Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Numerical and Experimental Verification of Stress Wave Control Effect in SHPB Experiment using Pulse Shaper

Pulse Shaper를 이용한 SHPB 실험 응력파 제어 효과의 해석 및 실험적 검증

  • Received : 2017.08.23
  • Accepted : 2017.09.12
  • Published : 2017.10.01
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Abstract

In the high-speed forming analysis, dynamic material properties considering a high strain rate are required. The split Hopkinson pressure bar (SHPB) experiment was performed for measuring dynamic material properties under high strain rate. The pulse shaping method was used to improve the accuracy of the SHPB experiment. A pulse shaper attached to the front of the incident bar was used for specimen dynamic stress equilibrium through stress wave control. Numerical analysis and SHPB test were performed to verify whether the pulse shaper affects the dynamic stress equilibrium in copper and Al6061 specimens. The results of SHPB test and numerical analysis show that the pulse shaper contributes to the dynamic stress equilibrium. Based on the improved stress equilibrium using a pulse shaper, the flow stress curves for copper and Al6061 materials were obtained at strain rates of 1344.4/sec and 1291.6/sec, respectively.

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References

  1. M. Seth, V. J. Vohnout, G. S Daehn, 2005, Formability of Steel Sheet in High Velocity Impact, J. Mater. Process. Technol., Vol. 168, No. 3, pp. 390-400. https://doi.org/10.1016/j.jmatprotec.2004.08.032
  2. B. Hopkinson, 1914, A Method of Measuring the Pressure Produced in the Detonation of Explosives or by the Impact of Bullets, Philos. Trans. R. Soc. London. Ser. A, Vol. 213, pp. 437-452. https://doi.org/10.1098/rsta.1914.0010
  3. H. Kolsky, 1963, Stress Wave in Solids, Brown University, Dover Publications, New York, pp. 87-91.
  4. K. T. Ramesh, 2008, High Strain Rate and Impact Experiments, The Johns Hopkins University, Springer US, pp. 929-960.
  5. W. Chen, B. Song, 2011, Split Hopkinson(Kolsky) bar Design, Testing and Applications, Springer US, pp. 50-62.
  6. W. J. An, W. M. Woo, H. G. Noh, B. S. Kang, J. Kim, 2016, Design and Fabrication of Split Hopkinson pressure bar for Acquisition of Dynamic Material property of Al6061-T6, J. Kor. Soc. Precis. Eng., Vol. 33, No. 7, pp. 587-594. https://doi.org/10.7736/KSPE.2016.33.7.587
  7. O. S. Lee, J. S. Park, 2011, Dynamic Deformation Behavior of Bovine Femur using SHPB, J. Mech. Sci. Technol., Vol. 25, No. 9, pp. 2211-2215. https://doi.org/10.1007/s12206-011-0602-x
  8. D. J. Frew, M. J. Forrestal, W. Chen, 2005, Pulse Shaping Techniques for Testing Elastic-plastic Materials with a Split Hopkinson Pressure bar, Exp. Mech., Vol. 45, No. 2, pp. 186-195. https://doi.org/10.1007/BF02428192
  9. O. S. Lee, Y. H. Han, S. H. Kim, 2005, Proc. Kor. Soc. Mech. Eng. Autumn Conf., Kor. Soc. Mech. Eng., Seoul, Korea, pp. 1527-1532.
  10. G. R. Johnson, W. H. Cook, 1985, Fracture Characteristics of Three Metals Subjected to Various Strains, Strain rates, Temperatures and Pressures, Eng. Fract. Mech., Vol. 21, No. 1, pp. 31-48. https://doi.org/10.1016/0013-7944(85)90052-9