Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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A Study of the Characteristic of Friction Coefficient Variation for the External Environment

외부환경에 따른 마찰재의 마찰계수 변화 특성에 대한 연구

  • Received : 2015.03.02
  • Accepted : 2015.06.19
  • Published : 2015.11.01
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Abstract

The friction material for automobile is manufactured by mixing several composites to stop the running vehicles. Friction characteristics are changed significantly according to the relative amount of the base materials. However, difference of friction coefficient is sometimes measured at the test for the same friction material. Nevertheless, the study for solving these problems is insufficient. In this paper, the friction tests were carried out by changing the external environment and processing condition when the main ingredients are fixed and also evaluated how the friction coefficient changes. The variables are cooling air speed, humidity (Relative humidity and Absolute humidity), scorching time, soaking time and pad area. And it is analytically considered which environmental factor mainly affects the characteristic of friction coefficient variation by experiment. It is expected that the results from this study can be very useful as a database for development of the friction material.

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References

  1. M. G. Jacko, "Physical & Chemical Changes of Organic of Disc Pads in Service," Wear, Vol.46, No.1, pp.163-175, 1978. https://doi.org/10.1016/0043-1648(78)90118-7
  2. K. W. Suh, "Field Correlation for the Wear Life of Brake Pad," KSAE Spring Conference Proceedings, pp.1002-1006, 2002.
  3. J. T. Park, S. W. Han and N. S. Choi, "Robust Design of the Back-plate Shape of the Disc Brake Pad for Reduction of Uneven Wear," Transactions of KSAE, Vol.22, No.1, pp.8-19, 2014.
  4. J. A. Willians, Engineering Tribology, Oxford University Press, London, 1994.
  5. J. H. Park, T. W. Park, J. H. Lee and M. H. Cho, "Hot Judder Simulation of a Ventilated Disc and Design of an Improved Disc Using Sensitivity Analysis," Int. J. Automotive Technology, Vol.15, No.1, pp.1-6, 2014. https://doi.org/10.1007/s12239-014-0001-2
  6. Y. K. Chang and J. R. Hwang, "Numerical Model for Prediction of Brake Judder due to Wear and Rust," Int. J. Automotive Technology, Vol.14, No.3, pp.375-384, 2013. https://doi.org/10.1007/s12239-013-0041-z
  7. G. H. Lee, Variation of Friction Cofficient & D.T.V. for Base Fibers in Automotive Friction Material, M. S. Thesis, Chungbuk National University, Chungbuk, Korea, 2001.
  8. T. Yeo, "A Study on Wear Life Prediction of Disk Brake Pads," Transactions of KSAE, Vol.10, No.4, pp.199-205, 2002.
  9. D. Antanaitis, "The Effect of Racetrack/High Energy Driving on Brake Caliper Performance," SAE 2009-01-3027, 2009.
  10. M. Unno, M. Inoue and Y. Hara, "Decrease of Friction Coefficient of Disc Pads during Low G Braking after Continuous High G Braking," SAE 2005-01-3938, 2005.
  11. R. Cross, "Increase in Friction Force with Sliding Speed," Am. J. Phys., Vol.73, No.9, pp.812-816, 2005. https://doi.org/10.1119/1.1891174
  12. G. H. Lee, K. H. Kang and D. K. Lee, "Characteristics of Aggression and Brake Judder by Different $ZrSiO_4$ Particle Size," Transactions of KSAE, Vol.22, No.7, pp.144-151, 2014. https://doi.org/10.7467/KSAE.2014.22.7.144

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