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Evaluation of Dynamic Deformation Behaviors in Metallic Materials under High Strain-Rates Using Taylor Bar Impact Test

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)
  • Received : 2016.02.02
  • 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.

최근 기계 시스템의 고속화가 진행됨에 따라 구조물 및 기계부품의 신뢰성 및 안전성 확보 측면에서, 충격하중하에서 구조용 재료의 동적변형거동에 대한 평가가 필요하다. 그러나 $10^4\;s^{-1}$를 넘는 고 변형률속도에서 실험적 기법을 사용한 구조용 재료의 변형거동의 파악은 용이하지 않은 실정이다. 본 연구에서는, 고 변형률속도역에서 금속재료의 동적변형거동을 조사하기 위해 Taylor 봉 충격시험을 실시하였다. 또한 고속영상촬영 시스템을 사용하여 Taylor 봉 충격시험 동안 변형거동을 관찰하였다. Taylor 봉 충격시, 경과시간에 따른 변형과정을 AUTODYN 상용 S/W를 사용한 수치해석을 수행하여 실험결과와 비교하여 고 변형률속도역에서 거동을 평가하였다.

Keywords

References

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