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Taylor 봉 충격시험을 통한 고 변형률속도하 금속재료의 동적변형거동 평가

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

  • 배경오 (안동대학교 기계설계공학과) ;
  • 신형섭 (안동대학교 기계설계공학과)
  • Bae, Kyung Oh (Dept. of Mechanical Design Engineering, Andong Nat'l Univ.) ;
  • Shin, Hyung Seop (Dept. of Mechanical Design Engineering, Andong Nat'l Univ.)
  • 투고 : 2016.02.02
  • 심사 : 2016.06.02
  • 발행 : 2016.09.01

초록

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.

키워드

테일러 봉 충격시험;고 변형률속도;동적항복강도;고속영상촬영 시스템

과제정보

연구 과제 주관 기관 : 안동대학교

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