# Taylor 봉 충격시험을 통한 고 변형률속도하 금속재료의 동적변형거동 평가

• Bae, Kyung Oh (Dept. of Mechanical Design Engineering, Andong Nat'l Univ.) ;
• Shin, Hyung Seop (Dept. of Mechanical Design Engineering, Andong Nat'l Univ.)
• 배경오 (안동대학교 기계설계공학과) ;
• 신형섭 (안동대학교 기계설계공학과)
• Accepted : 2016.06.02
• Published : 2016.09.01

#### Abstract

To ensure the reliability and safety of various mechanical systems in accordance with their high-speed usage, it is necessary to evaluate the dynamic deformation behavior of structural materials under impact load. However, it is not easy to understand the dynamic deformation behavior of the structural materials using experimental methods in the high strain-rate range exceeding $10^4\;s^{-1}$. In this study, the Taylor bar impact test was conducted to investigate the dynamic deformation behavior of metallic materials in the high strain-rate region, using a high-speed photography system. Numerical analysis of the Taylor bar impact test was performed using AUTODYN S/W. The results of the analysis were compared with the experimental results, and the material behavior in the high strain-rate region was discussed.

#### Acknowledgement

Supported by : 안동대학교

#### References

1. Meyer, M. A., 1994, Dynamic Behavior of Material, New York, John Wiley & Sons, pp. 81-97.
2. Cowper, G. R. and Symonds, P. S., 1957, "Strain-hardening and Strain-rate Effects in the Impact Loading of Cantilever Beams," No. TR-C11-28, Brown Univ Providence Ri.
3. Johnson, G. R. and Cook, W. H., 1983, "A Constitutive Model and Data for Metals Subjected to Large Strain, High Strain Rate and High Temperatures," Proceedings of the 7th International Symposium on Ballistics, Vol. 21, pp. 541-547.
4. Zerilli, F. J. and Armstrong, R. W., 1987, "Dislocation-mechanics-based Constitutive Relations for Material Dynamics Calculations," Journal of Applied Physics, Vol. 61, No. 5, pp. 1816-1825. https://doi.org/10.1063/1.338024
5. Khan, A. S. and Huang, S., 1992, "Experimental and Theoretical Study of Mechanical Behavior of 1100 Aluminum in the Strain Rate Range $10^{-5}{\sim}10^4\;s^{-1}$," International Journal of Plasticity, Vol. 8, No. 4, pp. 397-424. https://doi.org/10.1016/0749-6419(92)90057-J
6. Kang, W. J., Cho, S. S., Huh, H. and Chung, D. T., 1999, "Modified Johnson-Cook Model for Vehicle Body Crashworthiness Simulation," International Journal of Vehicle Design, Vol. 21, No. 4-5, pp. 424-435. https://doi.org/10.1504/IJVD.1999.005594
7. Taylor, G., 1948, "The Use of Flat-ended Projectiles for Determining Dynamic Yield Stress," In Proceedings of the Royal Society of London A: Mathematical, Physical and Engineering Science. The Royal Society, Vol. 194, No. 1038, pp. 289-299.
8. Anderson Jr, C. E., Nicholls, A. E., Chocron, I. S. and Ryckman, R. A., 2006, July, "Taylor Anvil Impact," In SHOCK COMPRESSION OF CONDENSED MATTER-2005: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter, Vol. 845, No. 1, pp. 1367-1370, AIP Publishing.
9. Sarva, S., Mulliken, A. D. and Boyce, M. C., 2007, "Mechanics of Taylor Impact Testing of Polycarbonate," International Journal of Solids and Structures, Vol. 44, No. 7, pp. 2381-2400. https://doi.org/10.1016/j.ijsolstr.2006.07.012
10. Shin, H. S., Park, S. T., Kim, S. J., Choi, J. H. and Kim, J. T., 2008, "Deformation Behavior of Polymer Materials by Taylor Impact," International Journal of Modern Physics B, Vol. 22, pp. 1235-1242. https://doi.org/10.1142/S0217979208046591
11. Allen, D. J., Rule, W. K. and Jones, S. E., 1997, "Optimizing Material Strength Constants Numerically Extracted from Taylor Impact Data," Experimental Mechanics, Vol. 37, No. 3, pp. 333-338. https://doi.org/10.1007/BF02317427
12. Lee, M. H. and Chung, W. J., 2006, "Development of 3-Dim Simplified ALE Hydrocode: Application to Taylor Impact Test," Trans. Korean Soc. Mech. Eng. A, Vol. 30, No.10, pp. 1235-1241. https://doi.org/10.3795/KSME-A.2006.30.10.1235
13. Eakins, D. E. and Thadhani, N. N., 2007, "Analysis of Dynamic Mechanical Behavior in Reverse Taylor anvil-on-rod Impact Tests," International Journal of Impact Engineering, Vol. 34, No. 11, pp. 1821-1834. https://doi.org/10.1016/j.ijimpeng.2006.11.001
14. Millett, J. C. F., Bourne, N. K. and Stevens, G. S. 2006, "Taylor Impact of Polyether Ether Ketone," International Journal of Impact Engineering, Vol. 32, No. 7, pp. 1086-1094. https://doi.org/10.1016/j.ijimpeng.2004.09.008
15. Wilkins, M. L. and Guinan, M. W., 1973, "Impact of Cylinders on a Rigid Boundary," Journal of Applied Physics, Vol. 43, No. 3, pp. 1200-1206.
16. AUTODYN Explicit Software for Nonlinear Dynamics, 2005, Theory Manual, Revision 4.3.