process for predicting the aging life of automotive power window switch rubber pad parts is described herein.

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References

  1. Y. G. Moon, M. R. Kim, and D. W. Yang, "Quantitative Study of the Perceived Quality for Automobile Interior Function Parts", Spring Conference of the Korean Society of Automotive Engineers, 625 (2016).
  2. Wan-doo Kim, Hak-ju Lee, and Chang-su Woo et al., "Development of Integrated Design System for Mechanical Rubber Components", Ministry of Science and Technology, 22 (2000).
  3. Wan-doo Kim, Chang-su Woo, and Seung-woo Han et al., "Design and Analysis of the Hyper-elastic Rubber Mechanical Components", Ministry of Science and Technology, 12 (1997).
  4. Wan-doo Kim, Wan-soo Kim, Dong-jin Kim, Chang-su Woo, and Hak-ju Lee, "Mechanical Testing and Nonlinear Material Properties for Finite Element Analysis of Rubber Components", Journal of Mechanical Science and Technology, A 28, 848 (2004).
  5. Wan-doo Kim, Wan-soo Kim, Chang-su Woo, and Sang-jun Cho, "Prediction of Useful Life by Heat Aging of Motor Fan Isolating Rubber", Elastomers and Composites, 37, 107 (2002).
  6. Gyoo-Shick Jeon, Kwang-Tae Roh, and Bum-Youl Beak, "A Study on the Vertical Deflection of the Rubber Bearing", Journal of the Korean Society for Railway, 10, 553 (2015).
  7. R. P. Brown, T. Butler, and S. W. Hawley, "Ageing of Rubber - Accelerated Heat Ageing Test Results", Rapra Technology Limited, 111 (2001).
  8. Jin-Hyok Lee, Jong-Woo Bae, Yu-Mi Yoon, Myung-Chan Choi, and Nam-ju Jo, "Predicting the Life-time of Fluoro-Silicon O-rings Using Intermittent Compression Stress Relaxation(CSR) Techniques", Journal of the Korean Society of Propulsion Engineers, 12, 231 (2016).