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

The Korean Society of Mechanical Engineers (대한기계학회)
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Dynamic Behavior of SM45C at High Strain-rate and High Temperature

고온 고변형률속도에서 SM45C의 동적 거동

  • 양현모 (연세대학교 대학원 기계공학과) ;
  • 민옥기 (연세대학교 기계공학부)
  • Published : 2007.11.01

Abstract

A compressive split Hopkinson pressure bar (SHPB) technique is used to investigate the dynamic behavior of SM45C at high temperature. A radiant heater, which consists of one ellipsoidal reflector and one halogen lamp, is used to heat the specimen. Specimens are tested from $600^{\circ}C$ to $1000^{\circ}C$ at intervals of $100^{\circ}C$ at a strain-rate ranging from 1100/s to 1150/s. A critical phenomenon occurs between $700^{\circ}C$ and $750^{\circ}C$ in SM45C. This phenomenon results in the drastic drop in a flow stress. In a modified Johnson-Cook constitutive equation, a reducer function is used to take into account for the effect of the drastic drop in a flow stress. A reducer function, which is dependant on the temperature as well as the strain, is introduced and the parameters of the modified Johnson-Cook constitutive equation are determined from test results.

Keywords

Dynamic Behavior;SHPB;High Strain-rate

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References

  1. Kolsky H., 1949, 'An Investigation of the Mechanical Properties of Materials very High Rates of Loadings,' Proc. Phys. Soc.(London), B63, pp. 676-700
  2. Chiddister JL, Malvern LE, 1963, 'Compression-Impact Testing of Aluminum at Elevated Temperature,' Exp. Mech., Vol.3, pp. 81-90 https://doi.org/10.1007/BF02325890
  3. Follansbee P.S., 1985, 'The Hopkinson bar,' ASM handbook $9^{th}$ Ed., ASM international, Vol. 8, pp. 198-203
  4. Ingyu Lee, Hyunmo Yang, Oakkey Min, 2006, 'Dynamic Behavior of Aluminum 2024-T4 at High Temperature,' Proceedings of the KSME 2006 spring Annual Meeting, Jejodo, Korea
  5. Songwon Seo, Oakkey Min, Hyunmo Yang, 2005, 'Constitutive Equation for Ti-6Al-4V at High Temperatures Measured Using the SHPB Technique,' Int. J. impact Eng., Vol. 31, pp. 735 - 754 https://doi.org/10.1016/j.ijimpeng.2004.04.010
  6. G. R. Johnson, W. H. Cook, 1983, Proc. $7^{th$ Intern. Symp. Ballastics, Am. Def. Prep. Org, Netherlands
  7. J. R. Davis, 1998, 'Metals Handbook Desk Edition,' ASM International, $2^{nd}$ Ed
  8. Macdougall D. A., Harding J., 1998, 'The Measurement of Specimen Surface Temperature in High-speed Tension and Torsion Test,' Int. J. impact Eng., Vol. 21, pp. 473-478 https://doi.org/10.1016/S0734-743X(98)00007-4
  9. M. A. Meyers, 1994, 'Dynamic Behavior of Materials,' John Wiley & Sons
  10. U. R. Andrade, M. A. Meyer, K. S. Vecchio, A. H. Chokshi, 1994, 'Dynamic Recrystallization in High-Strain, High-Strain-Rate Plastic Deformation of Copper,' Acta. Metall. Mater., Vol. 42, pp. 3183 - 3195 https://doi.org/10.1016/0956-7151(94)90417-0

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