Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Dynamic Material Property of the Sinter-Forged Cu-Cr Alloys with the Variation of Chrome Content

구리-크롬 소결단조 합금의 크롬 함유량 변화에 따른 동적 물성특성

  • 송정한 (한국과학기술원 기계공학과) ;
  • 허훈 (한국과학기술원 기계공학과)
  • Published : 2006.06.01
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Abstract

Vacuum interrupters are used in various switch-gear components such as circuit breakers, distribution switches, contactors. The electrodes of a vacuum interrupter are manufactured of sinter-forged Cu-Cr material for good electrical and mechanical characteristics. Since the closing velocity is 1-2m/s and impact deformation of the electrode depends on the strain-rate at the given velocity, the dynamic material property of the sinter-forged Cu-Cr alloy is important to design the vacuum interrupter reliably and to identify the impact characteristics of a vacuum interrupter accurately. This paper is concerned with the dynamic material properties of sinter-forged Cu-Cr alloy for various strain rates. The amount of chrome is varied from 10 wt% to 30 wt% in order to investigate the influence of the chrome content on the dynamic material property. The high speed tensile test machine is utilized in order to identify the dynamic property of the Cu-Cr alloy at the intermediate strain-rate and the split Hopkinson pressure bar is used at the high strain-rate. Experimental results from both the quasi-static and the high strain-rate up to the 5000/sec are interpolated with respect to the amount of chrome in order to construct the Johnson-Cook and the modified Johnson-Cook model as the constitutive relation that should be applied to numerical simulation of the impact behavior of electrodes.

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References

  1. Barkan, P., 1966, 'A Study of the Contact Bounce Phenomenon,' IEEE Transactions on Power Apparatus an Systems, Vol. 86, No. 2, pp. 231-240
  2. Shi, N. F. and Meuleman, D. J., 1992, 'Strain Rate Sensitivity of Automotive Steels,' Proceedings of SAE International Congress Exposition, Detroit, 922045
  3. Jukas, J. A., Nicholas, T., Swift, R. F., Greszczuk, L. B. and Curran, D. R., 1982, Impact Dynamics, John Wiley & Sons, New York
  4. Johnson, G. R. and Cook, W. R., 1985, 'Fracture Characteristics of Three Metals Subjected to Various Strains, Strain Rates Temperatures and Pressure' Eng. Frac. Mech., Vol. 21, pp. 541-547 https://doi.org/10.1016/0013-7944(85)90052-9
  5. Huh, H. and Lim, J. H., 2002, 'High Strain-Rate Test of Sinter-Forged Cu-Cr with Split Hopkinson Pressure Bar,' Proceedings of Plasticity 2002, pp. 645-647
  6. Lim, J. H., Song, J. H., Huh, H., Park, W. J., Oh, I. S., Ahn, G. Y. and Choe, J. W, 2002, 'Parameter Study of Impact Characteristics for a Vacuum Interrupter Considering Dynamic Material Properties,' Trans. Of KSME(A), Vol. 26, No. 5, pp. 924-931 https://doi.org/10.3795/KSME-A.2002.26.5.924
  7. Huh, H., Lim, J. H., Kim, S. B., Han, S. S. and Park, S. R., 2004, 'Formability of the Steel Sheet at the Intermediate Strain Rate', Key Eng. Mater., Vols. 274-276, pp.403-408 https://doi.org/10.4028/www.scientific.net/KEM.274-276.403
  8. Kolsky, H., 1963, Stress Waves in Solids, Dover publications, New York, pp. 41-98
  9. Meyers, M. A., 1994, Dynamic Behavior of materials, John Wiley & Sons, New York
  10. Kang, W. J., Cho, S. S., Huh R. and Chung, D. T., 1999, 'Modified Johnson-Cook Model for Vehicle Body Crashworthiness Simulation,' Int. J. Vehicle Design, Vol. 21, pp. 424-435 https://doi.org/10.1504/IJVD.1999.005594